Process for the preparation of isobenzofurandiones

Details Process for the preparation of isobenzofurandiones Process for the preparation of isobenzofurandiones

1995-09-13

1997-09-30

Grumbling, Matthew V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549247, C07D30777, C07D30789

Patent

active

056727194

ABSTRACT:
Isobenzofurandiones are obtained in particularly advantageous manner by the dehydrogenation of tetrahydroisobenzofurandiones in the presence of catalysts at elevated temperature by a process in which distilled tetrahydro-isobenzofurandiones are heated to temperatures of between 120.degree. and 300.degree. C. in the presence of supported palladium and/or platinum catalysts and in the presence of maleic acid derivatives in a trickle-phase or liquid-phase procedure, the temperature in the liquid-phase procedure being increased at a rate of 0.6.degree. to 3.degree. C. per minute above 80.degree. to 110.degree. C.

REFERENCES:
JAPIO AN-87-148450, Abstract of JP-62,148,450 Jul. 2, 1987.
WPAT AN-87-224332/32, Abstract of JP-62,148,450 Jul. 2, 1987.
Chemical Abstracts, vol. 105, abstract no. 97266p, p. 615, (1986).
Chemical Abstracts, vol. 106, abstract No. 102704g, p. 1, (1987).
Chemical Abstracts, vol. 109, abstract No. 92690v, p. 679, (1988).
Chemical Abstracts, vol. 108, abstract No. 37393e, (1988).
Chemical Abstracts, vol. 110, abstract No. 213398n, (1989).

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