Dispersion and Halogen-Bonding Interactions: Binding of the Axial Conformers of Monohalo- and (±)-<i>trans</i>-1,2-Dihalocyclohexanes in Enantiopure Alleno-Acetylenic Cages
means to study the elusive axial/diaxial conformers. X-ray co-crystal structures of AACs further allowed for a detailed investigation, both experimentally and theoretically, on the interplay between space occupancy, guest conformation, and chiral recognition based purely on dispersion forces and weak C-X···π (X = Cl, Br, I) and C-X···||| (acetylene) contacts (X = Cl, Br). The theoretical analysis of
Site-Selective Aliphatic C–H Bromination Using <i>N</i>-Bromoamides and Visible Light
作者:Valerie A. Schmidt、Ryan K. Quinn、Andrew T. Brusoe、Erik J. Alexanian
DOI:10.1021/ja508469u
日期:2014.10.15
Transformations that selectively functionalize aliphatic C-H bonds hold significant promise to streamline complex molecule synthesis. Despite the potential for site-selective C-H functionalization, few intermolecular processes of preparative value exist. Herein, we report an approach to unactivated, aliphatic C-H bromination using readily available N-bromoamide reagents and visible light. These halogenations
The electrochemical reaction of phenylacetylene with trialkylboranes in a tetrahydrofuran solution containing tetraalkylammonium halide gives the corresponding alkynes via a retention of configuration with respect to the boron-carbon bonds. The reaction mechanism is also discussed.