A suboxide, Na 3 0, appears to be formed as a grey mass when a clean surface of the metal is exposed to air, or when pure air is passed through the metal just above its melting point (De Forcrand, Compt.
Three oxides of carbon are known, namely, carbon suboxide, C,02, carbon monoxide, CO, and carbon dioxide, C02.
Carbon suboxide, C302, is formed by the action of phosphorus pentoxide on ethyl malonate (0.
A suboxide, Ni 2 O (?), described by W.
Two classes may be distinguished: the aldo-ketenes, including ketene itself, together with its monoalkyl derivatives and carbon suboxide, and the keto-ketenes which comprise the dialkyl ketenes.