title: Crossed intermolecular [2+2] cycloadditions of acyclic enones via visible light photocatalysis.
abstract: Efficient [2+2] heterodimerizations of dissimilar acyclic enones can be accomplished upon visible light irradiation in the presence of a ruthenium(II) photocatalyst. Similar cycloadditions under standard UV photolysis conditions are inefficient and unselective. Nevertheless, a diverse range of unsymmetrical tri- and tetrasubstituted cyclobutane structures can be produced in good yields and excellent diastereoselectivities using this new method. The reaction is promoted by any visible light source, and efficient, gram-scale cycloadditions can be conducted upon irradiating with ambient sunlight.
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53705, USA.
authors.forename: Juana
authors.initials: J
authors.lastname: Du
authors.forename: Tehshik P
authors.initials: TP
authors.lastname: Yoon
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D007659:Ketones / Q000737:chemistry*; D008027:Light; D055668:Photochemical Processes
chemical_list: D000475:Alkenes; D007659:Ketones