And >- CH, the first characterizing the polymethylene and reduced heterocyclic compounds, the second true aromatic compounds.
A great impetus was given to the study of polymethylene derivatives by the important and unexpected observation made by W.
Other hydrocarbon nuclei generally classed as aromatic in character result from the union of two or more benzene nuclei joined by one or two valencies with polymethylene or oxidized polymethylene rings; instances of such nuclei are indene, hydrindene, fluorene, and fluoranthene.
His chief researches deal with the polymethylene compounds, the alkaloids, in particular hydrastine and berberine, and the camphors and terpenes.
Zelinsky, Ber., 1901, 34, p. 3 2 49); and by eliminating the halogen acid from monoor di-halogen polymethylene compounds by heating them with quinoline.