The activation barrier to axial torsion in 2,2'-bis(diphenylphosphino)biphenyl
Desponds, Olivier; Schlosser, M.
1996

Abstract

After selective deuteration of 2,2'-bis(diphenylphosphino)biphenyl, it was possible to det. the NMR coalescence temp. of the diastereotopic Ph groups. On this basis, a torsional barrier of 22 kcal/mol was calcd. Thus, the bisphosphine, even if it could be resolved into pure enantiomers, would rapidly re-racemize at temps. around or >25 Deg. [on SciFinder (R)]

Details

Title The activation barrier to axial torsion in 2,2'-bis(diphenylphosphino)biphenyl
Author(s) Desponds, Olivier ; Schlosser, M.
Published in Tetrahedron Letters
Volume 37
Issue 1
Pages 47-8
Date 1996
ISSN 0040-4039
Keywords
Note CAN 124:202421
29-7
Organometallic and Organometalloidal Compounds
Institut Chimie Organique,Universite Batiment Chimie,Lausanne-Dorigny,Switz.
Journal
written in English.
174467-54-0 Role: RCT (Reactant), RACT (Reactant or reagent) (deuterium exchange reaction of); 174467-53-9P Role: PEP (Physical, engineering or chemical process), PRP (Properties), SPN (Synthetic preparation), PREP (Preparation), PROC (Process) (prepn. and temp.-dependent NMR and racemization potential barrier of); 174467-52-8 Role: PEP (Physical, engineering or chemical process), PRP (Properties), PROC (Process) (temp.-dependent NMR and torsional potential barrier of)
DOI https://doi.org/10.1016/0040-4039(95)02080-2
Laboratories LSCO
Record Appears in Scientific production and competences > SB - School of Basic Sciences > SB Archives > LSCO - Laboratory of Organic Synthesis and Catalysis
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2006-03-03