Facile synthesis of highly congested 1,2-diphosphinobenzenes from bis(phosphine)boronium salts.
[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.
Yamamoto
Yoshikazu
Y
Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, Kagawa 769-2193, Japan.
Koizumi
Toru
T
Katagiri
Kosuke
K
Furuya
Yui
Y
Danjo
Hiroshi
H
Imamoto
Tsuneo
T
Yamaguchi
Kentaro
K
D001555:Benzene Derivatives / Q000138:chemical synthesis*; D001896:Boron Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D012492:Salts
D001555:Benzene Derivatives; D001896:Boron Compounds; D012492:Salts