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Some α‐ and β‐halonitrosoalkenes1have been synthesized and characterized. The halogen atoms of the oxime precursors2can be substituted by alkoxy groups. Two kinds of cycloaddition reaction of1have been observed: (i) reaction of the NO group with dienes gives 3, 6‐dihydrooxazine derivatives6which isomerise to epoxyepimines7in most cases of β‐substituted nitrosoalkenes; (ii) if 4, 5‐dihydrooxazines22are obtained, the cycloaddition of the nitrosoalkenes as 4π‐component is presumed.
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Francotte et al. (1981) studied this question.
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