申请人:Kyowa Hakko Kogyo Co., Ltd.
公开号:US04816602A1
公开(公告)日:1989-03-28
Process for the production of cycloalkanecarboxylic acids of general Formula I ##STR1## wherein n means the number 1 or 2, R.sub.1 and R.sub.3 are alkyl groups of 1-4 carbon atoms, and R.sub.2 and R.sub.4 symbolize hydrogen atoms or alkyl groups of 1-4 carbon atoms, characterized by reacting a compound of general Formula II X--CR.sub.1 R.sub.2 --(CH.sub.2).sub.n --CH.sub.2 --CR.sub.3 R.sub.4 --X'(II), wherein n, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the meanings given above and X and X' mean a hydroxy group, a chlorine atom, a bromine atom, an alkylsulfonyloxy residue, or an arylsulfonyloxy residue, with 1,1-dichloroethylene; splitting off hydrogen chloride from the thus-obtained compounds of general Formula III X--CR.sub.1 R.sub.2 --(CH.sub.2).sub.n --CH.sub.2 --CR.sub.3 R.sub.4 --CH.sub.2 --CCl.sub.2 X (III), wherein n, X, X', R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the meanings given above; and cyclizing and hydrolyzing, by means of acids, the thus-prepared compounds of general Formula IV X--CR.sub.1 R.sub.2 --(CH.sub.2).sub.n --CH.sub.2 --CR.sub.3 R.sub.4 --CY.dbd.CZX' (IV), wherein n, X, X', R.sub.1, R.sub.2, R.sub.3 and R.sub.4 have the meanings given above, and Y and Z jointly represent a carbon-to-carbon bond or mean a hydrogen atom and a chlorine atom.
一般式为I的环烷基羧酸的生产过程,其中n表示数字1或2,R1和R3是1-4个碳原子的烷基基团,R2和R4表示氢原子或1-4个碳原子的烷基基团,其特征在于将一般式II的化合物X-CR1R2-(CH2)n-CH2-CR3R4-X'(II)与1,1-二氯乙烯反应;从得到的一般式III的化合物X-CR1R2-(CH2)n-CH2-CR3R4-CH2-CCl2X(III)中分离氢氯酸;通过酸的手段使得一般式IV的化合物X-CR1R2-(CH2)n-CH2-CR3R4-CY= CZX'(IV)环化和水解,其中n,X,X',R1,R2,R3和R4具有上述给定的含义,Y和Z共同表示碳到碳的键或表示氢原子和氯原子。