ACTIVATION OF MIXED CARBOXILIC α-BROMOTOLUOYL ANHYDRIDES BY SILVER TETRAFLUOROBORATE. SYNTHESIS OF ESTERS AND THIOL ESTERS
Mixed carboxylic α-bromotoluoyl anhydrides were activated by silver tetrafluoroborate through intramolecular cyclization and reacted with alcohols or thiols giving the corresponding esters or thiol esters in good yields with the elimination of phtalide.
ACTIVATION OF CARBOXYLIC ACIDS AND ALCOHOLS BY INTRAMOLECULAR CYCLIZATION. ACYLATION OF TRIMETHYLSYSLILACETYLENES AND ALKYLATION OF AROMATIC COMPOUNDS
Carboxylic α-bromo-o-toluic anhydrides and alkyl α-bromo-toluates were activated by silver salts and used for the acylation of trimethylsilylacetylenes to acetylenic ketones and alkylation of aromatic compounds, respectively.