title: Facile synthesis of highly congested 1,2-diphosphinobenzenes from bis(phosphine)boronium salts.
abstract: [Structure: see text] Bis(phosphine)boronium salts 3a-c were designed and prepared as key building blocks for the synthesis of highly congested diphosphinobenzenes. The preparation of sterically hindered ortho-phenylene-bridged diphosphines 1a-c was achieved by the reaction of the bis(phosphine)boronium salts 3a-c with difluorobenzenechromium complex 2 and subsequent removal of the BH2 group. The steric nature of diphosphine 1a was revealed in single-crystal X-ray analysis of its Rh complex.
authors.affiliation: Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, Kagawa 769-2193, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Toru
authors.initials: T
authors.lastname: Koizumi
authors.forename: Kosuke
authors.initials: K
authors.lastname: Katagiri
authors.forename: Yui
authors.initials: Y
authors.lastname: Furuya
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Danjo
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Imamoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Yamaguchi
mesh_terms: D001555:Benzene Derivatives / Q000138:chemical synthesis*; D001896:Boron Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D012492:Salts
chemical_list: D001555:Benzene Derivatives; D001896:Boron Compounds; D012492:Salts