Process for producing 3,3',4,4'-tetramethyldiphenylmethane

Details Process for producing 3,3',4,4'-tetramethyldiphenylmethane Process for producing 3,3',4,4'-tetramethyldiphenylmethane

1992-02-07

1993-10-19

Pal, Asok

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585481, 585470, 585475, C07C 522

Patent

active

052547680

ABSTRACT:
There is provided a process for producing 3,3',4,4'-tetramethyldiphenylmethane which comprises subjecting tetramethyldiphenylmethane containing at least one of 2,3,3',4'-tetramethyldiphenylmethane and 2,2',3,3'-tetramethyldiphenylmethane to isomerization reaction in the presence of a catalyst to convert into 3,3',4,4'-tetramethyldiphenylmethane. According to the process of the present invention, the objective 3,3',4,4'-tetramethyldiphenylmethane is efficiently obtained from tetramethyldiphenylmethane obtainable in particular by the reaction of o-xylene with formaldehyde. The 3,3',4,4'-tetramethyldiphenylmethane thus obtained can be converted by oxidation into 3,4,3',4'-benzophenonetetracarboxylic acid dianhydride which is important as a raw material for heat-resistant high molecular compounds.

REFERENCES:
patent: 3636177 (1972-01-01), Suzuki et al.
patent: 4173573 (1979-11-01), Shulz et al.
patent: 4962260 (1990-10-01), Sikkenga et al.
Chemical Abstracts, vol. 86, No. 25, May 20, 1977, abstract no. 189435k of JP 76 38710, Yataro Ichikawa et al., "Isomerization of dimethylbiphenyls".

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