Process for preparing hydroxybiphenyl

Details Process for preparing hydroxybiphenyl Process for preparing hydroxybiphenyl

1995-09-07

1998-06-09

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Alicyclic compound synthesis

Polycyclic product

502201, 502305, 502324, C07C 3706, B01J 2725, B01J 2326, B01J 2324

Patent

active

057637172

ABSTRACT:
A description is given of the preparation of hydroxybiphenyl by dehydrogenation of completely or partially hydrogenated precursors using a supported Rh catalyst which additionally contains chromium, manganese and alkali metal and can contain a sulphur compound. The Rh catalyst which can be used according to the invention is prepared from halide-free starting materials. The Rh catalyst is distinguished by a low dependence of the initial selectivity, with the selectivity in the run-in state and the running-in time on the conditions of the reductive pretreatment and requires only short running-in times to reach the optimum state.

REFERENCES:
patent: 4729977 (1988-03-01), Immel et al.
patent: 5248840 (1993-09-01), Immel et al.

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