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Carbon-13 n.m.r. studies of some saturated 1,2-oxazepine derivatives

✍ Scribed by Kenner C. Rice; Roderick E. Wasylishen

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
475 KB
Volume
8
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The influence of incorporating an group, an oxygen atom and the fragment in a saturated 7‐membered ring system on carbon‐13 n.m.r. chemical shifts is examined, and also, the influence of the dioxolane ring moiety on the ^13^C chemical shifts in these ring systems. Substituent effects are generally additive except in cases where the ring is heavily substituted with methyl groups. A large upfield steric shift (γ effect) of 7–8 ppm is observed in two of the derivatives. An example of long range nonequivalence is also observed. Assignments of the ^13^C n.m.r. spectra have been made by comparison with model compounds, and from proton coupled ^13^C n.m.r. spectra. The synthesis of several new compounds is described.

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