bromo compounds are brilliant yellow, the iodo derivatives are somewhat deeper in color and the nitro substitution products are yellow to goldenbrown. They are insoluble in water, slightly soluble in alcohol and most organic solvents, but are easily purified by recrystallization from acetic acid. They dissolve readily in coned, sulfuric acid with the production of brilliant red colors. Melting points were determined with short-scale thermometers and the mercury column totally immersed.Measurements of the absorption of these compounds in acetic acid by Walter C. Holmes indicate that the maximum absorption occurs too far in the red end of the spectrum to allow use of direct absorption measurement methods.Summary 5-Bromo-, 5-chloro-, 5-iodo-and 5-nitrovanillins have been condensed with the isomeric 2-thio-3-tolyl-4-thiazolidones.

No abstract

No abstract

No abstract

No abstract