Method for preparing diaryl carbonates employing hexaalkylguanid

Details Method for preparing diaryl carbonates employing hexaalkylguanid Method for preparing diaryl carbonates employing hexaalkylguanid

1997-09-12

1999-04-27

Ambrose, Michael G.

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

Organic compounds

Carbonate esters

558271, 558272, 558273, C07C 6800

Patent

active

058980792

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 typically comprises a group VIIIB metal or compound thereof, an inorganic cocatalyst, an organic cocatalyst and a hexaalkylguanidinium bromide or chloride, preferably bromide. The use of the hexaalkylguanidinium salt causes an increase in the yield of diaryl carbonate without a decrease in selectivity.

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: 5498789 (1996-03-01), Takagi et al.
patent: 5760272 (1998-06-01), Pressman et al.
Chemical Abstracts, vol. 120, No. 1, Jan. 3, 1994 abstract No. 8293.

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