Ru‐ and Rh‐Catalyzed CC Bond Cleavage of Cyclobutenones: Reconstructive and Selective Synthesis of 2‐Pyranones, Cyclopentenes, and Cyclohexenones

Abstract

η4-Vinylketene and/or metallacyclopentenone complexes can be considered key intermediates in the ruthenium- and rhodium-catalyzed ring-opening dimerization of cyclobutenones to give 2-pyranones as well as in the rhodium-catalyzed coupling reactions of cyclobutenones with 2-norbornene (see scheme). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z461002_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.