cyclopentadienen.

Brit.

/ˌsʌɪkləʊpɛntəˈdʌɪiːn/, U.S.

/ˈsaɪkloʊˌpɛn(t)əˈdaɪˌin/

Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: cyclo- comb. form, penta- comb. form, di- prefix¹, -ene comb. form.

Etymology: < cyclo- comb. form + penta- comb. form + di- prefix¹ + -ene comb. form, after German Cyclopentadiën (G. Kraemer & A. Spilker 1896, in Berichte der Deutsch. chem. Ges. 29 554).

Chemistry.

A liquid unsaturated cyclic hydrocarbon, C₅H₆, that is formed as a by-product of the cracking of petroleum, readily reacts to produce a solid dimer, and is used in the manufacture of synthetic resins and in organic syntheses. Also: a substituted derivative of this compound. Cf. cyclopentadienyl n. Unlike the cyclopentadienyl anion, the cyclopentadiene molecule is non-planar and not aromatic.

ΚΠ

1896 Jrnl. Chem. Soc. 70 i. 289 The authors refer to it as the cyclopentadiene of coal tar.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xxxiii. 541 Although the five-membered heterocyclic unsaturated compounds resemble benzene, the unsaturated carbocyclic compound cyclopentadiene does not.

1959 E. P. Stevenson in H. Jarrett Sci. & Resources iv. 126 A new fuel additive, not yet ready for commercial use, is based on manganese and cyclopentadiene.

1992 Chemosphere 24 525 The organic compounds identified from the thermal decomposition of 1,2-dichlorobenzene were unsaturated chlorinated aliphatic hydrocarbons, chlorinated cyclopentadienes, [etc.].

This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	cyclopentadiene
释义	cyclopentadienen. Brit. /ˌsʌɪkləʊpɛntəˈdʌɪiːn/, U.S. /ˈsaɪkloʊˌpɛn(t)əˈdaɪˌin/ Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: cyclo- comb. form, penta- comb. form, di- prefix¹, -ene comb. form. Etymology: < cyclo- comb. form + penta- comb. form + di- prefix¹ + -ene comb. form, after German Cyclopentadiën (G. Kraemer & A. Spilker 1896, in Berichte der Deutsch. chem. Ges. 29 554). Chemistry. A liquid unsaturated cyclic hydrocarbon, C₅H₆, that is formed as a by-product of the cracking of petroleum, readily reacts to produce a solid dimer, and is used in the manufacture of synthetic resins and in organic syntheses. Also: a substituted derivative of this compound. Cf. cyclopentadienyl n. Unlike the cyclopentadienyl anion, the cyclopentadiene molecule is non-planar and not aromatic. ΚΠ 1896 Jrnl. Chem. Soc. 70 i. 289 The authors refer to it as the cyclopentadiene of coal tar. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xxxiii. 541 Although the five-membered heterocyclic unsaturated compounds resemble benzene, the unsaturated carbocyclic compound cyclopentadiene does not. 1959 E. P. Stevenson in H. Jarrett Sci. & Resources iv. 126 A new fuel additive, not yet ready for commercial use, is based on manganese and cyclopentadiene. 1992 Chemosphere 24 525 The organic compounds identified from the thermal decomposition of 1,2-dichlorobenzene were unsaturated chlorinated aliphatic hydrocarbons, chlorinated cyclopentadienes, [etc.]. This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1896
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