Dyes Derived from Substituted Phthalic Acids. Part III. cis-∆4- Tetrahydrophtbalic Acid. Effect of Decreasing Unsaturation in the Phthalic Acid Portion ot Phthalein Dyes

cis-∆4-Tetraly dr ophthalio anhydride has been prepared and condensed with a number of aromatic hydrozy (phenols) and hydroxya mina (\(m\)-diethylaminopheno” compounds. The phthalein and rhodamine types of compounds, time obtained, have been stuided analytically and spectrophotometrically. The resorcinol compound has also been brominated and acetylated. The effect of decreasing unsaturation in the phthalic acid portion of phthaleins has been studied.