Dramatic effect of substituents and TMEDA additive on the regioselectivity of directed orthometalation of tetrasubstituted aromatics
摘要:
The regioselectivity of the directed orthometalation of terrasubstituted aromatic N,N-diethylamides was found to depend of the ring substituents and of the base used A dramatic effect of the additive TMEDA to s-butyllithium has been observed which could be explained in terms of steric bulk.