| 释义 |
racemize, v. Chem.|ˈræsəmaɪz|
[f. as prec. + -ize.]
a. trans. To convert (an optically active substance) into a racemic form.
b. intr. To undergo conversion to a racemic form.
1896[implied in racemized ppl. a. below]. 1902Proc. Chem. Soc. XVIII. 198 The author concludes that in alkaline solution the glucoside is racemized by the catalytic action of the hydroxyl ions. 1913Jrnl. Chem. Soc. CIII. 607 The hydrogen d. camphorate..racemises within twenty hours of making up the aqueous solution. 1938G. H. Richter Textbk. Org. Chem. xvii. 335 Many natural products which occur only as one optical antipode may be racemized and resolved into both optical antipodes. 1965G. Hallas Org. Stereochem. ii. 35 Several compounds are known to racemize via non-ionic planar intermediates. 1971Nature 12 Mar. 107/1 In fossil material..the free or bound amino-acids slowly racemize. 1976Lowry & Richardson Mechanism & Theory Org. Chem. v. 218 The excess of rate of loss of optical activity..over rate of product formation..means that some process racemizes the substrate more rapidly than the substrate can form products.
Hence ˈracemized ppl. a., ˈracemizing vbl. n.
1896Proc. Chem. Soc. 23 Apr. 97 Examining..for the presence of racemised salt by converting it into zinc lactate. 1904Jrnl. Chem. Soc. LXXXV. 1253 The racemising effect of the alkali during hydrolysis of the esters. 1940Biochem. Jrnl. XXXIV. 300 Small amounts of partially racemized aspartic acid, as well as of glutamic acid, can be isolated from both normal and malignant tissue protein material. 1951C. R. Noller Textbk. Org. Chem. xvii. 273 The racemizing action of halide ion was known to Kekulé in 1864. 1972S. J. Weininger Contemp. Org. Chem. vii. 158, 2-Octyl bromide in aqueous ethanol forms, among other products, 2-octanol that is partly racemized. |