Thermal reaction of azoisopropane in the presence of (E)-CH<sub>3</sub>CH CHCH<sub>3</sub>: reactions of the radical 2-Ċ<sub>3</sub>H<sub>7</sub>
作者:László Seres、Ronald Fischer、Klaus Scherzer、Miklós Görgényi
DOI:10.1039/ft9959101303
日期:——
The azoisopropane-initiated thermal reaction of (E)-CH3CHCHCH3 has been studied in the temperature range 489.5â542.0 K.For the reactions (CH3)2CHNNCH(CH3)2â 2 2-Ä3H7+ N2(1), 2-Ä3H7+(E)-CH3CHCHCH3â C3H8+(E)-Ä4H7(4), â(CH3)2CHCH(CH3)ÄH(CH3)(5), 2 2-Ä3H7â(CH3)2 CHCH(CH3)2(2) the following Arrhenius parameters were determined: log(k1/sâ 1)=(16.42 ± 0.30)â(201.9 ± 3.0) kJ molâ 1/θ, log[(k4/k1/22)/dm3/2 molâ 1/2 sâ 1/2]=(3.64 ± 0.40)â(46.9 ± 2.1) kJ molâ 1/θ, log[(k5/k1/22)/dm3/2 molâ 1/2 sâ 1/2](2.53 ± 0.60)â(39.5 ± 2.4) kJ molâ1/θ where θ=RT In 10.For the cross-combination ratios of the radicals 2-Ä3H7 and (Z)-Ä4H7, Ï[2-Ä3H7, (Z)-Ä4H7]t= 2.12 ± 0.10 was obtained, where the subscript t refers to the terminal combination.Formation of certain characteristic products was observed in various addition/isomerization/dissociation processes. 2-Ä3H7 addition to (E)-CH3CHCHCH3 is suggested as the rate-determining step, followed by 1, 4- and 1,5-H-atom shifts.
在 489.5–542.0 K 温度范围内研究了 (E)-CH3CHCHCH3 偶氮异丙烷引发的热反应。对于反应 (CH3)2CHNNCH(CH3)2−2 2-ä3H7+ N2(1), 2-3H7+(E)-CH3CHCHCH3—C3H8+(E)-4H7(4), —(CH3)2CHCH(CH3)—H(CH3)(5), 2 2-3H7â (CH3)2 CHCH(CH3)2(2) 确定下列阿累尼乌斯参数: log(k1/s−1)=(16.42 ± 0.30)−(201.9 ± 3.0) kJ mol− 1/θ, log[(k4/k1/22)/dm3/2 mol — 1/2 s — 1/2]=(3.64 ± 0.40) — (46.9 ± 2.1) kJ mol — 1/θ, log[(k5/k1/22)/dm3/2 mol — 1/2 s — 1/2](2.53 ± 0.60) — (39.5 ± 2.4) kJ mol — 1/θ 其中 θ=RT In 10. 对于部首 2-ä3H7 和 (Z)-ä4H7 的交叉组合比, Ï[2-ä3H7, (Z)-ä得出4H7]t= 2.12 ± 0.10,其中下标t表示末端组合。在各种加成/异构化/解离过程中观察到某些特征产物的形成。建议将 2-ä3H7 添加到 (E)-CH3CHCHCH3 作为速率决定步骤,然后进行 1、4- 和 1,5-H 原子位移。