Directive and shielding effects of the trimethylsilyl group. Unprecedented β-selectivity in the reaction of α,β-epoxyalkylsilanes with hindered α-sulphonyl anions
Abstract
Anions generated from hindered primary and secondary alkyl phenyl sulphones react with trimethylsilyloxirane to yield a mixture of products of addition in α- and β-positions or exclusively the product of addition in the β-position.