| 摘要 |
1. Process for the preparation of sulphinates of the general formula see diagramm : EP0005251,P5,F1 in which A and B independently of one another denote an optionally substituted 1,4-arylene radical and R1 , R2 , R3 and R4 independently of one another denote hydrogen or an optionally substituted alkyl, cycloalkyl, aralkyl or aryl radical, or R1 and R2 , and R3 and R4 , together with the adjacent nitrogen atom, form a heterocyclic ring or one or more of the radicals R1 , R2 , R3 and R4 , with the nitrogen and an adjacent carbon atom of radical A or B, form a heterocyclic ring, and D represents an optionally substituted alkyl, aryl, aralkyl, cycloalkyl or heteryl radical, by reacting 4,4'-diaminobenzhydrols of the general formula see diagramm : EP0005251,P5,F4 with compounds of the general formula D-SO2 H or alkali metal salts or alkaline earth metal salts thereof under anhydrous conditions in aliphatic monocarboxylic or dicarboxylic acids and optionally other organic solvents, characterised in that the sulphinates are precipitated by diluting them with anhydrous organic solvents. |
