Log In To:
The title process, which is to synthesize diaryl carbonates by oxidative carbonylation of phenols with carbon monoxide and oxygen, is characterized in that a catalytic system comprising a metal halide catalyst and one or more cocatalysts of nitrogenous heterocyclic compds. is used to increase the convertibility, selectivity and yield of this catalytic reaction. An above process for preparation of di-Ph carbonate in presence of a 1:1 PdCl2 and 3,6-diaminocarbazole (I) mixture catalyst resulted a convertibility 10.4%, selectivity 100.0%, and yield 10.4%; vs., 5.9, 98.9, and 5.8, resp., without the I.
Titles and abstracts for patent records in CAplus are routinely enhanced to better describe the claimed invention. In this example, CAS enhanced both the abstract and title using additional information found in the patent. The original title of the U.S. publication is Process for producing diaryl carbonates. For the CAplus record, this title was enhanced to read: Process for manufacture of diaryl carbonates having improved convertibility, selectivity, and yield.
View the full-text U.S. patent from USPTO.