Origin of the Stabilization of Vinyldiazonium Ions by β-Substitution; First Crystal Structure of an Aliphatic Diazonium Ion: β,β-Diethoxyethene-diazonium Hexachloroantimonate

The considerable contributions of the O-stabilized mesomeric resonance structures III and IV probably account for the extraordinary stability of the cation of the title compound and related systems. This is apparent from comparisons of the bond lengths and angles of the first experimentally determined structure with the results of ab initio studies. The title compound is prepared by alkylation of diazoacetate with triethyloxonium hexachloroantimonate.