α-Trifluoromethylmethylene and α-Trifluoromethylethylidene γ-Butyrolactones.

Abstract Trifluoromethylation of iodoalkylidene lactones can be achieved stereospecifically via zinc organocuprate reagents to yield a new series of α-triflouromethylalkylidene-γ-butyrolactones.