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Title: Pd(II) catalyzed transformation of Schiff bases in complexes of the type trans-[PdCl2(NH2Ar-X)2] (X = H, CH3, Cl): Reactivity with aldehydes and Heck coupling reaction
Authors: Kumari, Niraj
Yadav, Vinod Kumar
Záliš, Stanislav
Mishra, Lallan
Keywords: Schiff Base;Palladium;Crystal Structure;DFT Calculations;C-C Heck Coupling
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: Schiff bases of type (R-Ph-N=CH-Ph-CH=N-Ph-R), where, R = H (L1), CH3 (L2) and Cl (L3), in presence of cis-[Pd(en)Cl2] or [Pd(DMSO)2Cl2] (en = 1,2-diaminoethane, DMSO = dimethylsulphoxide) give trans-[PdCl2(NH2Ph)2] (1), trans-[PdCl2(NH2PhCH3)2] (2) and trans-[PdCl2(NH2PhCl)2] (3). The complexes are characterized using spectroscopic (IR, UV-vis and NMR) and X-diffraction techniques. The H-bonding interaction generates multinuclear supramolecular structure in complex (2) and (3). Complex (1) on reaction with benzaldehyde, salicylaldehyde and 4-carboxybenzaldehyde yields complexes of the type [PdCl2(PhN=CHPh)2] (4), [Pd(PhN=CHPhO)2] (5) and [PdCl2(PhN=CHPhCOOH)2] (6) respectively. The structures have been optimized using density functional theory at B3LYP level. Heck coupling reactions of bromobenzene with acrylonitrile and bromobenzene with ethyl acrylate in the presence of complexes (1), (2) and (3) have been carried out separately.
Page(s): 554-563
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(04) [April 2012]

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