van-der-Waals-Komplexe, Intermediate monomolekularer Reaktionen

van-der-Waals-Komplexe, Intermediate monomolekularer Reaktionen
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van-der-Waals-Komplexe, 中间单分子反应

DOI:
10.1002/jlac.199619961128
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发表时间:
1996
期刊:
Liebigs Annalen
影响因子:
--
通讯作者:
Frank Hunold
Frank Hunold
中科院分区:
--
文献类型:
--
作者:
W. Roth;Frank Hunold

文献摘要

被引文献

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货车德瓦耳斯配合物,单分子反应的中间体 外消旋和内消旋-1,1 ′,2,2 ′,3,3 ′ -六甲基-1,1 ′-联茚基和(1 E,5E)-1,3,4,6-四苯基-1,5-己二烯在超临界CO2中的氧存在下的热分解允许鉴定三种类型的中间体,自由基(2和5)和由自由基对组成的平衡络合物I和II。从氧依赖性的捕获和重排率,它表明,配合物I是主要的热分解产物,这与配合物II不与氧反应。这些速率的温度依赖性允许计算焓以及复杂的II,这与我们的反应力场的预测一致。
van der Waals Complexes, Intermediates in Unimolecular Reactions Thermolysis of rac- and meso-1,1′,2,2′,3,3′ -hexamethyl-1,1′-biindenyl and (1E, 5E)-1,3,4,6-tetraphenyl-1,5-hexadiene in supercritical CO2 in the presence of oxygen allows to identify three types of intermediates, the free radicals (2 and 5) and the equilibrating complexes I and II consisting of radical pairs. From the oxygen dependence of the trapping and rearrangement rates it is shown, that the complex I is the primary thermolysis product, which in contrast to the complex II does not react with oxygen. The temperature dependance of these rates allows to calculate the enthalpy well of the complex II, which agrees well with predictions of our reaction force field.