regioselectiveadj.

Brit.

/ˌriːdʒɪə(ʊ)sᵻˈlɛktɪv/, U.S.

/ˌridʒioʊsəˈlɛktɪv/

Origin: A borrowing from Latin, combined with an English element. Etymons: Latin regiō , selective adj.

Etymology: < classical Latin regiō direction, region (see region n.) + selective adj. Compare regiospecific adj.

Chemistry.

Of a reaction taking place at a particular site on a molecule: leading to preferential formation of one of two or more possible isomeric products; characterized by or characteristic of such a reaction. Cf. regiospecific adj., stereoselective adj.

ΚΠ

1968 A. Hassner in Jrnl. Org. Chem. 33 2684/2 If a reaction proceeds without skeletal rearrangement to give exclusively (within experimental error) one or two of two or more possible isomers, it is called regiospecific. It there is a significant preponderance of one isomer formed it is said to be regioselective.

1980 P. Jenner & B. Testa Concepts in Drug Metabolism ii. 137 Enzyme B is phenobarbital inducible, has low stereoselectivity, but is regioselective for 6-hydroxylation.

1993 Science 1 Jan. 64/3 The..catalyst described above also achieves regioselective dihydroxylation of the squalene terminal double bond.

2007 Nature 19 Apr. 896/1 The chemical synthesis of carbohydrates is one way to obtain pure oligosaccharides, but it is hampered by difficulties associated with the regioselective protection of polyhydroxyls and challenges related to the stereoselective assembly of glycosidic linkages.

Derivatives

regioselecˈtivity n. the property of being regioselective; the extent to which a reaction or process is regioselective.

ΚΠ

1968 A. Hassner in Jrnl. Org. Chem. 33 2684/2 Unlike stereospecificity where one is faced with the problem of two isomeric substrates leading to the same product, in regiospecificity one deals with only one substrate leading to two (or more) possible regioisomers. This permits the designation regioselectivity to be used for partial regiospecificity.

2000 W. Cabri & R. Di Fabio From Bench to Market vi. 127 The regioselectivity of both couplings was not reported; however, in a similar reaction..a 2/1 ratio in favour of the useful isomer 20 was observed.

This is a new entry (OED Third Edition, March 2010; most recently modified version published online March 2022).

单词	regioselective
释义	regioselectiveadj. Brit. /ˌriːdʒɪə(ʊ)sᵻˈlɛktɪv/, U.S. /ˌridʒioʊsəˈlɛktɪv/ Origin: A borrowing from Latin, combined with an English element. Etymons: Latin regiō , selective adj. Etymology: < classical Latin regiō direction, region (see region n.) + selective adj. Compare regiospecific adj. Chemistry. Of a reaction taking place at a particular site on a molecule: leading to preferential formation of one of two or more possible isomeric products; characterized by or characteristic of such a reaction. Cf. regiospecific adj., stereoselective adj. ΚΠ 1968 A. Hassner in Jrnl. Org. Chem. 33 2684/2 If a reaction proceeds without skeletal rearrangement to give exclusively (within experimental error) one or two of two or more possible isomers, it is called regiospecific. It there is a significant preponderance of one isomer formed it is said to be regioselective. 1980 P. Jenner & B. Testa Concepts in Drug Metabolism ii. 137 Enzyme B is phenobarbital inducible, has low stereoselectivity, but is regioselective for 6-hydroxylation. 1993 Science 1 Jan. 64/3 The..catalyst described above also achieves regioselective dihydroxylation of the squalene terminal double bond. 2007 Nature 19 Apr. 896/1 The chemical synthesis of carbohydrates is one way to obtain pure oligosaccharides, but it is hampered by difficulties associated with the regioselective protection of polyhydroxyls and challenges related to the stereoselective assembly of glycosidic linkages. Derivatives regioselecˈtivity n. the property of being regioselective; the extent to which a reaction or process is regioselective. ΚΠ 1968 A. Hassner in Jrnl. Org. Chem. 33 2684/2 Unlike stereospecificity where one is faced with the problem of two isomeric substrates leading to the same product, in regiospecificity one deals with only one substrate leading to two (or more) possible regioisomers. This permits the designation regioselectivity to be used for partial regiospecificity. 2000 W. Cabri & R. Di Fabio From Bench to Market vi. 127 The regioselectivity of both couplings was not reported; however, in a similar reaction..a 2/1 ratio in favour of the useful isomer 20 was observed. This is a new entry (OED Third Edition, March 2010; most recently modified version published online March 2022). < adj.1968
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