| 单词 | regiospecific |
| 释义 | regiospecific, a. Chem.|ˌriːdʒɪəʊspəˈsɪfɪk|
[f. L. regio region n. + specific a.]
Regionally specific; spec. designating or characterized by reactions and processes which take place preferentially at some locations (esp. sites on a single molecule) rather than at others owing to local factors (such as the geometry of the molecule).
1968Hassner & Boerwinkle in Jrnl. Amer. Chem. Soc. XC. 217/1 In nitromethane–methylene chloride ionic addition of BrN3 to styrene proceeds in a regiospecific manner. 1972Buchanan & Sable in B. S. Thyagarajan Selective Org. Transformations II. 10 Ion-pair intermediates involving a benzylic cation have also been proposed to account for regiospecific and predominantly cis addition of deuterium bromide to cis- and trans-1-phenylpropene. 1977Jrnl. Organometallic Chem. CXLI. c30 The organic skeleton in this complex thus derives from the formal reductive coupling of two pyrylium moieties in a regiospecific, yet unsymmetrical fashion. 1988Nature 10 Mar. 121/1 The preorganization of extracellular macromolecular substrates for regiospecific nucleation and the subsequent development of biominerals with controlled micro-architecture can be clearly demonstrated in many systems.
Hence ˌregiospeciˈficity n., the state of being regiospecific; the extent to which a particular reaction is regiospecific.
1968A. Hassner in Jrnl. Organic Chem. XXXIII. 2684/2 We have proposed that the course of such reactions be referred to as regiospecific, the term being derived from the latin ward [sic] regio denoting direction. Regiospecificity then refers to the directional preference of bond formation. 1977Jrnl. Organometallic Chem. CXLI. c31 Clearly the regiospecificity encountered here is determined by the coordinating presence of an iron carbonyl fragment. 1978Further Perspectives Organic Chem. (CIBA Symp.) 73 The regiospecificity of the formylation (90{pcnt}) at the 6–position. |
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