methylaln.

Brit.

/ˈmɛθᵻlal/,

/ˈmiːθᵻlal/, U.S.

/ˈmɛθəˌlæl/

Origin: Either (i) a borrowing from French. Or (ii) a borrowing from German. Etymons: French méthylal, German Methylal.

Etymology: < French méthylal or German Methylal (although these are attested slightly later: F. Malaguti, 1839 in Comptes rendus de l'Acad. des Sci. 8 199 and Ann. der Pharm. 29 88, respectively), shortened < German Formomethylal (J. Dumas 1838, in Ann. der Pharm. 27 135) < formo- (formo- comb. form) + methyl- (in Methylen methylene n.) + -al (in Acetal acetal n.).

Chemistry.

Dimethoxymethane, (CH₃O)₂CH₂, a colourless, volatile, pungent liquid, used as a solvent and formerly as an anaesthetic. Also called formal.

ΚΠ

1838 Brit. Ann. & Epitome Progress Sci. 1839 364 Malaguti..could only obtain [from formomethylal] half an atom [of formic acid], some pyroxylic acid and a new substance which he terms methylal.

1872 D. Burns Bases of Temperance Reform ii. 45 I can no more accept them as foods than I can chloroform, or ether, or methylal.

1906 M. M. P. Muir & H. F. Morley Watts' Dict. Chem. II. 570 Methylal is a liquid. A dose of 5g. to 8g. produces a hypnotic effect.

1936 H. G. Rule tr. J. Schmidt Text-bk. Org. Chem. (ed. 3) 180 Methylal, methylene dimethyl ether, CH₂(OCH₃)₂, is frequently used in place of formaldehyde for condensations.

1979 Clin. Chem. 25 32/1 Place the rods in a metal frame and transfer them in a tank saturated with development solvent:..tetrahydrofuran/methylal/methanol/NH₄OH.

1994 Catalysis Lett. 23 400 Because of the weak adsorption of formaldehyde, it tends to be liberated into the liquid phase easily, and is then converted to methylal by methanol.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	methylal
释义	methylaln. Brit. /ˈmɛθᵻlal/, /ˈmiːθᵻlal/, U.S. /ˈmɛθəˌlæl/ Origin: Either (i) a borrowing from French. Or (ii) a borrowing from German. Etymons: French méthylal, German Methylal. Etymology: < French méthylal or German Methylal (although these are attested slightly later: F. Malaguti, 1839 in Comptes rendus de l'Acad. des Sci. 8 199 and Ann. der Pharm. 29 88, respectively), shortened < German Formomethylal (J. Dumas 1838, in Ann. der Pharm. 27 135) < formo- (formo- comb. form) + methyl- (in Methylen methylene n.) + -al (in Acetal acetal n.). Chemistry. Dimethoxymethane, (CH₃O)₂CH₂, a colourless, volatile, pungent liquid, used as a solvent and formerly as an anaesthetic. Also called formal. ΚΠ 1838 Brit. Ann. & Epitome Progress Sci. 1839 364 Malaguti..could only obtain [from formomethylal] half an atom [of formic acid], some pyroxylic acid and a new substance which he terms methylal. 1872 D. Burns Bases of Temperance Reform ii. 45 I can no more accept them as foods than I can chloroform, or ether, or methylal. 1906 M. M. P. Muir & H. F. Morley Watts' Dict. Chem. II. 570 Methylal is a liquid. A dose of 5g. to 8g. produces a hypnotic effect. 1936 H. G. Rule tr. J. Schmidt Text-bk. Org. Chem. (ed. 3) 180 Methylal, methylene dimethyl ether, CH₂(OCH₃)₂, is frequently used in place of formaldehyde for condensations. 1979 Clin. Chem. 25 32/1 Place the rods in a metal frame and transfer them in a tank saturated with development solvent:..tetrahydrofuran/methylal/methanol/NH₄OH. 1994 Catalysis Lett. 23 400 Because of the weak adsorption of formaldehyde, it tends to be liberated into the liquid phase easily, and is then converted to methylal by methanol. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1838
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