prehniticadj.

Brit.

/preɪˈnɪtɪk/, U.S.

/preɪˈnɪdɪk/

Origin: Formed within English, by derivation. Etymons: prehnite n., -ic suffix.

Etymology: < prehnite n. + -ic suffix; so named because the crystals of the acid resemble those of the mineral prehnite.

Chemistry.

prehnitic acid n. a colourless, crystalline aromatic acid produced esp. by the oxidation of natural hydrocarbons.Systematic name: 1,2,3,4-benzenetetracarboxylic acid, C₆H₂(COOH)₄.As a result of early confusion, formerly sometimes applied to the isomeric 1,2,3,5-benzenetetracarboxylic acid (mellophanic acid).

ΚΠ

1871 Jrnl. Chem. Soc. 24 372 The acid formerly described as isopyromellitic acid..is a mixture of two isomeric tetrabasic acids..which the author [sc. A. Baeyer] calls prehnitic and mellophanic acid.

1938 Proc. Royal Soc. A. 165 435 Trimethylbenzoic acid, which was oxidized quantitatively to prehnitic acid in 25 hr., may be regarded as a convenient ‘standard’ for comparative purposes.

1983 Jrnl. Physical Chem. 87 2396/2 Certain of the much less intense lines of the H atom adduct to trimesic and prehnitic acids were also observed.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	prehnitic
释义	prehniticadj. Brit. /preɪˈnɪtɪk/, U.S. /preɪˈnɪdɪk/ Origin: Formed within English, by derivation. Etymons: prehnite n., -ic suffix. Etymology: < prehnite n. + -ic suffix; so named because the crystals of the acid resemble those of the mineral prehnite. Chemistry. prehnitic acid n. a colourless, crystalline aromatic acid produced esp. by the oxidation of natural hydrocarbons.Systematic name: 1,2,3,4-benzenetetracarboxylic acid, C₆H₂(COOH)₄.As a result of early confusion, formerly sometimes applied to the isomeric 1,2,3,5-benzenetetracarboxylic acid (mellophanic acid). ΚΠ 1871 Jrnl. Chem. Soc. 24 372 The acid formerly described as isopyromellitic acid..is a mixture of two isomeric tetrabasic acids..which the author [sc. A. Baeyer] calls prehnitic and mellophanic acid. 1938 Proc. Royal Soc. A. 165 435 Trimethylbenzoic acid, which was oxidized quantitatively to prehnitic acid in 25 hr., may be regarded as a convenient ‘standard’ for comparative purposes. 1983 Jrnl. Physical Chem. 87 2396/2 Certain of the much less intense lines of the H atom adduct to trimesic and prehnitic acids were also observed. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < adj.1871
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