Divergent mechanisms for the skeletal rearrangement and [2+2] cycloaddition of enynes catalyzed by gold
C. Nieto-Oberhuber, S. López, M. P. Muñoz, D. J. Cárdenas, E. Buñuel, C. Nevado, A. M. Echavarren
Angew. Chem. Int. Ed. 2005, 44, 6146-6148
Abstract: Cyclobutenes are not necessary intermediates in the skeletal rearrangement of enynes, which is supported DFT calculations and kinetic studies. Cyclobutenes may arise from the corresponding syn-cyclopropyl gold(I) carbenes.