申请人:Ciba-Geigy Corporation
公开号:US04727187A1
公开(公告)日:1988-02-23
The present invention relates to a novel process for the preparation of an .alpha.,.alpha.-difluoroalkyl phenyl ether of formula I ##STR1## wherein R.sup.1 is hydrogen, halogen, amino, nitro, --SO.sub.2 --R.sup.4, --S--R.sup.5, --SO--R.sup.6 or --S--S--R.sup.7, R.sup.2 is hydrogen, halogen, nitro, hydroxy or --SO.sub.2 --R.sup.8, R.sup.3 is C.sub.1 -C.sub.5 haloalkyl, X is oxygen, sulfur, --SO-- or --SO.sub.2 --, R.sup.4 is hydroxy, halogen, amino, --N.dbd.C.dbd.O, --NH--CO--Cl, --NH--CO--Br, --NR.sup.9 R.sup.10, benzyl, phenyl, C.sub.1 -C.sub.4 alkyl or --NH'CO--NR.sup.11 R.sup.12, R.sup.5 and R.sup.6 are C.sub.1 -C.sub.4 alkyl, phenyl or benzyl, R.sup.7 is C.sub.1 -C.sub.4 alkyl, phenyl or benzyl, R.sup.8 is hydroxy or halogen, R.sup.9 and R.sup.10 are each independently of the other C.sub.1 -C.sub.4 alkyl or benzyl and R.sup.11 and R.sup.12 are each independently of the other hydrogen, C.sub.1 -C.sub.4 alkyl, phenyl or an aromatic heterocycle, which process comprises fluorinating a compound of formula II ##STR2## wherein R.sup.1 R.sup.2, R.sup.3 and X are as defined for formula I, with hydrogen fluoride, in the presence of a catalytic amount of an antimony(V) compound. The intermediate of formula III ##STR3## obtained when carrying out said process may, if desired, be isolated by selecting suitable reaction conditions.
本发明涉及一种新型的制备α,α-二氟烷基苯醚的方法,其化学式为I
其中,R1为氢、卤素、氨基、硝基、--SO2--R4、--S--R5、--SO--R6或--S--S--R7,R2为氢、卤素、硝基、羟基或--SO2--R8,R3为C1-C5卤代烷基,X为氧、硫、--SO--或--SO2--,R4为羟基、卤素、氨基、--N.dbd.C.dbd.O、--NH--CO--Cl、--NH--CO--Br、--NR9R10、苄基、苯基、C1-C4烷基或--NH'CO--NR11R12,R5和R6为C1-C4烷基、苯基或苄基,R7为C1-C4烷基、苯基或苄基,R8为羟基或卤素,R9和R10各自独立地为C1-C4烷基或苄基,R11和R12各自独立地为氢、C1-C4烷基、苯基或芳香族杂环。该方法包括在五价锑化合物的催化下,用氢氟酸氟化化合物II的步骤,其中化合物II的化学式为
其中,R1、R2、R3和X如化学式I所定义。在实施该方法时,所得到的化合物III的中间体
可根据选择合适的反应条件进行分离。