ethylidenen.

Brit.

/ᵻˈθɪlᵻdiːn/,

/ᵻˈθʌɪlᵻdiːn/, U.S.

/ɛˈθɪləˌdin/,

/ˈɛθələˌdin/

Forms: 1800s aethylidene, 1800s aethylydene, 1800s ethyliden, 1800s– aethyliden, 1800s– ethylidene.

Origin: Of multiple origins. Partly a borrowing from German. Partly a borrowing from French. Etymons: German Äthyliden; French éthylydène.

Etymology: < (i) German Äthyliden (1858 in Bromäthyliden (in the passage translated in quot. 1859¹), or earlier; now usually Ethyliden ) and its probable etymon (ii) French éthylydène (A. Lieben 1858, in Comptes rendus hebdomadaires de l'Académie des Sciences 46 663) < éthylène ethylene n., with insertion of -yd- (in aldéhyde aldehyde n.). Compare -idene suffix.

Chemistry.

The divalent hydrocarbon radical ^_CHCH₃. Usually attributive or a formative element in chemical names.

ΘΚΠ

the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > hydrocarbon radicals > bivalent radicals

ethylene1853

ethylidene1859

propylidene1876

pentamethylene1887

vinylidene1898

isopropylidene1900

1859 H. Watts tr. L. Gmelin Hand-bk. Chem. XIII. 451 Bromide of ethylidene [Ger. Bromäthyliden]. C⁴H⁴Br².

1859 H. Watts tr. L. Gmelin Hand-bk. Chem. XIII. 453 The term ethylidene is applied to a radical (C²H⁴), supposed to exist in a series of compounds derived from aldehyde, and isomeric with the ethylene-compounds.

1871 Amer. Jrnl. Pharmacy 43 221 Chloride of Ethyliden is coming into use in Germany as an anæsthetic.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) ix. 215 The preparation of common lactic acid from aldehyde, CH₃·CHO,..shows that it contains the group CH₃·CH:, ‘ethylidene’; it is therefore termed ‘ethylidene lactic acid’.

1952 Morton & Hoggarth in E. H. Rodd Chem. Carbon Compounds I b. xiv. 903 Ethylidenediurethane, CH₃CH(NH·CO₂Et)₂, m.p. 126°, from urethane and acetaldehyde.

2002 Proc. National Acad. Sci. U.S.A. 99 11628/1 In plant and most cyanobacterial phytochromes, the chromophore is bound via its ring A ethylidene side chain to a particular Cys residue.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).

单词	ethylidene
释义	ethylidenen. Brit. /ᵻˈθɪlᵻdiːn/, /ᵻˈθʌɪlᵻdiːn/, U.S. /ɛˈθɪləˌdin/, /ˈɛθələˌdin/ Forms: 1800s aethylidene, 1800s aethylydene, 1800s ethyliden, 1800s– aethyliden, 1800s– ethylidene. Origin: Of multiple origins. Partly a borrowing from German. Partly a borrowing from French. Etymons: German Äthyliden; French éthylydène. Etymology: < (i) German Äthyliden (1858 in Bromäthyliden (in the passage translated in quot. 1859¹), or earlier; now usually Ethyliden ) and its probable etymon (ii) French éthylydène (A. Lieben 1858, in Comptes rendus hebdomadaires de l'Académie des Sciences 46 663) < éthylène ethylene n., with insertion of -yd- (in aldéhyde aldehyde n.). Compare -idene suffix. Chemistry. The divalent hydrocarbon radical ^_CHCH₃. Usually attributive or a formative element in chemical names. ΘΚΠ the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > hydrocarbon radicals > bivalent radicals ethylene1853 ethylidene1859 propylidene1876 pentamethylene1887 vinylidene1898 isopropylidene1900 1859 H. Watts tr. L. Gmelin Hand-bk. Chem. XIII. 451 Bromide of ethylidene [Ger. Bromäthyliden]. C⁴H⁴Br². 1859 H. Watts tr. L. Gmelin Hand-bk. Chem. XIII. 453 The term ethylidene is applied to a radical (C²H⁴), supposed to exist in a series of compounds derived from aldehyde, and isomeric with the ethylene-compounds. 1871 Amer. Jrnl. Pharmacy 43 221 Chloride of Ethyliden is coming into use in Germany as an anæsthetic. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) ix. 215 The preparation of common lactic acid from aldehyde, CH₃·CHO,..shows that it contains the group CH₃·CH:, ‘ethylidene’; it is therefore termed ‘ethylidene lactic acid’. 1952 Morton & Hoggarth in E. H. Rodd Chem. Carbon Compounds I b. xiv. 903 Ethylidenediurethane, CH₃CH(NH·CO₂Et)₂, m.p. 126°, from urethane and acetaldehyde. 2002 Proc. National Acad. Sci. U.S.A. 99 11628/1 In plant and most cyanobacterial phytochromes, the chromophore is bound via its ring A ethylidene side chain to a particular Cys residue. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022). < n.1859
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