抄録
With acetamide or acetanilide as the addition agent, 1-phenyl-3-methylpyrazolone or thiobarbituric acid was reacted with orthoformic ester and symmetrical methineoxonol dyes were obtained. Similarly, oxonol dyes were prepared from barbituric acid or 3-ethylrhodanine with cyanoacetic ester as the addition agent or from 4-imidothiobarbituric acid and orthoformic ester with malonic dinitrile as the addition agent. Merocarbocyanin dyes were obtained by the reaction of the oxonol dyes obtained above from the cyclic diketomethylene compound and quaternary salt of heterocyclic bases possessing the methyl group in the 2-position.
