"High cis" 3-[2,2-di(chloro or bromo)-3,3,3- trifluoropropyl]- or 3-[2,2;2-tri(chloro or bromo)ethyl]- 2,2-dimethylcyclopropane-1-carboxylates are obtained by reaction of the corresponding 3,3-dimethyl-4- halogenoheptanoate or ;hexanoate with an alkali metal tert. alkoxide in a nitrile, a pyridine, an ester or a morpholine as solvent.
                            "高顺式 "3-[2,2-二(
氯或
溴)-3,3,3-三氟丙基]-或 3-[2,2;2-三(
氯或
溴)乙基]-2,2-二
甲基环丙烷-1-
羧酸盐是通过相应的 3,3-二甲基-4-卤代
庚酸盐或;
己酸盐与碱
金属叔烷氧基化合物在作为溶剂的腈、
吡啶、酯或吗啉中反应而得到的。