172. The existence of aromatic bisnitroso-compounds of the type R′N₂O₂R″

Preparations ofC-Nitroso Compounds

“…It is apparent that the bonding possibilities of the trans-and cis-N 2 O 2 groups are not confined to the production of symmetrical (RNO) 2 dimers, but it was not until 1933 that evidence for the formation of such compounds was produced, 381 when solid-liquid equilibria studies showed that unsymmetrical 1:1 products were formed from mixtures of 2,4,6-trimethylnitrosobenzene (nitrosomesitylene) with 2-nitronitrosobenzene or 2,4-dimethylnitrosobenzene. In addition, cryoscopic measurements in benzene solution showed that 2-methylnitrosobenzene, 2-methoxynitrosobenzene, and phenylnitrosomethane also formed mixed dimers with 2,4,6-trimethylnitrosobenzene.…”