| 单词 |
allene |
| 释义 |
allene
synonym of allylene.
[ad. Fr. allène (coined by L. Henry 1875, in Bull. Soc. Chim. Paris XXIII. 350): see allyl n., -ene.]
1. = *propadiene n.
1877H. Watts Fownes' Man. Elem. Chem. (ed. 12) II. 63, β Allylene, or allene, CH2{b2}CH{b2}CH2 [sic], is formed..by the electrolysis of itaconic acid. 1930Jrnl. Amer. Chem. Soc. LII. 4540 No record exists concerning the behavior of methylacetylene, CH3—C{b3}CH , at high temperatures. Except for Lebedev's work, the same may be said for allene, CH2{b2}C{b2}CH2 . 1968A. A. Baker Unsaturation in Org. Chem. vii. 89 In 1891 Vaubel prepared allene..and he found that it readily isomerized on heating to propyne. 1979Nomencl. Org. Chem.: A–F, H (I.U.P.A.C.) 11 The following non-systematic names are retained: Ethylene CH2{b2}CH2 . Allene CH2{b2}C{b2}CH2 . 1988New Scientist 22 Oct. 57/2, I can think of allene in the traditional way as a molecule of formula CH2{b2}C{b2}CH2 with double bonds between its three carbon atoms.
2. A substituted derivative of allene; a hydrocarbon having two double bonds in adjacent positions.
1899Jrnl. Chem. Soc. LXXVI. i. 658 The various allene hydrocarbons can be distinguished..(i) Mono-substituted allenes give dibromotrimethylenes. 1937Thorpe's Dict. Appl. Chem. (ed. 4) I. 79/2 The allenes are non-conjugated diolefinic hydrocarbons..which are obtained by..isomerization of certain alkylacetylenes on heating. 1972A. Dempster tr. Natta & Farina's Stereochem. iv. 113 A class very similar to the allenes consists of the spirans—bicyclic compounds whose rings are attached to only one atom. |
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