Alkylpalladium(II) species. Reactive intermediates in a bis-cyclisation route to strained polyfused ring systems

Article abstract of DOI:10.1016/S0040-4039(00)79396-8

4-Alkenyl-allylic and-vinylic acetates or bromides undergo Pd(0) catalysed bis-cyclisation via an initial 5- or 6-exo-trig ring closure generating an alkylpalladium(II) intermediate which reacts further via a 3-, 4- or 5-exo-trig cyclisation onto a proxim