Cheng, Jin-Tang N-Heterocyclic carbene-catalyzed cyclocondensation of 2-aryl carboxylic acids and enones: highly enantioselective synthesis of δ-lactones. [electronic resource] - Organic & biomolecular chemistry Feb 2015 - 1313-6 p. digital Publication Type: Journal Article ISSN: 1477-0539 Standard No.: 10.1039/c4ob02330g doi