Process for preparing cyclohexanones by hydrogenation of the cor

Details Process for preparing cyclohexanones by hydrogenation of the cor Process for preparing cyclohexanones by hydrogenation of the cor

1998-06-29

2000-04-04

Padmanabhan, Sreeni

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

Organic compounds

Oxygen containing

568309, 568376, C07C 4500

Patent

active

060463651

ABSTRACT:
Unsubstituted or substituted cyclohexanones are advantageously prepared by hydrogenation of the corresponding phenols in the presence of a palladium-on-carbon catalyst at from 100 to 250.degree. C. and from 1 to 20 bar of hydrogen pressure if the catalyst is mixed with a base component and from 20 to 200% by weight of water (based on the base component) and this mixture is used in the hydrogenation. For identical batches, this gives virtually identical hydrogenation times and virtually equally good yields of cyclohexanones.

REFERENCES:
patent: 2829166 (1958-04-01), Joris et al.
patent: 3076810 (1963-02-01), Duggan et al.
patent: 3998884 (1976-12-01), Gibson
patent: 4200553 (1980-04-01), Van Peppen et al.
patent: 4304943 (1981-12-01), Bjornson
Nishimura et al, Bull. Chem.Soc.Jpn., 65, 2955-2959, 1992.
"Substitute cyclohexanone produce substitute phenol hydrogenolysis water palladium catalyst intermediate pharmaceutical cardiovascular agent" abstract of JP 57004932, 1982.

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