New atropisomeric bidentate bipyridine-based ligands (3,3’-(ethylenedioxy)-2,2’-bipyridine 3;3,3’-(propylenedioxy)-2,2’-bipyridine 4; 3,3’-(butylenedioxy)-2,2’-bipyridine 5) containing a bridge between the 3,3’ positions of the aromatic rings have been prepared. Together with the previously reported analogous ligands ((R)-3,3’-(1-methylethylenedioxy)-2,2’-bipyridine) 1 and ((S,S)-3,3’-(1,2-dimethylethylenedioxy)-2,2’-bipyridine) 2, they were used to synthesize the corresponding bis-chelated dicationic complexes [Pd(N–N)2][PF6] 2. Crystal structures and comparison of the data obtained by X-ray analysis on four of these complexes is reported. These palladium compounds were used as precatalysts in the CO/styrene and CO/4-Me-styrene copolymerization reactions, where they showed that small variations in the ligand backbone remarkably affects the productivity of the catalytic system.
New atropisomeric N-N ligands for CO/vinyl arene copolymerization reaction / J. DURAND; E. ZANGRANDO; CARFAGNA C; B. MILANI. - In: DALTON TRANSACTIONS. - ISSN 1477-9226. - STAMPA. - 16:(2008), pp. 2171-2182. [10.1039/b716656g]
New atropisomeric N-N ligands for CO/vinyl arene copolymerization reaction
CARFAGNA, CARLA;
2008
Abstract
New atropisomeric bidentate bipyridine-based ligands (3,3’-(ethylenedioxy)-2,2’-bipyridine 3;3,3’-(propylenedioxy)-2,2’-bipyridine 4; 3,3’-(butylenedioxy)-2,2’-bipyridine 5) containing a bridge between the 3,3’ positions of the aromatic rings have been prepared. Together with the previously reported analogous ligands ((R)-3,3’-(1-methylethylenedioxy)-2,2’-bipyridine) 1 and ((S,S)-3,3’-(1,2-dimethylethylenedioxy)-2,2’-bipyridine) 2, they were used to synthesize the corresponding bis-chelated dicationic complexes [Pd(N–N)2][PF6] 2. Crystal structures and comparison of the data obtained by X-ray analysis on four of these complexes is reported. These palladium compounds were used as precatalysts in the CO/styrene and CO/4-Me-styrene copolymerization reactions, where they showed that small variations in the ligand backbone remarkably affects the productivity of the catalytic system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.