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:
影响因子:
--
通讯作者:
Frank Hunold
中科院分区:
文献类型:
--
作者:
W. Roth;Frank Hunold
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.