| 释义 |
ketene Chem.|ˈkiːtiːn|
Also -en.
[ad. G. keten (H. Staudinger 1905, in Ber. d. Deut. Chem. Ges. XXXVIII. 1735): see ketone and -ene.]
a. Any compound containing an ethylenic double bond adjacent to a carbonyl group, i.e. the structure {btl1}{bbl1}C{b2}C{b2}O.
[1905Jrnl. Chem. Soc. LXXXVIII. 444 Diphenylketen CPh2:CO, the first representative of a new type of compound, is prepared by the action of zinc on an ethereal solution of diphenylchloroacetyl chloride.] 1907Ibid. XCI. 1941 There can..be no doubt that the new substance is a keten, having the formula CH2:CO. 1942Fuson & Snyder Org. Chem. xxi. 296 Carbonyl compounds which contain the grouping {btl1}{bbl1}C{b2}C{b2}O are known as ketenes... Ketenes fall into two classes, aldoketenes and ketoketenes. 1971Jrnl. Chem. Soc. (C) 3645 The addition of ketenes to conjugated dienes generally yields 1,2-adducts.
b. The simplest of the ketenes, CH2:C:O, a pungent colourless gas which dimerizes on liquefaction and has wide applications in synthesis owing to its high reactivity.
1907Jrnl. Chem. Soc. XCI. 1941 Keten has a peculiar penetrating smell. 1946[see acetylation]. 1964N. G. Clark Mod. Org. Chem. xi. 211 On heating acetic acid vapour at 700° to 800° under reduced pressure, it loses the elements of water to form keten. 1972Guardian 16 Oct. 15/2 Although keten and its organic relations have been known and used for generations, no one had realised that they could produce salts. |