N. Katagiri et al., A NOVEL SYNTHESIS OF CYCLIC NITRONES VIA A NITROSOKETENE INTERMEDIATE, Journal of the Chemical Society, Chemical Communications, (3), 1994, pp. 281-282
Nitrosoketene generated by thermolysis of hydroxyimino Meldrum's acid
1 reacts with various ketones including the chiral ketone (+)-nopinone
to produce cyclic nitrones 2-5 as novel 1,3-dipolar molecules.