With dicyanoselenane

Involvement of the catalyst has been observed in the reaction of excess HFA with dicyanoselenane. A bicyclic compound is formed with one dioxazine ring attached to selenium, the other ring being generated by complete dehydrogenation of an ethyl group (240). The X-ray structure of 141 has been reported. 

Dicyanocuprate(I) complexes, 17 119 Dicyanoselenane, reaction with hexafluoroace-tone, 30 278... 

HFA has been reacted with a series of dicyanosulfanes NCS CN (n = 1 -4) under the catalytic action of triethylamine. The monosulfane produces a red oil which shows extensive decomposition during attempts of purification (176). Spectral data suggest formation of a A -l,3,5-dioxazine ring system as has been found in the reactions of the homologous dicyanoselenane [Eq. (116)] and thiocyanogen with HFA, which results in compound 140. The X-ray structure has been reported. A remarkable feature is the stability of the... 

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