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Antimony pentachloride reacts with a-chloro isocyanates to form l-oxa-3-azabutatriene salts, R2C=N+=C=0 SbCle, 26, which undergo [2+2+2] cycloaddition reactions with disubstituted cyanamides to give 1,3,5-oxadiazinium salts 27. ... [Pg.395]

In the reaction of l-oxa-3-azabutatriene salts with ketones and aldehydes, 2-azaallenium salts and carbon dioxide are obtained... [Pg.396]

See other pages where L-oxa-3-azabutatriene salts is mentioned: [Pg.395] [Pg.396]