phthalein definition

  • noun:
    • some of a team of compounds formed by a reaction of phthalic anhydride with a phenol, that certain artificial dyes are derived.
    • any one of a variety of lactones created because of the result of phenols with phthalic anhydride
    • Among a few synthetic organic dyes made as condensation products of the phenols with phthalic acid, and well-represented by phenol phthale├»n. Their particular alkaline solutions tend to be fluorescent.
    • one of several number of coloring-matters formed by the condensation of phthalic anhydrid with phenols. Some of the phthaleins have actually a purgative action when taken internally. They have been of particular significance into the color-chemistry, and particular of the types are valuable dyestuffs. See phenolphthalein and phthalic anhydrid.

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