The activation barrier to axial torsion in 2,2'-bis(diphenylphosphino)biphenyl

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)]


Published in:
Tetrahedron Letters, 37, 1, 47-8
Year:
1996
Keywords:
Note:
CAN 124:202421
29-7
Organometallic and Organometalloidal Compounds
Institut Chimie Organique,Universite Batiment Chimie,Lausanne-Dorigny,Switz.
Journal
0040-4039
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)
Laboratories:




 Record created 2006-03-03, last modified 2018-01-27


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