Process for preparing diaryl carbonates

Details Process for preparing diaryl carbonates Process for preparing diaryl carbonates

1994-11-15

1996-03-26

Dees, Jose G.

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

Organic compounds

Carbonate esters

558271, 558274, 558275, C07C 6996

Patent

active

055022324

ABSTRACT:
Diaryl carbonates can be prepared by reacting aromatic hydroxy compounds with CO and O.sub.2 at elevated temperature over a noble metal catalyst in the presence of a base, a quaternary salt, a cocatalyst and a dessicant. According to the invention, the noble metal catalyst is activated with CO in the presence of the quaternary salt and optionally in the presence of the cocatalyst. In a particular process variant, the base used is a preformed alkali metal phenoxide.

REFERENCES:
patent: 4201721 (1980-05-01), Hallgren
patent: 5336803 (1994-08-01), Kezuka et al.
Chemical Abstracts-10th Coll, 1 page; DE 2,815,512; GB 1,578,713; CA#92:163723b, 1979.
Journal of Organometallic Chemistry, vol. 212, 1981, pp. 135-139; "The palladium-catalyzed synthesis of diphenyl . . . ", J. E. Hallgren et al.

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