Method C. A mixture of 0.26 g (1.50 mmol) of 1-(thiopivaloy1) pyrrolidine and 0.42 g (1.80 mmol) of a-cyanoisobutyl trifluoromethanesulfonate was stirred for 0.5 h and allowed to stand 18 h under a nitrogen atmosphere. Sulfur extrusion, hydrolysis, and isolation proceeded as described in method A to yield 0.20 g (80%) of y, y-dimethyl-a-isopropyl-,! 3- oxovaleronitrile.
