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Substituent effects on C-13 chemical shifts in aliphatic and aromatic series. Proposal of new inductive substitutent parameter (ι; iota) and the application

✍ Scribed by Naoki Inamoto; Shozo Masuda

Publisher: Elsevier Science
Year: 1977
Tongue: French
Weight: 242 KB
Volume: 18
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)83220-2

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✦ Synopsis

In the previous papers, l-3 we reported that the relative substituent C-13 chemical shifts (13C-SCS) of aliphatic and aromatic carbons are mainly controlled by group electronegativity (Xx) showing periodical dependence and to a small extent by resonance-like effect. We now propose a new inductive substituent parameter which is determined based on the atomic properties, in order to interpret 13 C-SCS universally.

Modifying the electronegativity defined by Gordy, 4 we examined empirically

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