85-86 81 a Reaction times are not optimized. Yield of isolated Mixture of E and 2 isomers. product after purification. ketone^,^ 1, 4-diketones $ and other functionalized carbonyl compounds. 6 Their utility is sometimes limited by their susceptibility to hydrolysis, but this problem may be overcome by use of the tert-butyldimethylsilyl derivatives 2.'tert- Butyldimethylsilyl chloride, however, is considerably more expensive than trimethylsilyl ...
