Observation of two oxa-azabicyclo [2.2. 0] hexenone intermediates along the reaction pathway of the photochemical isomerization of 1, 3-oxazin-6-ones

…, AC Weedon, RW Zabel

Index: Mayo, Paul de; Weedon, Alan C.; Zabel, Ralph W. Canadian Journal of Chemistry, 1981 , vol. 59, p. 2328 - 2333

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Abstract

Irradiation of 4-methyl-2-phenyl-1, 3-oxazin-6-one, 1, yields a photochemical equilibrium between 1 and 2-methyl-4-phenyl-1, 3-oxazin-6-one, 2. The isomerization proceeds through two intermediates, the oxa-azabicyclo [2.2. 0] hexenones 3 and 4, both of which can be observed spectroscopically (ir, uv, 1H nmr) at low temperature.