32 results about "Magnesium iodide" patented technology

Provided is a metal halide lamp capable of being dimmed, which is prevented from non-lighting due to leakage of an arc tube attributable to a crack occurring at thin tubes, as well as realizing a desired color characteristic. The metal halide lamp has an arc tube that includes an envelope made of translucent ceramic, a pair of electrodes, and metal halides, the metal halides including rare earth metal halide, sodium halide, and magnesium halide, the rare earth metal halide being at least one of dysprosium halide, thulium halide, holmium halide, cerium halide, and praseodymium halide, and the magnesium halide being at least one of magnesium iodide and magnesium bromide, where when a maximum lamp power P (W) is in a range of 70 W to 250 W, the following relations are satisfied:0.0345A+0.0028B<0.0015 P+0.0475;A≧0.021P+0.313; andB≧10.0,where A (mg) represents a total content of the metal halides, and B (mol %) represents a content ratio of the magnesium halide to the metal halides.

The invention discloses a preparation method of a caine drug intermediate (S)-2-piperidinecarboxylic acid, which specifically comprises the following steps: a) preparing 5-chlorovaleraldehyde, L-phenylene glycol and trimethylsilyl cyanide Carry out one-pot reaction under the effect of catalyst A to obtain the compound shown in formula (I); Described catalyst A is magnesium diiodide, magnesium dibromide, magnesium perchlorate; (b) formula (I) The compound catalytic hydrogenation reaction shown obtains (S)-2-cyanopiperidine shown in formula (II); (c) the compound hydrolysis shown in formula (II) obtains (S)-2 shown in formula (III) ‑piperidinecarboxylic acid. The preparation method utilizes cheap and easy-to-obtain organic raw materials, and has the advantages of simple operation, mild reaction conditions, good stereoselectivity, high yield and the like.

The invention discloses an asymmetric beta-diimine univalent magnesium complex as well as a preparation method and an application thereof in a hydroboration reaction of nitrile. The preparation methodcomprises the steps as follows: firstly, acetylacetone and 2,6-diisopropyl aniline are condensed and then react with 2,4,6-trimethylaniline to produce an asymmetric beta-diimine ligand, then the asymmetric beta-diimine ligand reacts with the same amount of methylmagnesium iodide to produce magnesium iodide, finally, the magnesium iodide is reduced with excessive sodium, and the asymmetric beta-diimine univalent magnesium complex is obtained. The preparation method is simple, the synthesized asymmetric beta-diimine univalent magnesium complex has the high yield and has significant effects in the hydroboration reaction of nitrile, the reaction condition is mild, the reaction speed is high, the yield can reach 90% or above, and a catalyst has very high activity.

The invention discloses a chemical phase analysis method for passivated magnesium. The chemical phase analysis method comprises the following steps: utilizing the characteristic that the magnesium metal in a specimen can take a reaction with iodine to generate magnesium iodide to be dissolved in methyl alcohol, so as to effectively separate out the magnesium metal from the specimen, enabling the magnesium oxide in the precipitate to take a reaction with nitric acid, putting the reactant in a solution, respectively carrying out EDTA (Ethylene Diamine Tetraacetic Acid) developing titration on the solution dissolved with the magnesium metal or magnesium oxide, so as to obtain the content of the magnesium metal and the magnesium oxide. The chemical phase analysis method disclosed by the invention is quick, accurate, efficient, and simple in operation, and has better practicability.

The invention discloses an asymmetric beta-diimine monovalent magnesium compound, a preparation method and an application thereof in aldehyde-ketone-boron hydrogenation reaction. The preparation method comprises the following steps: firstly condensing acetylacetone respectively with different types of aromatic amine to generate asymmetric beta-diimine ligand, then reacting the asymmetric beta-diimine ligand with equivalent magnesium methyl iodide to generate iodide of magnesium, and finally using excessive sodium for reduction to obtain the asymmetric beta-diimine monovalent magnesium compound. The preparation method disclosed by the invention is simple, the synthesized asymmetric beta-diimine monovalent magnesium compound has an obvious effect in aldehyde-ketone-boron hydrogenation reaction, the use amount of a catalyst is only 0.1%, the reaction speed is high, the yield is very high, and the idea of green chemistry is highly conformed.

Disclosed is a method for catalytic synthesis of salidroside. The method comprises: enabling total acetyl glucose to react with 4-benzyloxy-phenethyl alcohol under the action of a catalyst to obtain 2-(4-benzyloxyphenyl)ethyl-(2,3,4,6-O-tetra-acetyl)-β-D-glucopyranoside, the catalyst being tin chloride, zinc oxide, aluminum trichloride, boron fluoride or copper chloride, or a mixture formed by mixing one of tin chloride, zinc oxide, aluminum trichloride, boron fluoride and copper chloride with magnesium fluoride, magnesium chloride, magnesium bromide or magnesium iodide; and removing an acetyl protective group from the product in the presence of an organic base to obtain 2-(4-benzyloxyphenyl)ethyl-β-D-glucopyranoside, and introducing hydrogen into 2-(4-benzyloxyphenyl)ethyl-β-D-glucopyranoside under the catalysis of palladium and carbon to perform a reduction reaction so as to remove a benzyl protective group, thereby obtaining 2-(4-hydroxyphenyl)ethyl-β-D-glucopyranoside. The present invention has the outstanding characteristics that the yield is high, the total acetyl glucose is subjected to three steps of reactions, the total yield can reach 63%, the process is simple, the cost is low, and the present invention is suitable for industrial mass production.

The invention discloses an unsymmetrical β-diimine monovalent magnesium compound as well as its preparation method and application. Its preparation method is as follows: first condense acetylacetone with different kinds of aromatic amines respectively to generate asymmetric β-diimine ligands, then react it with an equal amount of methylmagnesium iodide to generate magnesium iodide, and finally use excess The sodium reduction of unsymmetrical β-diimine monovalent magnesium compound. The asymmetric β-diimine monovalent magnesium compound prepared by the invention has a remarkable catalytic effect in the hydroboration reaction of alkynes, the reaction conditions are mild, the reaction speed is fast, the yield can reach more than 90%, and the catalyst has high activity. , which is the first case of using an alkaline earth metal compound to catalyze this type of reaction, which has good practicability.

The invention relates to a bis(methylsiloxy)ferrocene tricarbon ester monomer and a preparation method thereof. The chemical structural formula of the bis(methylsiloxy)ferrocene tricarbon ester monomer is shown in a formula I as described in the specification. The preparation method for the monomer comprises a step of reacting 1,1'-ferrocenedialdehyde with 1-methoxy-1-(trimethylsiloxy)-2-methyl-1-propylene under the catalysis of a catalyst--magnesium iodide diethyl ether complex. The bis(methylsiloxy)ferrocene tricarbon ester monomer prepared in the invention can be used for preparation of a conductive material.