A series of cationic palladium complexes of general formula [Pd(Me)(MeCN)(N-N)][PF6] (N-N = (phen) 1a, 4,7-dichloro-1,10-phenanthroline (4,7-Cl2-phen) 2a, 4,7-diphenyl-1,10-phenanthroline (4,7-Ph2-phen) 3a, 4-methyl-1,10-phenanthroline (4-Me-phen) 4a, 4,7-dimethyl-1,10-phenanthroline (4,7-Me2-phen) 5a, 5,5,6,6tetrafluoro-5,6-dihydro-1,10-phenanthroline (F4-phen) 6a, containing different substituted phenanthroline ligands, have been prepared from the corresponding neutral chloro derivatives [Pd(Me)(Cl)(N-N)], (1b-6b). The X-ray crystal structure of [Pd(Cl)2(4,7-Cl2-phen)] (2b’) was determined. DFT calculations show that the electron density on the metal is tuned by the substituents on the ligands. The catalytic behavior of complexes 1a-6a in the CO/styrene and CO/p-Me-styrene copolymerizations was studied in detail, showing that the generated catalysts are active for at least 90 h, yielding copolymers of high molecular weight. A firm correlation between the electron density on palladium on the one hand and the catalytic activity of the complexes and the molecular weight and the stereochemistry of the polyketones synthesized on the other hand has been established: the catalyst containing the F4-phen is thus far the most active among those tested, yielding the syndiotactic CO/styrene copolymer with a stereoregularity of 96% (uu triad) and with an Mw value of 1000000.

Long Lived Palladium Catalysts for CO/Vinyl Arene Polyketones Synthesis: a Solution to Deactivation Problems

CARFAGNA, CARLA;
2006

Abstract

A series of cationic palladium complexes of general formula [Pd(Me)(MeCN)(N-N)][PF6] (N-N = (phen) 1a, 4,7-dichloro-1,10-phenanthroline (4,7-Cl2-phen) 2a, 4,7-diphenyl-1,10-phenanthroline (4,7-Ph2-phen) 3a, 4-methyl-1,10-phenanthroline (4-Me-phen) 4a, 4,7-dimethyl-1,10-phenanthroline (4,7-Me2-phen) 5a, 5,5,6,6tetrafluoro-5,6-dihydro-1,10-phenanthroline (F4-phen) 6a, containing different substituted phenanthroline ligands, have been prepared from the corresponding neutral chloro derivatives [Pd(Me)(Cl)(N-N)], (1b-6b). The X-ray crystal structure of [Pd(Cl)2(4,7-Cl2-phen)] (2b’) was determined. DFT calculations show that the electron density on the metal is tuned by the substituents on the ligands. The catalytic behavior of complexes 1a-6a in the CO/styrene and CO/p-Me-styrene copolymerizations was studied in detail, showing that the generated catalysts are active for at least 90 h, yielding copolymers of high molecular weight. A firm correlation between the electron density on palladium on the one hand and the catalytic activity of the complexes and the molecular weight and the stereochemistry of the polyketones synthesized on the other hand has been established: the catalyst containing the F4-phen is thus far the most active among those tested, yielding the syndiotactic CO/styrene copolymer with a stereoregularity of 96% (uu triad) and with an Mw value of 1000000.
DURAND J; ZANGRANDO E; STENER M; FRONZONI G; CARFAGNA C.; BINOTTI B; KAMER P.C.J; MULLER C; CAPORALI M; VAN LEEUWEN P.W.N.M; VOGT D; MILANI B
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/394581
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