lactones of the cis - 2.2 - of - 3 - (2 '- hydroxy - 2', 2 ', 2' - trihalogenäthyl) - cyclopropan - 1 - carboxylic acid, method for their production and their use for the production of cis - 2.2 - of

摘要

P the invention relates to compounds of formula i: / p