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Hyperfine Coupling to 13 C Nuclei in Alkyl Substituents—A Contribution to the Problem of CC and CH Hyperconjugation
Author(s) -
Gerson Fabian,
Huber Walter
Publication year - 1985
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198504951
Subject(s) - hyperconjugation , delocalized electron , chemistry , hyperfine structure , coupling (piping) , hyperfine coupling , alkyl , crystallography , photochemistry , radical , molecule , materials science , atomic physics , physics , organic chemistry , metallurgy
A direct comparison of the hyperconjugative delocalization into the CH and CC σ‐bonds has been made by ESR and ENDOR studies of the radical anions 2a, b ⊖⊙ . The experimental findings can be interpreted in terms of hyperconjugative abilities of the CC bonds being smaller than those of the CH bonds,at variance with the previous predictions of MO‐models.