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Gas-Phase Elimination Reaction of Ethyl (5-cyanomethyl-1,3,4-thiadiazol-2-yl)carbamate: A Computational Study
dc.creator | Vélez E. | spa |
dc.creator | Ruíz P. Quijano J. | spa |
dc.creator | Notario R. | spa |
dc.date.accessioned | 2016-06-23T14:01:38Z | |
dc.date.available | 2016-06-23T14:01:38Z | |
dc.date.created | 2015 | |
dc.identifier.issn | 5388066 | |
dc.identifier.uri | http://hdl.handle.net/11407/2285 | |
dc.description.abstract | The gas‐phase elimination reaction of ethyl (5‐cyanomethyl‐1,3,4‐thiadiazol‐2‐yl)carbamate has been studied computationally at the MP2/6–31++G(2d,p) level of theory. The values of the activation parameters and rate constants for the thermal decomposition were evaluated over a temperature range from 405.0 to 458.0 K. The temperature dependence of the rate constants was used to deduce the modified Arrhenius expression: log k405–458 K = (9.01 ± 0.49) + (1.32 ± 0.16) log T – (6946 ± 30) 1/T, which is in good agreement with the expression obtained from experimental data. The results confirm that the mechanism is a cis‐concerted elimination that occurs in two steps: The first one corresponds to the formation of ethylene and an intermediate, 5‐(cyanomethyl)‐1,3,4‐thiadiazol‐2‐yl‐carbamic acid, via a six‐membered cyclic transition state, and the second one is the decarboxylation of this intermediate via a four‐membered cyclic transition step, leading to carbon dioxide and the corresponding 1,3,4‐thiadiazole derivative (5‐amino‐1,3,4‐thiadiazole‐2‐acetonitrile). The connectivity of transition states with their respective minima was verified through intrinsic reaction coordinate calculations, and the progress of the reaction was followed by means of Wiberg bond indices, resulting that both transition states have an “early” character, nearer to the reactants than to the products. | eng |
dc.language.iso | eng | |
dc.publisher | John Wiley and Sons Inc. | spa |
dc.relation.isversionof | http://onlinelibrary.wiley.com/doi/10.1002/kin.20967/full | spa |
dc.source | Scopus | spa |
dc.title | Gas-Phase Elimination Reaction of Ethyl (5-cyanomethyl-1,3,4-thiadiazol-2-yl)carbamate: A Computational Study | spa |
dc.type | Article in Press | eng |
dc.rights.accessrights | info:eu-repo/semantics/restrictedAccess | |
dc.rights.accessrights | info:eu-repo/semantics/restrictedAccess | |
dc.contributor.affiliation | Departamento de Ciencias Básicas Universidad de Medellín Medellín Colombia | spa |
dc.contributor.affiliation | Laboratorio de Fisicoquímica Orgánica Facultad de Ciencias Universidad Nacional de Colombia Sede Medellín 3840 Medellín Colombia | spa |
dc.contributor.affiliation | Instituto de Química Física Rocasolano C.S.I.C Serrano 119 28006 Madrid Spain | spa |
dc.identifier.doi | 10.1002/kin.20967 | |
dc.subject.keyword | Carbon | eng |
dc.subject.keyword | Carbon dioxide | eng |
dc.subject.keyword | Carboxylation | eng |
dc.subject.keyword | Chemical reactions | eng |
dc.subject.keyword | Computation theory | eng |
dc.subject.keyword | Ethylene | eng |
dc.subject.keyword | Gases | eng |
dc.subject.keyword | Radioactivity logging | eng |
dc.subject.keyword | Rate constants | eng |
dc.subject.keyword | Reaction kinetics | eng |
dc.subject.keyword | Temperature distribution | eng |
dc.subject.keyword | 1 ,3 ,4-thiadiazole | eng |
dc.subject.keyword | Activation parameter | eng |
dc.subject.keyword | Arrhenius expressions | eng |
dc.subject.keyword | Computational studies | eng |
dc.subject.keyword | Cyclic transitions | eng |
dc.subject.keyword | Gas-phase elimination | eng |
dc.subject.keyword | Intrinsic reaction coordinate calculations | eng |
dc.subject.keyword | Temperature dependence | eng |
dc.subject.keyword | Thermal logging | eng |
dc.relation.ispartofen | International Journal of Chemical Kinetics Volume 48, Issue 1 January 2016, Pages 23–31 | eng |
dc.type.driver | info:eu-repo/semantics/article |
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