| 单词 | carbonium ion |
| 释义 | > as lemmascarbonium ion Originally: an organic radical or ion bearing a positive or negative charge on a carbon atom. In later use: an organic cation in which the positive charge is located on a carbon atom, a carbocation; more fully carbonium ion. Usually attributive. Cf. carbanion n. ΘΚΠ the world > matter > chemistry > organic chemistry > carbon > [noun] > carbon ions > positive carbonium1902 carbocation1960 the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > hydrocarbon radicals > mono or univalent radicals allyl1845 tetryl1857 carbonium1902 lauryl1915 1902 Jrnl. Chem. Soc. 82 i. 600 Triphenylmethyl... Carbonium Salts. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) xl. 595 Cotarnine itself, in ethereal or chloroform solution, has the carbonium structure III. 1927 Jrnl. Amer. Chem. Soc. 49 1289 Pyrogallolbenzein has basic properties, as is shown by the preparation of the hydrochloride, sulfate and perchlorate. These salts..may be represented as oxonium or carbonium salts. 1933 E. S. Wallis & F. H. Adams in Jrnl. Amer. Chem. Soc. 55 3838 For the sake of clearness in discussion all tricovalent carbon compounds may be divided into three classes: (1) ‘carbanions’..(2) free radicals..(3) carbonium ions... The above word [carbanion] is here proposed for a negatively charged carbon ion in contrast to the term ‘carbonium’, which indicates a positively charged ion. 1936 Nature 8 Aug. 224/1 Ionic reactions..generally involve carbonium anions and cations. 1972 R. O. C. Norman & D. J. Waddington Mod. Org. Chem. vi. 82 The order of stability of carbonium ions is tertiary > secondary > primary. 2001 Science 4 May 870/1 Positively charged carbon species (carbonium ions) cease to react with H2 before they are fully saturated. < as lemmas |
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