Facile Synthesis of Highly Congested 1,2-Diphosphinobenzenes from Bis(phosphine)boronium Salts

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 d...

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Published inOrganic letters Vol. 8; no. 26; pp. 6103 - 6106
Main Authors Yamamoto, Yoshikazu, Koizumi, Toru, Katagiri, Kosuke, Furuya, Yui, Danjo, Hiroshi, Imamoto, Tsuneo, Yamaguchi, Kentaro
Format Journal Article
LanguageEnglish
Published WASHINGTON American Chemical Society 21.12.2006
Amer Chemical Soc
Subjects
Benzene Derivatives - chemical synthesis
Boron Compounds - chemistry
Chemistry
Chemistry, Organic
Crystallography, X-Ray
Physical Sciences
Salts
Science & Technology
EFFICIENT PROCEDURE
LIGANDS
PALLADIUM COMPLEXES
ALPHA-ARYLATION
METHOXYCARBONYLATION
CATALYSTS
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Summary: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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1523-7060
1523-7052
DOI:10.1021/ol062717i