1,2-Oxazine chemistry. Part 6. Conformational analysis of cyclohexene and a heterocyclic analogue by 13C nuclear magnetic resonance spectroscopy
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 5,p. 619-622
- https://doi.org/10.1039/p29770000619
Abstract
The 13C n.m.r. spectra of twenty-six 3,6-dihydro-1,2-oxazines are reported. A multiple linear regression analysis of the substituent effects on the shifts of the ring carbon atoms gives results similar to those found with cyclohexene, suggesting conformational similarities between these ring systems. It is inferred from the results that alkyl groups at positions 3 and 4 in a cyclohexene-like system largely prefer the equatorial position.Keywords
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