| 单词 | double bond |
| 释义 | > as lemmasdouble bond double bond n. [bond n.1 13e] Chemistry a chemical bond in which the two atoms ‘share’ two pairs of electrons rather than one pair. ΚΠ 1889 G. M'Gowan tr. A. Bernthsen Text-bk. Org. Chem. i. 49 The assumption that the affinity which becomes free at each of two carbon atoms, upon abstraction of the hydrogen, is employed in creating a ‘double bond’ between them. 1889 G. M'Gowan tr. A. Bernthsen Text-bk. Org. Chem. i. 50 By this term ‘double bond’ is not, however, to be understood a closer or more intimate combination. The olefines, on the contrary, are more readily oxidized than the paraffins, being thereby attacked at the point of the double bond. 1903 A. J. Walker & O. E. Mott tr. A. F. Holleman Text-bk. Org. Chem. I. §129. 150 The double bond must not be regarded as a mere doubling of the single one. 1944 Hackh's Chem. Dict. (ed. 3) 286/2 Double bond, a condition which exists in unsaturated compounds where two single valence bonds connect two atoms. 1964 N. G. Clark Mod. Org. Chem. ii. 14 The pair of valency bonds linking adjacent carbon atoms together..is referred to as an ethylenic or olefinic bond. When this type of linkage occurs between other atoms, it is simply termed a double bond. < as lemmas |
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