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- W207427934 abstract "Thermal decomposition of coal has been postulated to involve the formation of free radicals by processes such as the homolysis of aliphatic or ether-containing bridges which connect polycyclic aromatic units into a macromolecular structure. Understanding the thermal reactivity of coal is important in the study of pyrolysis, liquefaction, and coking. Mechanistic insights into the chemical reactivity of coal at the molecular level can be gained from the study of model compounds which represent structural features in coal. However, radicals generated in a cross-linked macromolecular material such as coal may experience restricted mobility when the radical center remains bound to the residual molecular structure. To model the effects of restricted radical mobility on thermally induced decomposition reactions, thermolyses of model compounds covalently attached to an inert support have been studied. Thermolysis of surface-immobilized 1,2-diphenylethane showed a substantially altered free radical reaction pathway compared with the corresponding liquid phase behavior, while thermolysis of surface-immobilized 1,3-diphenylpropane ({approximately}DPP) showed unexpected regioselectivity resulting from conformational restrictions on hydrogen transfer reactions as the surface coverage of {approximately}DPP decreased. In order to further explore the regionselectivity of hydrogen transfer induced by restricted diffusion, the thermolysis of surface-immobilized 1,4-diphenylbutane ({approximately}DPB) is being examined." @default.
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- W207427934 date "1989-01-01" @default.
- W207427934 modified "2023-09-26" @default.
- W207427934 title "Regioselective thermolysis of 1,4-diphenylbutane enhanced by restricted radical mobility" @default.
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