On the Counterion Dependence of the Rhodium(I)-Catalysed [4 + 2] Cycloaddition - A Remarkable Accelerating Effect of the Hexafluoroantimonate Anion

Abstract

The choice of electronic environment about the metal atom is crucial to the observed selectivity in the Rh(I)-catalysed [4 + 2] cycloaddition. An account of the influence of the counterion on the rate, diastereo-, enantio- and product selectivity is described.