Novel phosphine ligands bearing 3(5)-pyrazolyl and 4-(2-amino)pyrimidinyl groups: Synthesis and coordination chemistry
摘要:
Novel triphenyl phosphine ligands bearing pyrazole or 2-aminopyrimidine groups in the ortho or meta position of one or three of the phenyl rings were obtained starting from the corresponding acyl derivatives Ph2P(o-C6H4-COCH3), Ph2P(m-C6H4-COCH3), Or P(m-C6H4-COCH3)(3)- Conversion of the acyl groups into 3-dimethylamino-2-propen-l-onyl units was achieved by reaction with HC(O-Me)(2)NMe2 which underwent ring closing with hydrazine or guanidine to yield the desired heterocycles. Two palladium complexes were synthesized using the coordinatively labile precursor (PhCN)(2)PdCl2, one of them could be characterized by X-ray structure analysis. (c) 2005 Elsevier B.V. All rights reserved.
Novel phosphine ligands bearing 3(5)-pyrazolyl and 4-(2-amino)pyrimidinyl groups: Synthesis and coordination chemistry
作者:Yu Sun、Antje Hienzsch、Jens Grasser、Eberhardt Herdtweck、Werner R. Thiel
DOI:10.1016/j.jorganchem.2005.08.032
日期:2006.1
Novel triphenyl phosphine ligands bearing pyrazole or 2-aminopyrimidine groups in the ortho or meta position of one or three of the phenyl rings were obtained starting from the corresponding acyl derivatives Ph2P(o-C6H4-COCH3), Ph2P(m-C6H4-COCH3), Or P(m-C6H4-COCH3)(3)- Conversion of the acyl groups into 3-dimethylamino-2-propen-l-onyl units was achieved by reaction with HC(O-Me)(2)NMe2 which underwent ring closing with hydrazine or guanidine to yield the desired heterocycles. Two palladium complexes were synthesized using the coordinatively labile precursor (PhCN)(2)PdCl2, one of them could be characterized by X-ray structure analysis. (c) 2005 Elsevier B.V. All rights reserved.
Variable coordination behaviour of pyrazole-containing N,P and N,P(O) ligands towards palladium(ii)
作者:Steven Kealey、Nicholas J. Long、Philip W. Miller、Andrew J. P. White、Peter B. Hitchcock、Antony Gee
DOI:10.1039/b704051b
日期:——
pzphos(O) towards palladium(II) has been investigated. Depending on the ligand to metal molar ratio employed in the reactions of palladium(II) with pzphos, either the 1 : 1 chelate [Pd(pzphos)Cl2] 1a or the 2 : 1 N,P chelate [Pd(pzphos)2]Cl2 1b was obtained. 1b contains two six-membered chelate rings in which the chlorides have been displaced from the inner coordination sphere of palladium. Exchange of