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Long range 13 C 13 C coupling constants. A review
Author(s) -
Hansen Poul Erik
Publication year - 1978
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.1270110502
Subject(s) - coupling constant , coupling (piping) , range (aeronautics) , substituent , computational chemistry , chemistry , carbon 13 , physics , order (exchange) , stereochemistry , materials science , nuclear physics , quantum mechanics , finance , economics , metallurgy , composite material
A large number of 13 C 13 C coupling constants from a diversity of compounds are now available. Attempts have been made to classify this information in order to illustrate how these data are obtained, how signs are determined and how both two‐ and three‐bond couplings can lead to structural information. Coupling constants in aromatic compounds are now well documented, substituent effect trends have been established and correlations with bond orders are noticed. Comparison of 13 C 13 C couplings with 13 C 1 H couplings is mentioned. Theoretical calculations are dealt with, and these can now be properly evaluated as both magnitudes and signs of the experimental couplings are known. Finally, the occurrence of long range couplings in biosynthetic material is briefly surveyed.