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.
Carbon monoxide-ethylene copolymerization catalyzed by a Pd(OAc)2/dppp/formic acid system [dppp=1,3-bis(diphenylphosphino)propane]
CAVINATO, GIANNI;
2003
Abstract
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.File in questo prodotto:
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