802 results about "Phenol Compound" patented technology

The invention relates to a whitening and freckle-removing composition containing a composite plant extract and a preparation method of the whitening and freckle-removing composition, and belongs to the technical field of cosmetics. The composition disclosed by the invention is prepared from the following raw materials in parts by weight: 5 to 8 parts of pineapple leaf nano cellulose, 10 to 16 parts of modified starch, 10 to 15 parts of longan seed extract, 6 to 10 parts of mulberry bark extract, 5 to 8 parts of nicotinamide and 8 to 10 parts of hyaluronic acid. The pineapple leaf nanocellulose contains flavonoid and phenolic compounds with double-bond, conjugated double-bond and triple-bond structures, and modified starch is used as a filler to form a film on the surface of skin, so that an anti-ultraviolet protection wall is formed; the betaine-malate ionic liquid is added into the longan seeds, so that extraction of polyphenol in the longan seeds is improved, the longan seeds have acid-base buffering capacity, an auxiliary does not need to be added to adjust the pH value, the components of the prepared composition interact, and the whitening and freckle removing effects are achieved from multiple aspects of ultraviolet resistance, oxidation resistance, inflammation resistance and skin metabolism improvement.

The invention relates to the technical field of well cementation materials and provides well cementation cement stone based on water-based benzoxazine resin as well as a preparation method and application of the well cementation cement stone. The well cementation cement stone is prepared from the following components in parts by mass: 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss agent, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of a high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water, and the high-temperature-resistant water-based benzoxazine monomer is prepared from a phenolic compound, primary amine and formaldehyde through Mannich reaction. Resin formed by the prepared benzoxazine monomer has improved mechanical properties at a high temperature of 150-200 DEG C, the mechanical properties and high temperature resistance of well cementation cement at a high temperature are significantly improved by filling pores of set cement and optimizing cement components, the benzoxazine monomer in a cement slurry system does not affect the fluidity of cement slurry, and the well cementation cement has a good application prospect. Meanwhile, the high-temperature strength of set cement can be remarkably enhanced, and the cement is suitable for well cementation of high-temperature deep wells.

The invention discloses a preparation method of a double embedding emulsion preparation / emulsion based on octenyl succinic acid cyclodextrin ester, and relates to an inclusion compound based on modified cyclodextrin and a stable Pickering emulsion system thereof. According to the method, the uniformity of the cyclodextrin modification substitution degree is improved through ultrasonic assistance, the embedding rate and the embedding stability of hydrophobic active ingredients can be improved, meanwhile, the Pickering emulsion is stabilized, preparation of the double-embedded emulsion preparation is achieved, and the stability and the packaging efficiency of an emulsion preparation packaging delivery system can be effectively improved through the method. The method comprises the following steps: 1, preparing octenyl succinic acid cyclodextrin ester; 2, preparing an OSA-beta-CD / phenolic compound clathrate compound; and 3, preparing the dual-embedding emulsion preparation / emulsion. The invention provides a preparation method of a double-embedding emulsion preparation / emulsion based on octenyl succinic acid cyclodextrin ester. The double-embedding emulsion preparation / emulsion can be applied to a double-embedding food functional component delivery system.

This invention belongs to the field of high-value utilization technology of biomass resources, and discloses a method for catalyzing the depolymerization of lignin into phenolic compounds using a RuNiZn / Nb2O5 catalyst. The method includes: uniformly mixing the RuNiZn / Nb2O5 catalyst, lignin-containing biomass feedstock, and water; stirring under hydrogen atmosphere to carry out the depolymerization reaction; after the reaction, cooling to room temperature and performing solid-liquid separation; evaporating the solvent to obtain the hydrogenated depolymerization product containing monophenols. In this invention, the RuNiZn / Nb2O5 catalyst employs a technique of replacing precious metals with various non-precious metals, which improves the catalyst's reactivity and reduces the amount of precious metals used. This increases the yield of lignin depolymerization products, provides milder depolymerization reaction conditions, and ultimately significantly reduces the catalyst preparation cost and the energy cost of the lignin depolymerization process.

Provided is method for producing a glycoside in which a phenolic compound is bonded to an anomeric position of a sugar, the method including: a step (1) of reacting a peracetylated sugar with the phenolic compound in the presence of an acid catalyst; and a step (2) of directly adding a deacetylating agent and a deacetylating solvent selected from the group consisting of water and an alcohol to a reaction mixture obtained in the step (1) to perform a deacetylation reaction.

The invention discloses a method for efficiently extracting phenol from coal tar and primarily separating crude phenol oil, and relates to the technical field of chemical separation. Carrying out multi-stage cross-flow or counter-flow extraction on the extracting agent and the coal tar to obtain a raffinate phase and a high-concentration extraction phase; and mixing the raffinate with condensate at the top of the regeneration device and supplemented fresh water, and recovering residual organic amine through a reverse extraction device to obtain a dephenolized oil product and backwashing water. Mixing and diluting the extract phase with backwashing water, and standing for phase splitting to obtain a high-grade crude phenol oil phase and a low-concentration extract phase; the low-concentration extraction phase absorbs CO2 in the industrial tail gas for acidification to obtain a low-grade crude phenol oil phase and an amine salt aqueous solution; and desorbing the amine salt aqueous solution to obtain a regenerated extraction agent (circularly used for extraction), tower top condensate (circularly used for reverse extraction) and water-containing industrial-grade CO2 gas (recycled or sealed after drying). According to the method, high-efficiency extraction of the phenolic compounds in the coal tar and primary separation of crude carbolic oil are realized by utilizing the extraction performance differences of extraction capacities, selectivity and the like of the extraction agents with different concentrations on the phenolic compounds, and the production economy is improved.

The invention provides a multi-mode remote sensing tea garden automatic identification method and system integrating phenolic indexes and phenological characteristics. According to the method, the growth amplitude GA reflecting tea phenological characteristics is calculated through medium-resolution time sequence radar data, and the normalized vegetation index NDVI, the phenolic compound index PCI and the phenol high-value dominant index PHD are calculated from optical remote sensing images so as to represent the growth condition of the tea tree and the change rule of the phenol content. A double-branch lightweight deep learning model is constructed, a first branch processes a high-resolution remote sensing image, and a second branch processes multi-modal tea garden remote sensing features; and then multi-modal geoscience knowledge of the tea garden is fully extracted and fused through a double-branch fusion module, refined and automatic extraction of large-area tea garden distribution is realized, and key technical support is provided for tea garden resource monitoring, management and the like.

The present application belongs to the technical field of flame-retardant materials, and specifically relates to a halogen-free flame retardant containing a Schiff base structure, a preparation method thereof, and application of the halogen-free flame retardant in epoxy resin. The halogen-free flame retardant containing phosphorus, nitrogen elements and a Schiff base structure is obtained through a Schiff base reaction between an intermediate and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, wherein the intermediate is prepared through a nucleophilic substitution reaction between an aldehyde group-containing phenolic compound and an acyl chloride compound. The flame retardant has good thermal stability, significantly improved char yield, excellent flame-retardant effect, and significantly improved mechanical properties due to the combination of the Schiff base structure and phosphorus and silicon elements. The halogen-free flame retardant is further used to modify epoxy resin to prepare a flame-retardant epoxy resin, which can significantly improve the char performance and mechanical properties of the epoxy resin with little influence on the thermal performance of the epoxy resin cured product, and has excellent flame-retardant efficiency.

The invention discloses a solid electrolyte-coated silicon-carbon composite material and a preparation method thereof, and is characterized in that a negative electrode material has a core-shell structure, the core is metal-doped porous carbon and nano silicon deposited in pores, and the shell is a solid electrolyte complex. The preparation method comprises the following steps: uniformly mixing an emulsifier, a phenolic compound, an aldehyde compound, a cross-linking agent, a metal salt of the cross-linking agent and a template agent, then adding an oxidizing agent for reaction, and preparing metal-doped porous carbon through heteroatom doping and activation; depositing nano silicon through a vapor deposition method, coating the surface of the nano silicon with a solid electrolyte through a liquid phase method, and carbonizing to obtain the solid electrolyte coated silicon-carbon composite material. The obtained material has the characteristics of excellent fast charging performance, high initial efficiency and the like when applied to lithium ion batteries.

The present disclosure relates to the technical field of film material, and particularly to a polymeric polyphenol-modified polymer film, a preparation method thereof and a metallized polymer film. According to the present disclosure, corona treatment is performed to a surface of a polymer layer, so that a polar modifying liquid can uniformly coat the surface of the polymer layer, thereby forming a modification layer tightly combined with the polymer layer. Thus, the low-polarity polymer layer surface can be imparted with a durable high polarity. Consequently, the polymer layer is capable of being stably and tightly bonded to a material layer with high polarity and high surface tension, such as a metal layer, for a long period of time, effectively broadening the application scenarios for non-polar polymer substrate layers. By controlling the concentrations of the polyphenolic compound and the cross-linking agent in the modifying liquid, the modification layer formed by a cross-linking reaction can have a suitable cross-linking density and an adequate number of hydroxyl groups, thereby further effectively and stably enhancing the long-term polarity and surface tension of the polymer layer. The preparation method is simple and easy to operate, cost-effective, efficient, and easy to scale up.

The invention belongs to the technical field of traditional Chinese medicine biology, and particularly relates to application of a phenolic compound in preparation of a medicine for preventing or treating hepatic fibrosis. A pair of phenolic diastereoisomers (+)-fresh bamboo juice phenol C and (-)-fresh bamboo juice phenol C are separated from fresh bamboo juice, and an anti-hepatic fibrosis activity screening test shows that (+)-fresh bamboo juice phenol C has a remarkable inhibition effect on human hepatic stellate cells LX-2, has clinical application potential in anti-hepatic fibrosis treatment, and has broad application prospects. The method can be used for preparing medicines for preventing or treating hepatic fibrosis, and a new basis is provided for pharmacological research of fresh bamboo juice.

Provided is a method for producing a protected glycoside derivative, including reacting a sugar in which all hydroxyl groups of the sugar are protected by protective groups and protective groups of a hydroxyl group at a 1-position and a hydroxyl group at a 2-position are acyl groups, with a phenolic compound in the presence of at least one catalyst selected from the group consisting of trifluoromethanesulfonic acid and copper (II) trifluoromethanesulfonate, in which the phenolic compound is bonded to an anomeric position of the sugar and other hydroxyl groups of the sugar are protected.

The invention discloses a preparation method and application of a repulpable gallic acid-based waterproof and oil-proof agent, and belongs to the technical field of bio-based oil-proof hydrophobic paper surface coatings. The preparation method comprises the following steps: by taking alkyl gallate and epoxy chloropropane as raw materials, preparing alkyl gallate epoxy through epoxidation reaction; and uniformly mixing the alkyl gallate epoxy resin with an acid anhydride / phenol compound to obtain the alkyl gallate epoxy resin series waterproof and oil-proof agent. The structure of the bio-based waterproof and oil-proof agent prepared by the invention contains groups such as a non-polar long alkyl chain, an epoxy group and an amino group, a compact cross-linked coating can be formed on the surface and the interior of paper, and gaps between paper cellulose are filled, so that permeation of oil, water and gas is blocked, meanwhile, the adhesive force between the coating and the paper is increased, and the waterproof and oil-proof effects are improved. The fibers are more tightly combined together; non-polar long alkyl chains and benzene ring groups in the structure can endow the paper with excellent oil-proof, hydrophobic and mechanical properties, and flexible chain segments (alkyl carbon chains) with different lengths are introduced to adjust the flexibility of the coating, so that the flexibility and tensile strength of the paper can be effectively adjusted; the coating paper can be recycled and reused in an alcoholysis mode. The raw materials are easy to obtain and renewable, paper can be re-pulped after being coated, and the paper has the potential of replacing plastic packaging and meets the performance requirements of paper packaging on specific scenes such as water resistance and oil resistance.

The invention discloses a phosphorus-nitrogen synergistic flame-retardant benzoxazine / epoxy resin composite material and a preparation method thereof. Firstly, a phenolic compound and DOPO react to generate an intermediate product, and then the intermediate product, an amine compound and paraformaldehyde are subjected to a dehydration condensation reaction to generate the phosphorus-nitrogen synergistic flame retardant benzoxazine. The phosphorus-nitrogen synergistic flame-retardant benzoxazine is added into epoxy resin for thermocuring to obtain the composite material. The prepared benzoxazine flame retardant contains phosphorus and nitrogen elements, the nitrogen-based flame retardant has the advantages of low pollution, low smoke, good compatibility with EP and the like, and a quenching effect, a dilution effect and a carbon layer barrier effect can be generated in the combustion process to prevent further combustion of flames. The composite material has better flame retardant property, can effectively reduce the risk of fire hazard caused by overheating or short circuit of equipment, and ensures the safe and stable operation of energy equipment.

The invention belongs to the field of rubber additives, and particularly relates to an anti-aging agent as well as a synthesis method and application thereof. RT base and a phenol compound are used as raw materials for synthesis under the action of a catalyst; the phenol compound is a mixture of phenol and o-methylphenol. According to the invention, RT base (p-aminodiphenylamine) is used as a precursor and reacts with phenol or o-methylphenol in the presence of a catalyst to produce the anti-aging agent. Salt-containing waste water is not generated in the precursor production process, and compared with hydroquinone serving as a precursor, the precursor has the obvious cost advantage and the environment-friendly advantage.

The invention belongs to a preparation method of furan resin, and provides formaldehyde-free plant polyphenol modified furan resin and a preparation method thereof in order to solve the technical problems of formaldehyde harm, non-renewable raw material phenol source and poor environmental protection property in the existing furan resin preparation process. The plant polyphenol modified furan resin is prepared by carrying out condensation polymerization on a phenolic mixture and bio-based aldehydes, and the phenolic mixture comprises plant polyphenol and another phenolic compound. The crosslinking density and the mechanical property of the resin are obviously improved. Meanwhile, a three-dimensional cross-linked network is constructed by replacing formaldehyde with a bio-based aldehyde compound to serve as a cross-linking agent, and mild and controllable reaction conditions are realized by combining a weakly acidic environment-friendly catalyst system. The problem of formaldehyde release in the resin synthesis and curing process is effectively solved, the obtained resin is high in bio-based content, has the rapid curing characteristic and excellent mechanical strength, the wastewater treatment difficulty is remarkably reduced, and the remarkable environment-friendly advantage is achieved.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a preparation method and application of a phenolic resin-based spherical porous carbon negative electrode material. The preparation method comprises the following steps: adding phenol, at least one natural polyphenol compound, formaldehyde, at least one biomass-based aromatic aldehyde compound, ammonia water and deionized water into a reaction container, keeping stirring, raising the temperature, adding a dispersing agent, continuously raising the temperature after a constant-temperature reaction, and carrying out a constant-temperature reaction to obtain the phenolic resin. Then adding a curing agent, raising the temperature, adjusting the pH value, and carrying out a constant-temperature curing reaction to obtain a phenolic resin-based precursor; and finally, carrying out high-temperature carbonization to obtain the phenolic resin-based spherical porous carbon negative electrode material for the lithium battery, which has high specific capacity and low expansion rate.

The invention relates to a low-total-chlorine epoxy resin synthesis method, and belongs to the technical field of epoxy resin preparation. The invention provides a low-total-chlorine epoxy resin synthesis method. The low-total-chlorine epoxy resin synthesis method comprises the following steps: carrying out ring-opening reaction on a dihydric phenol compound and epoxy chloropropane in a mixed organic solvent under the action of alkali metal hydroxide; the mixed organic solvent is composed of a ketone solvent and an ether solvent, the ketone solvent is diisobutyl ketone, and the ether solvent is butyl ether and / or a branched ether compound; then carrying out mixed reaction on the system after the ring-opening reaction and an alkali metal hydroxide solution so as to carry out ring-closing reaction on a ring-opening reaction product; and finally, carrying out impurity removal and purification on the system after the ring-closure reaction to obtain the low-total-chlorine epoxy resin.

Methods for the production of syringol from biomass are provided. Reactive diluents derived from syringol and their use in 3D printing are also provided.

The invention provides metal-hydrogen modified porous carbon and a preparation method thereof, a silicon-carbon composite material and a preparation method thereof, and a battery, and the preparation method of the metal-hydrogen modified porous carbon comprises the following steps: mixing an aldehyde compound, a phenolic compound, a metal source and a catalyst, and carrying out heating treatment to prepare modified phenolic resin; carrying out carbonization treatment on the modified phenolic resin to prepare metal-doped porous carbon; mixing the metal-doped porous carbon with a metal hydride reducing agent, and performing reduction treatment to prepare metal-hydrogen modified porous carbon; wherein the mass ratio of metal elements to phenolic compounds in the metal source is (2-5): 100. A proper amount of metal-hydrogen bonds are introduced into the inner surface of a porous carbon pore structure; when the porous carbon is subsequently subjected to silicon deposition, low-temperature, uniform and confined deposition of nano silicon in a porous carbon matrix is facilitated, and the silicon-carbon composite material with low expansion rate and excellent electrochemical performance is prepared.

The invention provides a nylon fabric color fixing agent and a preparation method thereof, the color fixing agent comprises a bio-based compound and a nano barrier component, the bio-based color fixing component is a compound formed by quaternized chitosan, tannic acid and zirconium ions, and the nano barrier component is cellulose nanocrystalline-ZIF-8-coated SiO2 core-shell particles. The color fixing agent disclosed by the invention avoids the use of bisphenol compounds in the traditional color fixing process, and has the characteristic of environmental protection.

The invention provides a metal-doped porous carbon material, a metal-doped silicon-carbon composite material, a preparation method and application of the metal-doped porous carbon material and the metal-doped silicon-carbon composite material, and a lithium ion battery, and belongs to the technical field of carbon materials. The preparation method comprises the following steps: mixing a phenolic compound, an aldehyde compound, a surfactant, an alkaline reagent, a metal compound and water, and carrying out addition-polycondensation reaction on the obtained mixed material liquid to obtain metal-doped phenolic resin; and sequentially carrying out re-curing treatment, pyrolysis treatment and activation treatment on the metal-doped phenolic resin to obtain the metal-doped porous carbon material. According to the metal-doped porous carbon material prepared by the method disclosed by the invention, metal is uniformly doped in the porous carbon material, and on the basis, silicon is deposited to obtain the metal-doped silicon-carbon composite material; the metal-doped silicon-carbon composite material as a negative electrode material of a lithium ion battery has relatively high initial coulombic efficiency and relatively good rate capability and cycle performance.

The present application relates to a kind of bismaleimide resin compositions and the semi-cured sheet and laminated plate prepared therefrom, comprising components: bismaleimide compound, allyl phenol compound and oxetane compound, the equivalent ratio range of double bond in the bismaleimide compound and double bond in the allyl phenol compound is 3~0.3, the oxetane compound accounts for 0.5~5% of the overall resin, the preparation process of semi-cured sheet and laminated plate includes the following preparation steps: step S1, the glue liquid prepared by bismaleimide resin composition is infiltrated into glass fiber cloth, and then baked and dried to obtain semi-cured sheet;Step S2, the surface of semi-cured sheet is covered with metal foil, and high-temperature pressing is formed, the advantage of the present application is that the glue liquid of resin composition, semi-cured sheet has good storage property, and the laminated plate prepared therefrom has excellent heat resistance, copper foil bonding force and moisture resistance.

The invention relates to the technical field of natural medicines, in particular to a 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound as well as a preparation method and application thereof. The 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound disclosed by the invention has a structure as shown in a formula I; the method comprises the following steps: extracting hypericum monogynum by using ethanol and petroleum ether, sequentially eluting the obtained petroleum ether extract through silica gel column chromatography, MCI resin column chromatography, Sephadex LH-20 gel column chromatography and ODS medium-pressure column chromatography, and purifying the collected eluate through preparative ODS liquid chromatography and semi-preparative ODS liquid chromatography to obtain the 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound. The 3 / 6 / 5 / 6 / 5 pentacyclic phloroglucinol compound is extracted from hypericum monogynum for the first time, and the compound has great development value as a novel medicine for preventing or treating calcified aortic valve diseases.

The invention provides an application of two polycyclic polyisopentenyl acyl phloroglucinol compounds (PPAP) with different skeleton types in preparation of drugs for relieving / treating neurodegenerative diseases. Belongs to the technical field of medicines. Hypheronone A provided by the invention is a 1, 9-split-ring polycyclic polyisopentenyl phloroglucinol compound, and hypheronone L is a polycyclic polyisopentenyl phloroglucinol compound which is formed by carrying out intramolecular [4 + 2] cyclization on a monocyclic polyisopentenyl phloroglucinol compound and has a complex ring system. The compound hypherone A and the compound hypherone L both have the activity of enhancing the current of a voltage-gated T-type calcium channel, can be used for preparing medicines for treating neurodegenerative diseases, particularly can be used for preparing medicines for relieving and / or treating diseases such as spinal cerebellar ataxia, Alzheimer's disease and intellectual syndrome, and have clinical application value.

The invention relates to the field of automobile oil-water transmission systems, in particular to an anti-aging and anti-oxidation oil-water transmission pipe for an automobile and a preparation method of the anti-aging and anti-oxidation oil-water transmission pipe, and aims to solve the problems that an existing oil-water transmission pipe is poor in anti-aging and anti-oxidation performance and anti-corrosion performance, so that the oil-water transmission pipe is often aged, oxidized and corroded; and the performance of the oil-water transmission pipe is reduced. According to the oil-water transmission pipe, the multi-hindered phenol compound and the multi-fluorine compound are used as additives, so that the aging oxidation resistance and the oil corrosion resistance of the oil-water transmission pipe are remarkably enhanced, the aging and corrosion of materials can be effectively prevented, and the service life of the oil-water transmission pipe is greatly prolonged; the maintenance cost and the replacement frequency caused by aging and corrosion of the oil-water transmission pipe are reduced, so that the long-term stable operation of the oil-water transmission system is ensured.

The present invention aims to provide a vehicle composition for inorganic fine particle dispersion which has excellent decomposability at low temperature and enables degreasing in a short time, an inorganic fine particle-dispersed slurry composition containing the vehicle composition for inorganic fine particle dispersion, and a method for producing an inorganic fine particle-dispersed sheet with the inorganic fine particle-dispersed slurry composition. The present invention relates to a vehicle composition for inorganic fine particle dispersion, containing a binder resin, an organic solvent, and an organic compound having a boiling point at normal pressure of 200° C. or higher and lower than 400° C., the binder resin containing a (meth)acrylic resin, the organic compound containing at least one selected from a phenol compound, an aromatic amine compound, a quinone compound, and a nitro compound, the amount of the organic compound being 1 to 100 parts by weight relative to 100 parts by weight of the binder resin.

The present invention relates to a process for the preparation of polyaminocarboxylic acids, in particular phenolic aryl- or alkyldiaminepolycarboxylic acids, preferably a compound of formula (I): wherein X is selected from the group consisting of: H, COOH, COO−Y+, OH, linear or branched C1-C5 alkyl, CH2OH, SO3H, SO3−Y+, wherein: —Y+ is independently selected from the group consisting of: Li+, Na+, K+, and NH4+; and wherein A is selected from: −A (CH2)n linear aliphatic system, wherein n=2, 3 or 4, preferably 2 or 3; and—an aromatic system of formula (II): wherein R1, R2 are independently selected from the group consisting of H, OH, and linear or branched C1-C5 alkyl; said process comprising the step of reacting, a phenol compound, glyoxylic acid and an aryl- or alkyldiamine in the presence of an iron source to obtain a reaction mixture comprising the compound of

The application provides a phenolic-based non-supporting mesoporous-microporous carbon membrane and a preparation method and application thereof. The method comprises the following steps: reacting raw materials including phenolic compounds, amine compounds, aldehyde compounds and surfactants to obtain a resin precursor; performing low-temperature aging forming on the resin precursor to obtain an organic membrane; and performing high-temperature carbonization on the organic membrane. The application provides a fast, simple and efficient carbon membrane preparation method, and the prepared carbon membrane has uniform and adjustable pore structures.

The invention is directed to a process for the preparation of an aromatic acid or a phenolic compound, said process comprising reacting a dienophile and a furanic compound comprising an acetal moiety in a Diels-Alders reaction to obtain an aromatic compound comprising said acetal moiety, followed by hydrolysis and oxidation of said acetal moiety into a hydroxide or carboxylate moiety to form the aromatic acid or phenolic compound, wherein said dienophile is selected from the group consisting of alkylenes, acetylenes, acrylates, maleates, fumarates, maleimides, propiolates, acetylene dicarboxylates, and benzynes and wherein said acetal moiety is bound directly to the 2-position of the furanic compound.