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Three‐bond 31 P 31 P coupling and 31 P chemical shift effects in dimers of phospholium salts and phosphole oxides
Author(s) -
Quin Louis D.,
Mesch Keith A.
Publication year - 1979
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270120713
Subject(s) - phosphole , dimer , moiety , chemistry , ion , ring (chemistry) , crystallography , molecule , stereochemistry , organic chemistry
The chemically nonequivalent 31 P nuclei of the Diels‐Alder dimers of phospholium ions and phosphole oxides are coupled through three bonds by as much as 35–45 Hz. The chemical shift for a phosphorus atom in the 2‐phospholene moiety falls in the expected range; the shift for the constricted atom bridging the 6‐membered ring is far downfield, making Δδ as much as 43.5 ppm for one phospholium ion dimer.