Organic chemists are continually seeking new reagents for specific and mild formation of carbon-carbon bonds. Organocopper reagents are now becoming widely used in conjugate addition reactions with a, p-unsaturated carbonyl substrates and in coupling reactions with organic halides. We have recently reported formation of methyl and n-alkyl ketones from carboxylic acid chlorides and lithium diorganocuprate (1) reagents, and now we describe ...