Tetraaminoethylene organic compounds of the generla chemical formula: (R2N)2C=C(NR2)2. Chemistry of tetraaminoethylene These compounds can be formed in the dimerisation reaction of stable diaminocarbenes, a type of stable carbene. Tetraaminoethylenes react with acids to give formamidinium salts. Tetraaminoethylenes react with oxygen to given ureas (R2N)2C=O, with the bis-tetramethyl example (Me2N)2C=C(NMe2)2 emitting a green-blue light upon reaction, and was used by the downed US navy pilot… (More on Tetraaminoethylene)