Method for preparing diaryl carbonates employing .beta.-diketone

Details Method for preparing diaryl carbonates employing .beta.-diketone Method for preparing diaryl carbonates employing .beta.-diketone

1997-03-24

1999-06-01

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

558271, 558272, 558273, C07C 6800

Patent

active

059089520

ABSTRACT:
Hydroxyaromatic compounds such as phenol are converted to diaryl carbonates by reaction with oxygen and carbon monoxide in the presence of a catalyst package which comprises a Group VIIIB metal, preferably palladium, salt of at least one aliphatic .beta.-diketone such as 2,4-pentanedione. The catalyst package also preferably comprises an inorganic cocatalyst, an organic cocatalyst and a bromide or chloride, preferably bromide, source such as a hexaalkylguanidinium bromide. The use of the .beta.-diketone salt confers such advantages as long shelf life under normal storage conditions, high activity upon recycle and capability of carbonylation at relatively low temperatures.

REFERENCES:
patent: 4187242 (1980-02-01), Chalk
patent: 5231210 (1993-07-01), Joyce et al.
patent: 5284964 (1994-02-01), Pressman et al.
patent: 5399734 (1995-03-01), King, Jr. et al.
patent: 5502232 (1996-03-01), Buysch et al.

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