Palladium aryl sulfonate phosphine catalysts for the copolymerization of acrylates with ethene

The reaction of 2-[bis(2-methoxy-phenyl)phosphanyl]-4-methyl-benzenesulfonic acid (a) and 2-[bis(2',6'-dimethoxybiphenyl-2-yl)phosphanyl]benzenesulfonic acid (b) with dimethyl(NN, M,Ar-tetramethylethylenediamine)-palladium(II) (PdMe2(TMEDA)) leads to the formation of TMEDA bridged palladium based polymerization catalysts (1a and 1b). Upon reaction with pyridine, two mononuclear catalysts are formed (2a and 2b). These catalysts are able to homopolymerize ethylene and also copolymerize ethylene with acrylates or with norbornenes. With ligand b, high molecular weight polymers are formed in high yields, but higher comonomer incorporations are obtained with ligand a. [GRAPHICS] sor. [GRAPHICS] a brightness of 344 cd center dot M-2, and a luminous efficiency of 1.86 cd center dot A(-1) for a more practical brightness of 2 703 cd. M-2, were achieved. [GRAPHICS] med. [GRAPHICS] ng variety of supramolecular structures and transformation exhibited by polyampholytes when hydrophobic and other non-charge dependent interactions are operative.