Abstract It has been established that a cationic rhodium (I)/(R)-tol-binap complex catalyzes the cross-cyclotrimerization of silylacetylenes, di-tert-butyl acetylenedicarboxylates, and acrylamides with excellent chemo-, regio-, and enantioselectivities. Unsymmetrical alkynoates can also be employed in place of di-tert-butyl acetylenedicarboxylate for this process, but with reduced chemoselectivity.
[Alcock, Simon G.; Baldwin, Jack E.; Bohlmann, Rolf; Harwood, Laurence M.; Seeman, Jeffrey I. Journal of Organic Chemistry, 1985 , vol. 50, # 19 p. 3526 - 3535]
