Base-Induced Cyclization of Derivatives of Bispropargylated Acetic Acid to m-Toluic Acid
作者:Tammar Ali、Thorsten Heidelberg、Rusnah Hussen
DOI:10.1055/s-0034-1380513
日期:——
A base-inducedcyclization reaction of 1,1-bispropargyls has been examined. Alkali treatment of 2,2-bispropynyl acetic acid derivatives in aqueous ethanol mostly provided 3-methylbenzoic acid. Investigations on substituent effects indicate the requirement of an electron-withdrawing group causing CH acidity and the center of the dipropargylic structure. Besides, an intramolecular hydrogen transfer causing
Visible Light-Gated Cobalt Catalysis for a Spatially and Temporally Resolved [2+2+2] Cycloaddition
作者:Kyle E. Ruhl、Tomislav Rovis
DOI:10.1021/jacs.6b08792
日期:2016.12.7
materials. Using an external stimulus such as visiblelight to toggle a catalyst between an active and dormant state has proven to be an effective approach for controlled, radical methodologies. Outside of radical bondformation, there is a dearth of evidence that suggests traditional transition metalcatalysis can similarly be controlled with visiblelight energy. Many cobalt complexes that catalyze the