title: Catalytic Use of Elemental Gallium for Carbon-Carbon Bond Formation.
abstract: The first catalytic use of Ga(0) in organic synthesis has been developed by using a Ag(I) cocatalyst, crownether ligation, and ultrasonic activation. Ga(I)-catalyzed C-C bond formations between allyl or allenyl boronic esters and acetals, ketals, or aminals have proceeded in high yields with essentially complete regio- and chemoselectivity. NMR spectroscopic analyses have revealed novel transient Ga(I) catalytic species, formed in situ through partial oxidation of Ga(0) and B-Ga transmetalation, respectively. The possibility of asymmetric Ga(I) catalysis has been demonstrated.
authors.affiliation: The University of Edinburgh , EaStCHEM School of Chemistry, The King's Buildings, David Brewster Road, EH9 3FJ Edinburgh, U.K.
authors.forename: Bo
authors.initials: B
authors.lastname: Qin
authors.affiliation: The University of Edinburgh , EaStCHEM School of Chemistry, The King's Buildings, David Brewster Road, EH9 3FJ Edinburgh, U.K.
authors.forename: Uwe
authors.initials: U
authors.lastname: Schneider