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- W2076709250 abstract "Abstract A study has been conducted of the cleavage of aliphatic linkages between aromatic centers under the influence of zinc halide catalysts. The purpose of this work was to learn more about the chemistry occurring during the liquefaction of coal. 4-Hydroxydiphenylmethane (4-HDPM), 2,4,6-trimethyldiphenylmethane (TMDPM), and 1-benzylnaphthalene (1-BN) were used to simulate structural units present in coal. ZnCl 2 , ZnBr 2 , and ZnI 2 were used as catalysts. It was found that all of the zinc halides are active when converted to a Bronsted acid by interaction with either water or methanol. For a given catalyst, the reactivity of the reactants decreases in the order TMDPM > 4HDPM >1-BN. For a given reactant, the catalyst activity decreases in the order ZnBr 2 > ZnCl 2 > ZnI 2 . Cleavage of the methylene linkage always occurred at the aryl group exhibiting the highest Bronsted basicity. The distribution of reaction products depended on reaction conditions, as well as on reactant and catalyst composition. The reaction kinetics for 4-HDPM, 1-BN, and TMPDPM can be described successfully in terms of a cabocation mechanism. Rate coefficients for each of the elementary steps in the sequence were determined by simulation of the experimental data." @default.
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- W2076709250 date "1984-05-01" @default.
- W2076709250 modified "2023-09-23" @default.
- W2076709250 title "Cleavage of diarylmethanes in the presence of zinc halides" @default.
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- W2076709250 doi "https://doi.org/10.1016/0021-9517(84)90181-7" @default.
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