Add time:08/28/2019         Source:sciencedirect.com

Polyketones are obtained by the copolymerization of carbon monoxide and ethylene in the presence of a palladium catalyst formed in situ from Pd(OAc)2, dppp and formic acid in methanol which acted as a solvent. The productivity (g polymer/g Pd* h) is significantly influenced by the concentration of formic acid. Using the ratio Pd/dppp/HCOOH=1/1/3000 at 90 °C and 45 atm, a productivity of 7500 h−1 is obtained. It is suggested that the efficiency of HCOOH as a promoter is due to its capability to act as a source of Pd-hydride species, which initiates the catalytic cycle.

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