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Miyazaki, T.; Kinugawa, K.; Eguchi, M.; Guedes, S.M.L.
Instituto de Energia Atomica, Sao Paulo (Brazil). Divisao de Radioquimica1977
Instituto de Energia Atomica, Sao Paulo (Brazil). Divisao de Radioquimica1977
AbstractAbstract
[en] Selective hydrogen atom abstraction reaction by H atoms, has been found in Isobutane, 2,2,3,3-tetramethylbutane(TMB), cyclopropane matrices besides neopentane matrix. The selective hydrogen atom abstraction reaction in neopentane-isobutane mixture is affected by the difference of kinetic energies of H atoms. The reaction occurs more favorably with decreasing the kinetic energy of H atoms. Competitive reaction between c-C6H12 and Hi for H atoms has been studied in the radiolysis and photolysis of neo-C5H12HI mixture at 77 K. The rate constants of these reactions in neopentane matrix are quite different from these of thermal H atom reaction, but similar to those of hot H atom reaction. Importance of the selective hydrogen atom abstraction reaction by H atoms is pointed out in the radical formation in the radiolysis of pure TMB at 77 K
[pt]
A reacao seletiva de abstracao do atomo de hidrogenio por atomos de H, tem sido observado em matrizes como isobutano, 2,2,3,3 tetrametilbutano (TMB), ciclopropano alem da matriz de neopentano. A reacao seletiva de abstracao do atomo de H no sistema neopentano (matriz)/ isobutano (soluto) e afetada pela diferenca de energia cinetica dos atomos de H. A reacao ocorre favoravelmente com decrescimo de energia cinetica dos atomos de H. A reacao competitiva entre c-C6H12 e HI por atomos de H tem sido estudada da radiolise e fotolise dos sistemas neoC5H12/c-C6H12/HI a 770K. As constantes de velocidade destas reacoes em matrizes de neopentano sao muito diferentes daquelas onde participa o atomo de H 'thermal', mas sao similares as reacoes com atomos de H 'hot'. A importancia da reacao seletiva de abstracao do atomo de H por atomos de H e assinalada na formacao do radical na radiolise de TMB puro a 770KSource
Publicacao IEA; no. 462; Jan 1977; 28 p
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