Premium
Carbon‐13 nuclear magnetic resonance spectra of exo ‐ and endo ‐2‐norbornyltrimethyl‐stannanes: Corrected assignments
Author(s) -
Kitching William
Publication year - 1982
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.1270200211
Subject(s) - spectral line , chemistry , nmr spectra database , nuclear magnetic resonance , polarization (electrochemistry) , crystallography , stereochemistry , analytical chemistry (journal) , physics , organic chemistry , astronomy
The 13 C NMR spectra of pure exo ‐2‐norbornyltrimethylstannane and a mixture of the exo ‐ and endo ‐isomers have been recorded. 1 H– 13 C polarization transfer spectra have been obtained and require the previously reported assignments for C‐3 and C‐4 in the exo ‐isomer to be reversed. The reported assignments for the endo ‐isomer are correct. The new assignment for C‐4‐ exo [with J ( 119 Sn, 13 C) vic=12 Hz, instead of the previously assigned J ( vic )=23 Hz], has a very minor effect on the nature of the Karplus curve [for 3 J ( 119 Sn, 13 C)] generated previously.