申请人:BASF Aktiengesellschaft
公开号:US04837357A1
公开(公告)日:1989-06-06
2,2-Disubstituted 3-chloropropionic esters I ##STR1## where R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -oxaalkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -oxaalkenyl, aryl or C.sub.7 -C.sub.12 -aralkyl or R.sup.1 -C-R.sup.2 is 5-, 6- or 7-membered ring, R.sup.3 is C.sub.2 -C.sub.6 -oxaalkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -oxaalkenyl or C.sub.7 -C.sub.12 -aralkyl, are prepared by converting 2,2-disubstituted 3-hydroxypropanals II ##STR2## into the esterdiol III ##STR3## reacting this esterdiol III in the presence of a transesterification catalyst with an alcohol R.sup.3 OH to give the 3-hydroxyester IV ##STR4## reacting the hydroxyester IV with a stoichiometric or greater than stoichiometric amount of the thionyl chloride and thermally decomposing the product to give the chloropropionic ester I.
2,2-二取代的3-氯丙酸酯I,其中R.sup.1和R.sup.2分别是每个C.sub.1 -C.sub.6-烷基,C.sub.2 -C.sub.6-氧杂烷基,C.sub.2 -C.sub.6-烯基,C.sub.2 -C.sub.6-氧杂烯基,芳基或C.sub.7 -C.sub.12-芳基烷基或R.sup.1-C-R.sup.2为5、6或7-成员环,R.sup.3是C.sub.2 -C.sub.6-氧杂烷基,C.sub.2 -C.sub.6-烯基,C.sub.2 -C.sub.6-氧杂烯基或C.sub.7 -C.sub.12-芳基烷基,通过将2,2-二取代的3-羟基丙醛II转化为酯二醇III,然后在酯二醇III存在酯交换催化剂的情况下与醇R.sup.3 OH反应以得到3-羟基酯IV,再将羟基酯IV与亚砜氯的化学计量量或大于化学计量量反应,并热分解产物以得到氯丙酸酯I。