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https://hdl.handle.net/2440/17814
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dc.contributor.author | Barr, L. | - |
dc.contributor.author | Lincoln, S. | - |
dc.contributor.author | Easton, C. | - |
dc.date.issued | 2005 | - |
dc.identifier.citation | Supramolecular Chemistry, 2005; 17(7):547-555 | - |
dc.identifier.issn | 1061-0278 | - |
dc.identifier.issn | 1029-0478 | - |
dc.identifier.uri | http://hdl.handle.net/2440/17814 | - |
dc.description.abstract | 6A-Deoxy-6A-propynamido-β-cyclodextrin reacts with 4-tert-butylphenyl azide in aqueous solution, to form the 5-(aminocarbonyl)-substituted triazole in preference to the 4-(aminocarbonyl)- substituted analogue, in a ratio of 25:1. The cyclodextrin moiety templates the reaction through the formation of a host-guest complex of the dipole with the dipolarophile, controlling the regio-selectivity of cycloaddition. In a control reaction under similar conditions, with propiolamide instead of the cyclodextrin derivative, 5- and 4-(aminocarbonyl)-1-(4-tert-butylphenyl)-1,2,3-triazole were formed in a ratio of 1:4. As well as reversing the regioselectivity, the cyclodextrin substituent increases the rate of cycloaddition, by at least two orders of magnitude for the reaction to give the 5-substituted cycloadduct. Even the rate of formation of the 4-substituted cycloadduct is increased by a factor of two. Less marked effects are observed with phenyl azide and 4-tert-butylbenzyl azide as dipoles. © 2005 Taylor & Francis. | - |
dc.description.statementofresponsibility | Lorna Barr, Stephen F. Lincoln And Christopher J. Easton | - |
dc.language.iso | en | - |
dc.publisher | Gordon Breach Sci Publ Ltd | - |
dc.source.uri | http://dx.doi.org/10.1080/10610270500329131 | - |
dc.subject | Molecular reactors | - |
dc.subject | Triazoles | - |
dc.subject | Cyclodextrins | - |
dc.subject | Regio selectivity | - |
dc.subject | Cycloadditions | - |
dc.subject | Templates | - |
dc.title | A cyclodextrin molecular reactor for the regioselective synthesis of 1,5-disubstituted-1,2,3-triazoles | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1080/10610270500329131 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Aurora harvest 2 Chemistry publications Environment Institute publications |
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