摘要:
The present invention provides a silicone polymer production method that can achieve a significantly improved yield due to the needlessness of a rinsing step and can produce a stable a silicone polymer. The production method for a silicone polymer includes a step for preparing at least one silane compound selected from the compounds represented by the general formula (1); R a Si(OR 1 ) 4-a (1) (wherein R is a hydrogen atom or a monovalent organic group, R 1 is a monovalent organic group, and a is an integer of 1 or 2) and the compounds represented by the general formula (2); Si(OR 2 ) 4 (2) (wherein R 2 is a monovalent organic group), a step for hydrolyzing it with a quaternary ammonium compound in the presence of water, and a step for bringing it into contact with a cation exchange resin.
摘要:
The halogen-terminated sulfur-containing polymer of the present invention is a halogen-terminated sulfur-containing polymer represented by the following formula: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒX-(R-S r ) n -R-X wherein R is an ether bond-containing alkyl group having 3 to 26 carbon atoms, X is a halogen atom, n is an integer of 1 to 200, and r has an average of 1 to 5. The halogen-terminated sulfur-containing polymer of the present invention is industrially very useful as a plasticizer of a polysulfide polymer. In addition, the halogen-terminated sulfur-containing polymer of the present invention can be used as a plasticizer for thioether polymers and high polar resins such as vinyl chloride, and an additive for materials that require a high refractive index such as an optical fiber. The halogen-terminated sulfur-containing polymer of the present invention is effective as an intermediate of a thiol group-terminated polysulfide polymer and the like.
摘要:
The present invention provides a method for purifying dimethyl sulfoxide economically and at good yield so as to satisfy the specifications of the United States Pharmacopoeia and reduce odor. The method is characterized in that a solution having 35 parts by weight or more of water admixed per 100 parts by weight of raw dimethyl sulfoxide is distilled.
摘要:
The present invention is a method for producing optically active trans-1,2-diaminocyclohexane, in which a crystal of optically active trans-1,2-diaminocyclohexane is obtained by crystallization from a solution of optically active trans-1,2-diaminocyclohexane. According to the present invention, optically active trans-1, 2-diaminocyclohexane with high purity is obtained in a favorable yield from a solution of optically active trans-1,2-diaminocyclohexane. The optically active trans-1,2-diaminocyclohexane with high purity, which is produced by a method for producing optically active trans-1,2-diaminocyclohexane of the present invention, is useful as a raw material for a large number of medicines.
摘要:
A method of producing optically active trans-2-aminocyclohexanol includes allowing racemic trans-2-aminocyclohexanol to react with optically active 2-methoxyphenylacetic acid to produce an optically active 2-methoxyphenylacetic acid salt of optically active trans-2-aminocyclohexanol and separating the salt. An optically active 2-methoxyphenylacetic acid salt of optically active trans-2-aminocyclohexanol is also provided. The method makes it possible to produce optically active trans-2-aminocyclohexanol with ease and a high yield from an industrially-advantageous, inexpensive raw material.
摘要:
The present invention is a method for producing of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, wherein 2,2'-bis(trifluoromethyl)biphenyl is produced from o-chlorobenzotrifluoride, further, 2,2'-bis(trifluoromethyl)biphenyl is dinitrated in 1,2-dichloropropane solution, and 2,2'-bis(trifluoromethyl)-4,4'-dinitrobiphenyl is isolated and reduced. The method for producing of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl of the present invention is an industrially excellent method for producing with high safety and high production efficiency.
摘要:
When a salt of an amine and an optically active diacyltartaric acid, or a diastereomer salt of an optically active amine and an optically active diacyltartaric acid, obtained by optically resolving a racemic amine using the optically active diacyltartaric acid, is salt-exchanged with an acid aqueous solution, the optically active diacyltartaric acid is added in the acid aqueous solution beforehand. Furthermore, a raw material containing a racemic amine and an optically active diacyltartaric acid is optically resolved, and the diastereomer salt of the optically active amine and the optically active diacyltartaric acid respectively of one isomer type, is separated. The obtained diastereomer salt is dissociated using an acid aqueous solution containing the optically active diacyltartaric acid, for recovering the optically active diacyltartaric acid, and the obtained' optically active diacyltartaric acid is recycled into an optical resolution step as a raw material of the optical resolution step.