401 results about "Ortho position" patented technology

The invention discloses a tetranuclear ladder type organic tin carboxylate complex as well as a preparation method and application thereof, and belongs to the technical field of metal complexes, the tetranuclear ladder type organic tin carboxylate complex is prepared by taking para-position or ortho-position substituted benzoic acid as a ligand and taking organic tin dimethyl tin oxide as a substrate. The preparation method is simple to operate and mild in condition. The tetranuclear ladder type organic tin carboxylate complex can be used as a photocatalyst for photocatalytic production of H2O2, and the photocatalytic H2O2 production rate is as high as 5.12 * 10 < 3 > [mu] mol.g <-1 >. H <-1 > and is higher than the H2O2 production rate of a photocatalyst reported in the existing literature.

The invention relates to a catalyst for synthesizing ortho-cresol as well as a preparation method and application of the catalyst. The molar ratio of Zn element to Al element in the metal spinel catalyst ZnAl2O4 is 1: (0.25-16), and the preparation method comprises the following steps: uniformly mixing aluminum nitrate nonahydrate and zinc nitrate hexahydrate in deionized water, stirring, adding a precipitator, and adjusting the pH value of the solution to form a precipitate dispersion liquid; and aging the precipitate dispersion liquid, carrying out suction filtration on the suspension liquid, washing, drying, and calcining to obtain the catalyst. Compared with the prior art, the catalyst disclosed by the invention is high in activity, simple to prepare, non-toxic, good in stability, long in service life, suitable for synthesizing o-cresol and 2, 6-xylenol through reaction of phenol and methanol, good in ortho-selectivity and few in by-products.

The invention discloses a COF (Covalent Organic Framework) photocatalyst based on accurate regulation and control of benzene ring nitrogen sites as well as a preparation method and application thereof, and belongs to the technical field of COF materials. According to the preparation method, toxic reagents are not needed, high repeatability of a COF structure is achieved by accurately controlling monomer substitution positions, photocatalytic activity and stability in an acid environment are remarkably improved by designing ortho-N-substituted, meta-N-substituted and para-N-substituted COF materials, especially the photocatalytic hydrogen peroxide production rate of ortho-N-substituted oN-COF reaches 3015 [mu] mol.g <-1 >. H <-1 >, and the photocatalytic activity and stability in the acid environment are remarkably improved. The activity is obviously higher than that in the prior art (1.8 mmol.g <-1 >. H <-1 >, namely 1800 mu mol.g <-1 >. H <-1 > reported by Zhang and the like), and the activity is kept 92% after five times of circulation. The process is green and environment-friendly, and is suitable for large-scale production.

The invention discloses an industrial preparation method of ortho-position large-steric-hindrance aniline, which comprises the following steps: reacting 2, 4-disubstituted aniline with benzhydrol or a derivative thereof, and performing simple post-treatment on the reaction product to obtain the ortho-position large-steric-hindrance aniline product. The method effectively solves the problem of difficulty in large-scale industrial preparation in the prior art, and has the advantages of mild reaction conditions, simplicity in operation, high efficiency and good effect.

To provide a novel compound suitable as a material for organic devices such as an organic electroluminescent device.SOLUTION: An polycyclic aromatic compound has a structure composed of one or more structural units represented by formula (1), including at least one group represented by formula (X1). (A ring-D ring, and F ring are each an aryl ring or heteroaryl ring; Y is >B-; Rbz is an ortho-substituted phenyl; the other X are each a group represented by formula (X2) or >N-ArX or the like; D ring may be further bonded to the ring to which the group represented by formula (X1) is bonded via the linking group LD. At least one selected from the group consisting of aryl rings and heteroaryl rings in the above structure may be fused with at least one cycloalkane).SELECTED DRAWING: None

Provided in the present invention are an epoxy resin composition for single-component liquid molding and a preparation method therefor. Said resin composition comprises the following components in percentage by weight: 7-35% of a tetrafunctional epoxy resin, 16-40% of a trifunctional epoxy resin, 7-21% of a bifunctional epoxy resin, 1-6% of a toughening agent and 34-40% of a low-activity curing agent, the toughening agent being a thermoplastic resin, the low-activity curing agent being an aromatic amine curing agent into which a chlorine electron-withdrawing group is introduced to the ortho-position or para-position of an amino group, and the ratio of the mole number of the low-activity curing agent to the total mole number of all the epoxy resins being (88-110):100. The present invention uses the aromatic amine curing agent containing a chlorine electron-withdrawing group for lowering the curing reaction activity of the epoxy resin composition, thereby prolonging the operable time of the single-component liquid molding resin system and achieving a relatively wide process operation window. Said epoxy resin composition is suitable for manufacturing composite material primary load-bearing structures in civil aviation by means of automated dry fiber placement-liquid molding technology.

The invention provides a naphthalimide compound as well as a preparation method and application thereof, and belongs to the technical field of organic compounds. N-(4-tert-butylphenyl) naphthalimide is used as an acceptor unit (a group A), 9, 9-dimethyl acridine, 9, 9-diphenyl acridine, phenoxazine, phenothiazine, 7H-benzo [c] carbazole or 9H-dibenzo [a, c] carbazole is used as an electron donor unit (a group D), and the donor unit and the acceptor unit are connected through ortho-positions or meta-positions of benzene bridges or derivatives thereof; the formation of the 3CT state depends on the CT effect between the D group and the A group, the specific D group and the benzene bridge unit are selected to control the distance and the dihedral angle between the D unit and the A unit so as to realize the regulation and control of the service life of the 3CT state, and meanwhile, the fine adjustment of the energy of the 3CT state is realized by virtue of the substituent group on the benzene bridge unit, so that the service life of the 3CT state is prolonged. Therefore, the naphthalimide compound has a long charge transfer triplet state lifetime in a single molecule state.

The invention discloses an ortho-thiol modified triphenylene carboxylic acid ligand, an MS2O2 site-containing metal organic framework material as well as a preparation method and application of the ortho-thiol modified triphenylene carboxylic acid ligand and the MS2O2 site-containing metal organic framework material. The ligand has a triphenylene main body pi conjugated structure and ortho-position modified carboxyl and thiol groups, and is coordinated with metal ions through solvothermal reaction, and the bond length of an S-M bond formed by coordination is shorter than that of an O-M bond formed by coordination of the carboxyl and the metal ions, so that d-pi conjugation of the coordinated metal ions and the pi conjugated organic ligand is enhanced, and the metal ions and the pi conjugated organic ligand are combined to form the pi conjugated organic ligand. The electron conduction rate in the metal organic framework material is favorably improved, so that the reaction activity of the metal organic framework material is further improved. Especially, the photocatalytic hydrogen evolution rate (HER) can reach 4126.01 [mu] mol g <-1 > h <-1 > by taking Co as a coordination metal ion material, and the material has excellent photocatalytic hydrogen evolution activity. The metal organic framework material can be produced and prepared through solvothermal reaction, the preparation process is mature, the steps are simple, the yield is high, and large-scale preparation can be achieved.

The invention provides a preparation method of a chlorantraniliprole key intermediate 2-amino-5-cyano-N, 3-dimethyl benzamide, which comprises the following steps: taking cheap and easily available o-methylaniline as a raw material, acylating an aniline substrate through Boc anhydride, carrying out ortho-lithiation on n-butyllithium, introducing carbon dioxide gas, and carrying out acid hydrolysis to obtain 2-amino-3-methyl benzoic acid, thereby obtaining the chlorantraniliprole key intermediate 2-amino-5-cyano-N, 3-dimethyl benzamide. The preparation method comprises the following steps: firstly, preparing an isatoic anhydride intermediate, then carrying out triphosgene ring closing to obtain an isatoic anhydride intermediate, carrying out bromine para-position halogenation, carrying out cuprous cyanide high-temperature Rosenmn-von Braun reaction, and finally carrying out methylamine ring opening to obtain the target product 2-amino-5-cyano-N, 3-dimethylbenzamide, and although the route is long, the yield is high, the continuity is good, few industrial three wastes are generated, and the cost is lower, so that the preparation method has great industrial production value.

The embodiment of the invention provides a preparation method of methylene-bridged substituted phenol substituted by hydroxyl ortho-hydroxymethyl, and the preparation method comprises the following steps: A1, reacting substituted phenol with formaldehyde in the presence of a Lewis acid catalyst to prepare a substituted salicylaldehyde compound (2); a2, carrying out condensation reaction on the substituted salicylaldehyde compound (2) in a system containing formaldehyde and a Bronsted acid catalyst to prepare a methylene-bridged substituted salicylaldehyde compound (3); and A3, reducing the methylene-bridged substituted salicylaldehyde compound (3) to prepare methylene-bridged substituted phenol (4) with hydroxyl ortho-hydroxymethyl substituted. According to the embodiment of the invention, the yield and the chemical purity of the prepared methylene-bridged substituted phenol substituted by hydroxyl ortho-hydroxymethyl can be improved. According to other embodiments of the invention, the invention also provides a preparation method of the polyphenol compound containing multiple phenol units.

To provide camptothecin compounds and their conjugates with novel structures, improved efficacy and improved safety.SOLUTION: The present invention provides a compound having the structure of the upper formula in the figure, or a pharmaceutically acceptable salt, ester, stereoisomer, polymorph, solvate, nitrogen oxide, isotope-labeled product, metabolite or prodrug thereof. In the formula, R1 and R2 are each hydrogen, halogen, C1-6 alkyl, C1-6 alkoxyl, or the like, or are connected with adjacent carbon atoms to form a 5- to 6-membered oxygen-containing heterocyclic ring; R3 is hydrogen or is connected with an ortho-carbon atom of R1 to form a 6-membered carbocyclic ring; and A is selected from one of the lower two formulas in the figure.SELECTED DRAWING: None

The invention provides a phenylalkylfluorene-substituted naphthalene ring arylamine compound and a preparation method and application thereof, and belongs to the field of organic electroluminescent materials, the phenylalkylfluorene-substituted naphthalene ring arylamine compound has a structure as shown in a formula 1 or a formula 2, the parent nucleus of the compound is that arylamine and a 9-alkyl-9-phenylfluorenyl derivative group are subjected to ortho-position substitution in the same aromatic ring of a naphthalene ring, the naphthalene ring has a relatively strong pi conjugation effect and a relatively large delocalization area, and naphthyl is more favorable for increasing the distribution of holes in molecules and enhancing the hole transmission capability of the material; the ortho-position connection steric hindrance of the naphthalene ring and the aromatic ring as shown in the invention is proper, so that the intermolecular interaction is weakened, and the compound has the characteristics of difficulty in intermolecular crystallization, difficulty in aggregation and good film-forming property, has high glass transition temperature and thermal stability, and prolongs the service life of an OLED (Organic Light Emitting Diode) device; and the efficiency can be improved by the introduced sp3 hybrid functional group of the 9-alkyl-9-phenylfluorenyl derivative.

Crosslinking aromatic compounds are described which have structure (I). Also described, are compositions including these crosslinking compounds, for instance ones which also comprising a photoacid generator. Also, described are methods of using such compositions to coat a substrate and by exposing it to radiation producing an image which may be used as a mask in the manufacture of microelectronics. Also disclosed is a selective iodination method for multiphenolic compounds at the ortho position to the phenol functionality, employing a 1-iodopyrrolidine-2,5-dione moiety in the presence of an arylsulfonic acid which produces the phenolic precursors of crosslinking aromatic compounds with selective iodination.

To provide camptothecin compounds and their conjugates with novel structures, improved efficacy and improved safety.SOLUTION: The present invention provides a compound having the structure of the upper formula in the figure, or a pharmaceutically acceptable salt, ester, stereoisomer, polymorph, solvate, nitrogen oxide, isotope-labeled product, metabolite or prodrug thereof. In the formula, R1 and R2 are each hydrogen, halogen, C1-6 alkyl, C1-6 alkoxyl, or the like, or are connected with adjacent carbon atoms to form a 5- to 6-membered oxygen-containing heterocyclic ring; R3 is hydrogen or is connected with an ortho-carbon atom of R1 to form a 6-membered carbocyclic ring; and A is selected from one of the lower two formulas in the figure.SELECTED DRAWING: None

The invention discloses a method for detecting related substances in imaric acid dihydrochloride by HPLC (High Performance Liquid Chromatography), and belongs to the technical field of chemical engineering and pharmacy, the related substances in the imaric acid dihydrochloride are detected by high performance liquid chromatography, a phosphate buffer solution (0.05 mol / L of monopotassium phosphate solution, and pH adjusted to 2.5 by phosphoric acid) is used as a mobile phase A, acetonitrile is used as a mobile phase B, gradient elution is carried out, the flow rate is 1.0 ml / min, the detection wavelength is 250nm, and the detection wavelength is 250nm. The column temperature is 40 DEG C, and the detection wavelength is 235nm; the method can be used for effectively separating and quantitatively detecting imatamide, demethylated imaric acid dihydrochloride, ortho-imaric acid, meta-imaric acid, p-hydroxymethyl benzamide, an intermediate B, p-hydroxymethyl benzoic acid, an imaric acid dimer, p-cyanobenzyl alcohol, p-chloromethyl benzamide, p-toluic acid and p-chloromethyl benzoic acid in the imaric acid dihydrochloride. The method disclosed by the invention is simple and convenient to operate, strong in specificity, high in sensitivity and accuracy, good in linearity and capable of effectively controlling the quality of a p-imaric acid dihydrochloride product.

The invention discloses a column [n] arene benzoquinone oxime ortho-position functionalized derivative and a preparation method thereof, and particularly relates to a preparation method for obtaining the column [n] arene benzoquinone oxime ortho-position functionalized derivative by reacting column [n] arene [1] benzoquinone oxime with a Grignard reagent. In the structure of column [n] arene [1] benzoquinone oxime, when alpha, beta-unsaturated ketone and a Grignard reagent are subjected to nucleophilic addition reaction, a 1, 4-addition product with high yield can be obtained, and no 1, 2-addition product exists. The method is mainly characterized in that protons can be removed from hydroxyl of oxime in column [n] arene [1] benzoquinone oxime under an alkaline condition, and oxygen negative ions of the hydroxyl are combined with positively charged metal magnesium atoms in a Grignard reagent to form a six-membered ring transition state, so that R negative ions can attack a No.4 carbon atom of alpha, beta-unsaturated ketone, and a 1, 4-addition reaction is carried out. The preparation method disclosed by the invention is mild in condition and can be carried out without harsh reaction conditions.

The invention relates to the technical field of catalytic synthesis, in particular to a chloromethylation catalyst, a preparation method of the chloromethylation catalyst and a method for preparing high-purity ortho-position, meta-position and para-position chloromethyl styrene through the chloromethylation catalyst, and the chloromethylation catalyst is prepared by loading sulfonic acid compounds and (or) pyridine compounds and (or) copper salt on a molecular sieve. The method can improve the localization selectivity of chloromethylation. The method for preparing high-purity ortho-position, meta-position and para-position chloromethyl styrene comprises the following steps of: reacting beta-bromophenylethane, paraformaldehyde and lewis acid in the presence of the chloromethylation catalyst to generate chloromethyl beta-bromophenylethane, and then performing elimination reaction under an alkaline condition to generate a chloromethyl styrene crude product; the high-purity ortho-position, meta-position and para-position chloromethyl styrene is obtained after the crude product is rectified, the brand-new catalyst is adopted in the method, the reaction selectivity is enhanced, the process is simple, and industrial production is facilitated.

The present invention provides a preparation method of benzopyrone. The preparation method includes: step S1, using trifluoronitrobenzene as the first raw material, performing ortho-substitution reaction with nitromethane to obtain 1,2-difluoro-4-nitro-3-nitromethylenebenzene, and performing para-substitution reaction with alkoxide to obtain a first intermediate; step S2, subjecting the first intermediate to a Nef reaction, converting the nitromethyl group to a carboxyl group to obtain a second intermediate; step S3, subjecting the second intermediate to a reduction reaction, an oxidation reaction, and a denitrogenation rearrangement reaction to convert the nitro group to an aldehyde hydrazine to obtain an aldehyde hydrazine intermediate; step S4, under the action of a catalyst, subjecting the aldehyde hydrazine intermediate to a nucleophilic addition reaction with the second raw material to generate a secondary alcohol intermediate, and subjecting the secondary alcohol intermediate to a ring-closing reaction to obtain a target product. The above-mentioned method for preparing benzopyrone has a wide range of raw material sources, relatively mild reaction conditions, and a high overall reaction yield.

The present invention provides a magnetic metal-polyphenol network material based on β-cyclodextrin and a preparation method and application thereof, belonging to the technical field of magnetic metal-polyphenol network material preparation method. The method obtains dopamine-derived cyclodextrin by substitution reaction; prepares magnetic nanoparticles by solvothermal method; 4+ The coordination between them forms a metal-polyphenol network on the surface of magnetic nanoparticles, i.e., the host; the reduced glutathione is modified on the adamantane to form the guest; finally, the host and the guest are mixed to obtain a magnetic metal-polyphenol network material based on β-CD; the present invention utilizes hydrophilic action to enrich glycosylated peptides, and utilizes Ti 4+ Phosphorylated peptides are enriched by coordination with phosphate ions; the paramagnetism of the internal Fe3O4 magnetic nanoparticles allows the enriched glycosylated peptides and phosphorylated peptides to be easily and quickly separated from biological samples with the assistance of external magnets, thereby improving the efficiency of the entire enrichment process.

The invention relates to the technical field of high polymer materials, and discloses a solvent-resistant polyurethane composite material and a preparation method thereof, and the material is prepared by reacting the following components: an isocyanate component, a polyol component and a functional chain extender component; the functional chain extender is a derivative of ortho-amino aromatic carboxylic acid protected by a thermally unstable ester group, and the protecting group is decomposed under a thermal treatment condition and releases a functional group in situ, wherein the functional group can be subjected to cyclization reaction with ureido on a polymer chain to form a heterocyclic cross-linked structure; the preparation method comprises the following steps: (a) reacting an isocyanate component, a polyol component and a functional chain extender to obtain a soluble and processable linear polyurethane precursor; and (b) carrying out high-temperature heat treatment on the molded precursor. Through the design of the latent functional group and the two-step process, the contradiction between the processability and the final performance of the cross-linked polyurethane is solved, and the prepared material has excellent solvent resistance, thermal stability and good mechanical properties.

The application refers to a novel combination treatment / combination medicament for PF-ILD treatment, comprising as a first combination partner a therapeutically effective amount of Nintedanib or a pharmaceutically acceptable salt thereof and as a second combination partner a therapeutically effective amount of a PDE4B-inhibitor of formula Iwherein Ring A is a 6-membered aromatic ring which may optionally comprise one or two nitrogen atoms andwherein R is Cl and wherein R may be located either in the para-, meta- or ortho-position of Ring A,wherein S* is a sulphur atom that represents a chiral center or a pharmaceutically acceptable salt thereof.Hereby the second combination partner is preferably a therapeutically effective amount of the PDE4B-inhibitior of formula IIIor a pharmaceutically acceptable salt thereof.

The invention provides a high-activity adjustable solid catalyst as well as a preparation method and application thereof. The preparation method of the adjustable solid catalyst comprises the following steps: mixing and stirring hexadecyl trimethyl ammonium bromide, ferric chloride hexahydrate and water according to a solid-to-liquid ratio of (1-3): (1-3): (30-40) to prepare a mixed solution; and dipping transition metal salt into the prepared mixed solution, and then carrying out hydrothermal crystallization reaction to prepare the high-activity adjustable solid catalyst. The product prepared by the invention is doped with transition metal, so that the coupling effect is strong; and the structure morphology of the catalyst and the distribution of transition metal elements are more uniform. Metal ions in the regular octahedral structure are located at the vertex, so that reactant adsorption is more facilitated, the selectivity of ortho-alkylation of aromatic compounds is higher, and the activity of catalyzing ortho-alkylation of the catalyst is obviously improved. The metal salt-loaded high-activity adjustable solid catalyst prepared by the invention can be applied to production of hindered phenol antioxidants from phenolic substances.

The invention discloses a zirconium-based metal organic framework material with high dehumidification capacity and excellent cycling stability and containing a one-dimensional pore channel as well as a preparation method and application of the zirconium-based metal organic framework material. By horizontally and axially expanding a core part of an X-type organic connector, an ortho-dibenzoic acid part of the organic connector is kept unchanged; the isomorphic synthesis of the zirconium-based metal organic framework material can simultaneously meet three necessary conditions that the zirconium-based metal organic framework material contains a one-dimensional pore channel, Zr6-cluster chelating coordination formate radicals are coplanar and the oxygen spacing of adjacent Zr6-cluster formic acid is less than or equal to 5.4. Meanwhile, introduction of water molecules in the center position between the adjacent Zr6 clusters can be effectively limited under the three conditions, and therefore the situation that the whole grid structure collapses due to unbalanced stress caused by the water molecules in the position in the desorption process is prevented. By intentionally shortening or prolonging the length of the organic linker core in the horizontal axial direction, the synthesized zirconium-based metal organic framework material containing the one-dimensional pore channel shows high water adsorption cycle stability.

The invention discloses 4-hydroxy-3-methyl benzoic acid monooxygenase, a strain and a preparation method and application thereof, and relates to the technical field of bioengineering, the nucleotide sequence of the 4-hydroxy-3-methyl benzoic acid monooxygenase is shown as SEQ ID NO: 1, and the amino acid sequence of the 4-hydroxy-3-methyl benzoic acid monooxygenase is shown as SEQ ID NO: 2 and / or SEQ ID NO: 3. The gene of the 4-hydroxy-3-methyl benzoic acid monooxygenase disclosed by the invention can be used for encoding to obtain the 4-hydroxy-3-methyl benzoic acid monooxygenase, and the obtained 4-hydroxy-3-methyl benzoic acid monooxygenase can be used for effectively catalyzing continuous oxidation of ortho-methyl of hydroxyl in 4-hydroxy-3-methyl benzoic acid; the selective continuous oxidation of the ortho-position methyl of the 4-hydroxy-3-methylbenzoic acid can be realized, the 4-hydroxyisophthalic acid is generated, and the compound 4-hydroxyisophthalic acid with industrial added value is synthesized while the selective oxidation of the methyl is solved.

The present disclosure aims to provide a perovskite composition that can obtain a crystalline film that is flat, free of voids, and has high power generation efficiency. [Solution] The perovskite composition according to this embodiment comprises a perovskite compound precursor, a first component which is a solvent for the perovskite compound precursor, and at least one second component selected from the group consisting of nitrogen-containing pyridines and 4-tert-butylpyridine. The nitrogen-containing pyridines are compounds in which a first nitrogen-containing group is bonded to one of the ortho, meta, or para positions of a pyridine ring, and a hydrogen atom is bonded to a position other than the position to which the first nitrogen-containing group is bonded, or at least one of the positions other than the position to which the first nitrogen-containing group is bonded is bonded to one selected from the group consisting of a carbon-containing group, a second nitrogen-containing group, and an alkoxy group.

The invention belongs to the technical field of organic synthesis, and discloses a symmetric disulfide compound containing a sulfoxide group and application of the symmetric disulfide compound in glycosylation reaction, and the structural general formula of the compound is as shown in formula (I). According to the present invention, the compound represented by the structural general formula (I) contains sulfoxide and disulfide structures, and the sulfinyl forming the sulfoxide and the disulfide bond-containing group are located at the ortho-position of the aromatic ring, such that the compound can be used as the activation reagent for the glycosylation reaction, and particularly, activation of the glycosyl donor and glycosylation reaction can be efficiently promoted by only using 0.25 times of equivalent weight of the glycosyl donor, so that the use of a highly toxic, expensive, unstable or metal-containing activating reagent is avoided, and the problems that the activating reagent of the thioglycoside donor in the existing glycosylation reaction is unstable, is not easy to prepare and often needs equivalent weight or excessive amount are solved.

This invention discloses a migration C(sp²)-H / C(sp³)-H cross-coupling reaction achieved using metal / photoredox catalysis, belonging to the fields of organic chemistry and medicinal chemistry. Under the action of a nickel source, photocatalyst, ligands, base, and additives, this invention enables the reaction of alkanes with ortho-alkenyl-substituted aryl halides or ortho-pyridine-substituted aryl halides in an organic solvent under light irradiation, yielding a series of polysubstituted olefins or polysubstituted aromatic compounds with excellent regioselectivity, stereoselectivity, and good yields, which can serve as active pharmaceutical molecules. This invention uses inexpensive transition metal nickel as a catalyst, readily available alkanes and haloaromatics as raw materials, and features mild and simple conditions, good functional group compatibility, and easy operation.

The invention concerns a composite comprising fibre materials with a density of less than or equal to 450 kg / m3 bonded by an aqueous adhesive composition. The composition comprises a thermosetting resin based on: - at least one aromatic compound A1 comprising at least one aromatic ring bearing at least two functions, one of these functions being an aldehyde function or a hydroxymethyl function and the other being an aldehyde function or a hydroxymethyl function; - at least one aromatic phenol compound A2 bearing at least one aromatic ring bearing at least two hydroxyl functions, said functions being in the meta position relative to one another, the two positions ortho to at least one of the hydroxyl functions being unsubstituted; in which the amount of resin is at least 3.5% by weight of dry extract of resin relative to the total weight of the composition.

The present invention relates to the use as perfuming ingredient of a compound of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein, when R 1 represents a C 1‑2 1-4 alkyl group, X represents a CHO group; or, when R 1 represents a hydrogen atom or a C 1‑2 1-4 alkyl group, X represents a CH(R 6 )CHO group; R 2 , R 3 , R 4 , R 5 and R 6 independently of one another represent a hydrogen atom or a C 1‑2 1-4 alkyl group, or R 3 and R 4 together represent an ethanediyl group; and, relative to position 1, the -C(R 3 )(R 4 )-CH(R 5 )-OH group is an ortho, meta, para substituent of the aromatic ring or a mixture thereof. Furthermore, the compound of formula (I) as part of a perfuming composition or of a perfumed consumer product is also part of the invention.

The invention relates to a catalytic system based on at least one neodymocene borohydride, a dialkylzinc compound, and an organomagnesium halide of formula RB-Mg-X, wherein RB comprises a benzene ring with two substituted carbon atoms, one of which is substituted by a methyl, ethyl, or isopropyl group, or forms a ring with its nearest carbon atom, the second carbon atom being substituted by a methyl, ethyl, or isopropyl group, the magnesium atom being in the ortho position with respect to each of said two carbon atoms, and X is a halogen atom. The catalytic system is usable both in the homopolymerization of ethylene and in the copolymerization of ethylene and a 1,3-diene.