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- W50573810 abstract "The chemistry of the hydrogen atom is of interest because of its role in hydrocracking reactions during coal liquefaction. By studying the competitive hydrocracking of various substrates under hydrogen pressure at 450/sup 0/C in the presence of 1,3-dimethylnaphthalene as a reference, a number of factors that influence the extent of hydrocracking have been determined. In a series of substituted aromatic compounds, molecules containing phenyl rings hydrocrack less than molecules containing condensed aromatic rings. This is explained by the greater number of resonance structures in the sigma-complex of the condensed ring molecules. The nature of the leaving group influences the extent of hydrocracking. Hydrocracking increased as the leaving group became more stable: R approx. = < phiCH/sub 2/ < phiO < phiS. Finally, steric acceleration appears to be important for highly substituted aromatics. The data is consistent with a mechanism in which hydrogen atom attacks the aromatic ring to form a sigma-complex. This intermediate can then decay via loss of hydrogen atom to reform the starting material or by loss of the ipso substituent to form products." @default.
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- W50573810 date "1986-09-01" @default.
- W50573810 modified "2023-09-26" @default.
- W50573810 title "Selectivity of hydrogen atom reactions" @default.
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