Liquid enol ethers and acetates as gaseous alkyne equivalents in Rh-catalyzed chemo- and regioselective formal cross-alkyne cyclotrimerization

A cationic rhodium(l)/rac-BINAP complex catalyzes chemo- and regioselective formal cross-cyclotrimerizations of alkynes with enol ethers or acetates. Commercially available and cheap liquid enol ethers and acetates could be used as convenient gaseous alkyne equivalents in the present rhodium catalyses.