Pd(II) complexes with bidentate nitrogen-donor chelating ligands: Very versatile and active catalyst precursors for the CO/olefin co- and terpolymerization reactions
B. Milani et G. Mestroni, Pd(II) complexes with bidentate nitrogen-donor chelating ligands: Very versatile and active catalyst precursors for the CO/olefin co- and terpolymerization reactions, COMM INOR C, 20(4-6), 1999, pp. 301-326
The perfect alternating CO/olefin copolymers constitute an important class
of new materials. Their synthesis requires a catalyst; in general, the appl
ied catalytic systems are formed by a palladium(II) salt, modified by dipho
sphine or dinitrogen chelating ligands, in the presence of a Bronsted acid
as cocatalyst and, frequently, an oxidant such as 1,4-benzoqui none. Alcoho
lic medium is generally preferred. This overview will report on the main ca
talytic systems based on bidentate nitrogen-donor chelating ligands; partic
ular attention will be dedicated to the CO/styrene copolymerization. A deta
iled analysis of several parameters influencing the yield and the quality o
f CO/styrene polyketone will be presented, together with the discussion of
the control of the stereochemistry of the insertion of styrene in the growi
ng chain.