phenolphthalinn.
/ˌfiːnɒlˈ(f)θeɪlɪn/, /ˌfiːnɒlˈ(f)θalɪn/, U.S. /ˌfinəlˈθeɪlən/, /ˌfinəlˈθeɪˌlin/ Chemistry.
A crystalline solid, (C6H4OH)2CHC6H5COOH, which gives phenolphthalein when oxidized, and is used as an indicator.
ΚΠ
1877 Jrnl. Chem. Soc. 31 308 Phenol-phthalin, C20H18O4, is formed by the action of zinc dust on phthalein dissolved in alcohol.
1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xxx. 520 Phenol-phthaleïn..is reduced by potash and zinc dust to phenol-phthaline.
1955 New Phytologist 54 2 The phenolphthaline required was prepared by the method of Baeyer.
1958 Science 17 Oct. 872/1 For practical measurement of the typical oxidizing effect of Los Angeles smog,..oxidation of phenolphthalin to phenolphthalein, and many other oxidation-reduction reactions can be used.
1989 R. Dryer & G. Lata Exper. Biochem. ii. i. 341 Many dyes are noncovalently bound to proteins. Methyl orange, phenolphthalin..are examples.
This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1877