## Abstract The ^13^C NMR spectra of the antileukemic ansa macrolide maytansine and eight naturally occurring homologues were recorded. Signals were assigned to specific carbon atoms of the ansa macrolide ring and C‐3 ester side chain using data from off‐resonance decoupling, single frequency decou
Carbon-13 NMR studies of a series of benzylphenols
✍ Scribed by Yoshimi Nakai; Fukiko Yamada
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 425 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Carbon‐13 NMR spectra of a series of benzylphenols and their O‐alkylated derivatives were recorded to find the substituent effects of the benzyl, hydroxybenzyl and alkoxybenzyl groups on the ^13^C chemical shifts. It was found that the methylene bridge carbons show signal shifts mainly due to the mesomeric effects of the OH and OCH~3~ substituents, and that in the case of ortho‐substituted benzyl compounds, the methylene carbon signals exhibit upfield shifts due to both mesomeric and steric effects.
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