Aldehyde Umpolung by N-Heterocyclic Carbenes: NMR Characterization of the Breslow Intermediate in its Keto Form, and a Spiro-Dioxolane as the Resting State of the Catalytic System

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

WILEY-V C H VERLAG GMBH

1. BASF SE
2. Fonds der Chemischen Industrie