SEARCH Articles Figures Tables Acylations heteroatom-stabilized carbanions Carbanions allylic heteroatom-stabilized Carbanions heteroatom-stabilized Carbanions heteroatom-stabilized species Carbanions heteroatom-substituted Heteroatom-stabilized carbanion Heteroatom-stabilized carbanion species Vinyl carbanions heteroatom substituted