“sigmatropic”的英文意思_释义_用法

单词

sigmatropic

释义

sigmatropic, a. Chem.|sɪgməˈtrɒpɪk|
[f. sigma + -tropic.]
Involving the movement of a sigma bond to a new pair of atoms within a molecule.
1965Woodward & Hoffmann in Jrnl. Amer. Chem. Soc. LXXXVII. 2511/2 We define as a sigmatropic change of order [i, j] the migration of a σ-bond, flanked by one or more π-electron systems, to a new position whose termini are i{b1}1 and j{b1}1 atoms removed from the original bonded loci, in an uncatalyzed intramolecular process.1974Gill & Willis Pericyclic Reactions iii. 84 The transition state of a sigmatropic change is..reminiscent of the transition state of a cyclo-addition reaction.

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