Method for preparing alpha-(4-isobutylphenyl)propionic acid or i

Details Method for preparing alpha-(4-isobutylphenyl)propionic acid or i Method for preparing alpha-(4-isobutylphenyl)propionic acid or i

1989-12-18

1993-11-09

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

562406, 568428, 568429, 568814, C07C 6976

Patent

active

052604772

ABSTRACT:
A method for preparing .alpha.-(4-isobutylphenyl)propionic acid or its precursor is here disclosed which comprises a step (I) of dehydrogenating p-isobutylethylbenzene in a gaseous phase in the presence of a dehydrogenating metal catalyst to form p-isobutylstyrene and at least one unsaturated hydrocarbon compound selected from a group A defined in Claim 1; a step (II) of reacting p-isobutylstyrene obtained in the step (I) with carbon monoxide and hydrogen or with carbon monoxide and water or a lower alcohol in the presence of a transition metal complex carbonylating catalyst to form .alpha.-(4-isobutylphenyl)propionic acid or its precursor; and a step (III) of hydrogenating at least one unsaturated hydrocarbon compound selected from the group A obtained in the dehydrogenation step (I) to form p-isobutylethylbenzene, and recycling the thus formed p-isobutylethylbenzene through the step (I) as the raw material of the step (I).

REFERENCES:
patent: 3959364 (1976-05-01), Armitage et al.
patent: 3965161 (1976-06-01), Kogure et al.
patent: 4143229 (1979-03-01), Sabbatini
patent: 4329507 (1982-05-01), Takeda et al.
patent: 4350825 (1982-09-01), Huang
patent: 4694100 (1987-09-01), Shimizu et al.
patent: 4937362 (1990-06-01), Tonaka

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