ORGN 648 |
| The palladium catalyzed methoxycarbonylation of ethene is a reaction of great potential from an industrial point of view and has attracted academic interest for many years. Our aim is to investigate the influence of the steric bulk of the diphosphine ligands on the activity and selectivity of the correspondant palladium complex in the copolymerization reaction of CO/ethene. Therefore the synthesis of new bidentate diphosphines containing diphenyl ether backbone and with variable steric bulk on phosphorous atom has been performed. The catalytic experiments show that the product distribution is dramatically different going from the less hindered ligand to the bulkiest one: the former gives only polymers, while the latter gives mainly methyl propanoate and a very small amount of low molecular weight oligomers. A Schulz-Flory distribution was found for the oligomers. |
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Metal-Mediated Reactions and Syntheses
8:00 AM-12:00 PM, Wednesday, 16 March 2005 Convention Center -- Room 10, Oral
Division of Organic Chemistry |