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Benzo‐ and indoloquinolizines. XII —carbon‐13 n.m.r. study of the conformation of the 1,2,3,4,4a,6,7,8,9,13b‐decahydro‐9a H ‐pyrido[1,2‐ f ]phenanthridine isomers
Author(s) -
Van Binst G.,
Laus G.,
Tourwé D.
Publication year - 1977
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.1270100104
Subject(s) - phenanthridine , conformational isomerism , chemistry , stereochemistry , crystallography , molecule , organic chemistry
Abstract The influence of the configuration and the conformation on the 13 C n.m.r. spectrum of 1,2,3,4,4a,6,7,8,9,13b‐decahydro‐9a H ‐pyrido[1,2‐ f ] phenanthridine was investigated. These observations, coupled with the low temperature spectrum allowed us to confirm the trans ‐ syn ‐ cis as the preferred conformation for one of the four isomers. At −40°C, 2–3% of another conformer could be detected and identified as the cis ‐ anti ‐ cis ‐2.