摘要:
The present invention is directed to protected amino acid halide monomers and oligomers, and to their use in the efficient sythesis of polyamides. The present invention is further directed to the use of -haloenamine reagents, which may optionally be immobilized, for the preparation of the amino acid halides.
摘要:
A process for the preparation of condensed phosphoric esters extremely lowered in volatiles content, which comprises the first step of reacting a phosphorus oxytrihalide with a bisphenol to prepare a phosphorohalidate, the second step of removing unreacted phosphorus oxytrihalide, and the third step of reacting the phosphorohalidate with a monophenol at a specific ratio.
摘要:
The invention relates to a method for producing phosphoric acid esters, especially a method for producing monomer bridged biaryl diphosphates by adding a water-binding agent to the reaction solution.
摘要:
The present invention provides a process for producing phosphorohalidate characterized in that a crude reaction product obtained by reacting a phosphorus oxyhalide with an aromatic hydroxy compound in the presence of a Lewis acid catalyst is purified by distillation in the presence of an alkali metal salt. The process of the invention produces a high-purity phosphorohalidate in high yield which contains no impurities such as the phosphorus oxihalidate and aromatic hydroxy compound used as starting materials and the catalyst.
摘要:
On prépare des phosphites de diarylalkyle en laissant réagir des dihalophosphites d'alkyle avec un phénol. On prépare les halophosphates de diaryle par halogénation d'un phosphite de diaryl alkyle.
摘要:
Disclosed herein are formulations and methods of manufacture of compounds of formula (E):wherein X and Y independently represent leaving groups; and A + is an ammonium cation.
摘要:
A process for preparation of phosphoric esters which comprises step (1) of reacting phosphorus oxychloride with naphthol at a molar ratio of not larger than 1/1.3 in the presence of a metal halide and removing unreacted phosphorus oxychloride and step (2) of reacting the reaction product of step (1) with phenol at a molar ratio (of chlorine contained in the reaction product to phenol) ranging from 1 : 1 to 1 : 1.5 and removing hydrogen chloride formed by a by-product to thereby obtain a phosphoric ester represented by the general formula (I): (1) wherein n is 1 or 2.
摘要:
A process comprising the first step of reacting a phosphorus oxytrihalide with a bisphenol A derivative at a specific ratio to prepare a phosphorohalidate, the second step of removing unreacted phosphorus oxytrihalide, the third step of reacting the reaction product obtained in the second step with a monophenol at 120°C or below, and the fourth step of reacting the phosphorohalidate with a monophenol at 120°C or above. The condensed phosphoric esters obtained by this process are extremely lowered in the content of isopropenylphenyl diphenyl phosphate, which is causative of a lowering in the heat resistance of a resin and staining of molds occurring in molding a resin, when the condensed phosphoric ester is used as an additive for the resin.