| abstract |
A condensation reaction catalyst useful for producing an organic compound, for example, anthraquinone compounds from phthalic dianhydride and optionally benzene, comprises a catalytic principal component consisting of a solid acid substance, for example, compound oxides or zeolite, and an additional basic component consisting of ammonia or a volatile organic base, for example, isopropylamine, n-butylamine, or pyridine, and attached to at least strong acid sites of the solid acid substance. |