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Nuclear Quadrupole Resonance and Stereochemistry III. Trichloromethyl derivatives
Author(s) -
Ardalan Ziba,
Lucken Edwin A. C.
Publication year - 1973
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19730560532
Subject(s) - chemistry , conjugated system , chlorine , chlorine atom , moiety , nuclear quadrupole resonance , molecule , resonance (particle physics) , hyperconjugation , radical , quadrupole , group (periodic table) , medicinal chemistry , stereochemistry , computational chemistry , photochemistry , organic chemistry , nuclear magnetic resonance , physics , atomic physics , polymer , particle physics
35 Cl nuclear quadrupole resonance frequencies are reported of the chlorine atoms in the trichloromethyl group of benzotrichlorides and trichloromethyl derivatives of heterocyclic molecules. They are compared with previously reported results for the same group attached to other planar conjugated radicals. In such compounds the three chlorine atoms cannot be equivalent and all the results are discussed from the point of view of possible orientation‐dependant hyperconjugation between the CCl bonds and the conjugated moiety, particularly with reference to the marked effects observed in trichloromethyl ethers reported in part I of this series. In the benzo‐trichloride and indeed most of the compounds discussed such effects are small.