Abstract: Dialkylcyclopropenones are formed in high yields when alkynes are treated with chloroform-butyllithium in THF at - 78 OC followed by acidic hydrolysis of the dichlorocyclopropene intermediates at low temperatures. ... Cyclopropenones undergo several interesting reactions and they may be ... Modified Favorskii reactions on a,a'-dibromoketones gives ... Another route to cyclopropenones is addition of dichlorocarbeniod reagents to
