Abstract
Deprotonated benzotriazole derivatives (la-c) reacted with aldehydes to give the alpha-oxyanion substituted intermediates (2), which upon further treatment with butyllithium, without separation, resulted in the formation of one-carbon homologated a-substituted alkyl ketones (6a-f). Similar treatment of benzotriazole derivatives (1d-f) generated the benzotriazole ring-opening and rearranged products (7a-f). Plausible mechanisms for these reactions have been proposed.