Kinetic studies on the reactivity of triphenylmethyl cations adsorbed on silica, alumina, and aluminosilicateZ

Article Abstract:

The apparent rate constant of a polar reaction catalyzed by a moderately strong solid acid is strongly dependent on the nature of the carbenium (R+) precursor R-X, the acid strength of the solid, and the nucleophilicity of the olefinic educt. The catalysis of the surface-mediated reactions by a silica, an alumina, and an aluminosilicate is studied in a slurry of dichloromethane at ambient temperature.

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Probing the surface polarity of various silicas and other moderately strong solid acids by means of different genuine solvatochromic dyes

Article Abstract:

Reichardt's E(sub T)(30) as well as the Kamlet-Taft's solvent parameters alpha and pi can be used as reference system to characterize empirically the surface polarity of moderately strong solid acids. The values of polarity parameters of strong HBD and dipolar surfaces are strongly influenced by the experimental conditions applied.

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Probing surface basicity of solid acids with an aminobenzodifurandione dye as the solvatochromic probe

Article Abstract:

Solvatochromism and sorptiochromism of the dye 3-(4-amino-3-methylphenyl)-7-phenyl-benzol,2b:4,-5b'difuran-2,6-dione are studied. These studies were carried out with an extended set of solvents and various solid acids including silicas, aluminas, and alumosilicates.

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