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Carbon-13 NMR. The analysis of the relaxation times T1 of benzofuran and of a series of its methyl derivatives. Correlations between molecular motions and structural properties

✍ Scribed by Nicole Platzer

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
544 KB
Volume
11
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Carbon‐13 relaxation times (T~1~) and nuclear Overhauser enhancements (η) have been measured for benzofuran and a series of its methyl derivatives. The contributions of dipolar (T~1~ ^DD^) and spin rotation (T~1~^SR^) mechanisms have both been determined. The temperature dependence of T~1~ has been studied. The relationships between molecular motions and structural properties have been emphasized. The overall motional anisotropy of the benzofuran molecule is increased by substitution in positions 2 and 5. The internal rotation of a methyl group may change depending on its position in the molecule and on the influence of other methyl groups in its close neighbourhood.

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