摘要:
In hexane, i.e. under heterogeneous conditions, 1,(omega-1)-dienes readily undergo double deprotonation to give bis(allylmetal) intermediates. In tetrahydrofuran at - 75 or - 50-degrees-C, however, only monometalation occurs with dienes having chains of up to 12 carbon atoms. The practical potential of such selective monosubstitution reactions is demonstrated by two novel pheromone syntheses.