Abstract:
PROBLEM TO BE SOLVED: To provide an economical method of producing tetrahydrogeraniol by reaction or use of the residues obtained during the production of linalool, citronellal, citronellol or geraniol/nerol. SOLUTION: The production mixture and distillation residue obtained from the syntheses of linalool, citronellal, or geraniol/nerol is directly subjected to the catalytic hydrogenation. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a continuous method of producing an unsaturated alcohol by selectively hydrogenating an olefinically unsaturated carbonyl compound, particularly citral is selectively hydrogenated to continuously produce a mixture of geraniol and nerol. SOLUTION: An olefinic unsaturated carbonyl compound is selectively hydrogenated in the reactor including the liquid phase that holds at least one kind of catalyst suspension and may include the gas phase additionally to produce unsaturated alcohols. The reactor used in this process has an opening or a flow channel with the hydraulic diameter of 0.5-20 mm. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide an improved process for the preparation of an iron-doped ruthenium catalyst supported on carbon, and to provide its use for a selective liquid phase hydrogenation of a carbonyl compound to give a corresponding alcohol. SOLUTION: In the process for the preparation of the catalyst comprising iron in addition to ruthenium on the carbon support, the process comprises a stage of simultaneously precipitating the catalytically active components onto the support. The catalyst prepared can be used to obtain geraniol or nerol in good selectivity by in particular the hydrogenation of citral. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an N-alkenylcarboxamide, making it possible to achieve a high conversion and a high selectivity and capable of being performed under the atmospheric pressure, and especially to provide a method for synthesizing N-vinylpyrrolidone(NVP) from N-(2-hydroxyethyl) pyrrolidone(HEP). SOLUTION: This method for producing an N-alkenylcarboxamide comprises dehydrating an N-(2-hydroxyalkyl)carboxamide and/or its diether in the presence of a catalyst. Therein, a molecular sieve having a modulus of at least 140, especially zeolite, is used as the catalyst. COPYRIGHT: (C)1999,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an N-formylaminocarboxylate in a high yield and high selectivity, having no defect of conventional technology and usable for large-scale production. SOLUTION: This method for producing the N-formylaminocarboxylate comprises reacting an aminocarboxylic acid with a formate.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of producing an acetoacetic acid ester, capable of avoiding a peculiar defect caused by conventional technology for producing 2,15-hexadecanedione, and capable of producing the product simply and economically. SOLUTION: This method of producing the acetoacetic acid ester expressed by one of the formulae (Ia) and (Ib) (R is a straight-chain or branched-chain 1-6C alkyl which may be substituted, a 1-6C alkoxyalkyl or phenyl) comprises including a process for adding an acetoacetic acid ester expressed by the formula (II) to 1,9-decadiene through a free radical reaction.
Abstract:
PROBLEM TO BE SOLVED: To produce the flavor of a wood and an amber grease, having a stronger fragrance than those of flavors by conventional techniques and having excellent improved characteristics such as excellent durability, fragrance threshold and dilution degree lower limit. SOLUTION: (+)- And (-)-2-cyclododecylpropanol, (+)- and (-)-2- cyclododecylpropionic acid and their salts, and methods for producing the compounds and the uses of the compounds.
Abstract:
PROBLEM TO BE SOLVED: To provide a new method for industrially advantageously producing a glyoxal monoacetal, enabling to profitably obtain the glyoxal monoacetal by reacting glyoxal and a glyoxal bisacetal with an alcohol under a specific reaction condition. SOLUTION: This method for producing a glyoxal monoacetal of formula I (R , R are each a 1-4C alkyl, a 2-4C alkenyl) comprises reacting the mixture of glyoxal with a glyoxal bisacetal of formula II with an excessive amount of an alcohol of the formula: R OH or R OH or their mixture in the presence of an acidic catalyst until the equilibrium of the reaction is achieved. The acidic catalyst is preferably an acidic ion exchange material, especially preferably the fixed bed of the acidic ion exchange material. The alcohol is preferably methanol. The glyoxal bisacetal, the acidic catalyst and the alcohol are preferably reutilized for the reaction.
Abstract:
The invention relates to methods for producing 4-[aminoalkoxy]benzylamines of general formula (I) by means of catalytic hydrogenation of 4-[aminoalkoxy]benzonitriles of general formula (II). In the compounds of general formulae (I) and (II), R represents C1-C8 alkylene, and R and R independently represent C1-C8 alkyl or are linked to form a ring which can also contain a heteroatom. The hydrogenation is carried out at increased pressure and increased temperatures. The invention also relates to a method for producing the intermediate (II).