1,3-butadiene telomerization with methanol catalyzed by heterogenized palladium(II) complexes anchored to polymer-bound bis(diphenylphosphino)methanemoieties

The telomerization of 1,3-butadiene with methanol in the presence of hetero genized palladium(II) catalysts, obtained by anchoring the metal on both a styrene/divinylbenzene macroporous resin and a linear poly(styrene) functio nalized with bis(diphenylphosphino)methane moieties, is reported. In partic ular, the activity and selectivity to telomers of the above catalytic syste ms is compared with the corresponding homogeneous counterpart and with thos e previously obtained with analogous heterogenized systems via polymer-boun d 1,3-bis(diphenylphosphino)propane moieties. The effect of a methoxide pro moter is also studied. Finally, the performances and metal leaching in solu tion of the above heterogenized catalysts are checked after several reactio n cycles in order to verify their real heterogeneous character. (C) 1999 El sevier Science B.V. All rights reserved.