One‐bond 13 C, 13 C‐spin‐coupling constants have been measured, with natural isotope abundance, in η 4 ‐diene, η 3 ‐allyl and η 2 ‐ene transition‐metal carbonyl complexes. Typical values of 1 J (C,C) are given for Fe‐, Ru‐ and Os‐complexes with the three types of olefinic ligands. The effects of substituents and the structural significance of the C,C‐coupling constants are discussed.
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Zobl‐Ruh et al. (1981) studied this question.
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