The (-) (-) diastereoisomers of the .alpha.-cyano-3-phenoxybenzyl and .alpha.-ethynyl-3-phenoxybenzyl esters of 1-(4-ethoxyphenyl)-, 1-(4-chlorophenyl)-, and 1-(3,4-methylenedioxyphenyl)-2,2,3,3-tetrafluorocyclobutane carboxylic acid.
1-(4-乙氧基苯基)-、1-(4-
氯苯基)-和1-(3,4-亚甲二氧基苯基)-2,2,3,3-四
氟环丁烷羧酸的.alpha.-
氰基-3-苯氧基苄基和.alpha.-
乙炔基-3-苯氧基苄基的(-)-(-)对映异构体。