97775-33-2Relevant academic research and scientific papers
Organometallic complexes of palladium (II) derived from 2,6-diacetylpyridine dimethylketal
Vicente, Jose,Arcas, Aurelia,Julia-Hernandez, Francisco,Bautista, Delia,Jones, Peter G.
, p. 3066 - 3076 (2010/10/04)
PdCl2 reacts with 2,6-diacetylpyridine(dap) (1:1) in refluxing MeOH to give the pincer complex [Pd(O1,N1,C 1-L)Cl](1) and (QH)2[{PdCl2(μ-Cl)}]2 (2), where L is the monoanionic ligand resulting from deprotonation of the acetyl methyl group of the monoketal of dap and QH is C5H 3NH{C-(OMe)Me}2-2,6, the diketal of Hdap+. Reaction of 2 with NEt3 (1:2) in MeOH affords Q = C5H 3N{C(OMe)2Me}2-2,6(3). Complex 1 reacts with 2 equiv of RNC at 0 °C to give trans-[Pd(C1-L)Cl(CNR) 2](R = Xy = 2,6-dimethylphenyl(4a), tBu (4b)) but at room temperature affords [Pd(O2, C2-LR)Cl(CNR)](R = Xy (5a), tBu(5b)). The ligand LR results from the insertion of one isocyanide into the Pd-C bond plus a tautomerization process from η-ketoimine to β-ketoenamine and coordinates in 5 through the carbonyl oxygen atom (O2) and the inserted isocyanide carbon atom (C2). The reaction of 1 with 1 equiv of RNC at 0 °C leads to a mixture of [Pd (N1,C1-L)Cl(CNR)] (R = Xy (6a), tBu (6b); 85-90%), 1, and 4, but at room temperature gives the pincer complex [Pd (O1,N1,C2-LR)Cl] (R = Xy (7a), tBu (7b)), resulting from insertion/tautomerization processes similar to that leading to 5. Complex 7 reacts at 0 °C (1) with 2 equiv of RNC to give trans-[Pd (C2-LR)Cl (CNXy) 2] (R = Xy (8a), tBu (8b)) or (2) with 1 equiv of tBuNC to afford 5b. The reaction of 1 (1) with [Tl(acac)] gives [Pd(N1,C1-L)(acac)] (9); (2) with chelating ligands N ∧N affords [Pd(C1-L)Cl(N∧N)](N ∧N = 2,2'-bipyridine = bpy (10), 4,4'-di-tert-butyl-2,2'- bipyridine = dbbpy (11)); (3) with 1 equiv of PPh3 gives, in the same way as with isocyanides, an equilibrium mixture of [Pd(N1,C 1-L)Cl(PPh3)] (12), 1, and trans-[Pd(C1-L)Cl (PPh3)2](13), which is the only product when 2 equiv of PPh3 is added to the reaction mixture; and(4) with excess PPh 3 affords the monoketal of dap, C5H3N{C(O)Me-2} {C(OMe)2Me-6}(14), and [Pd(PPh3)4]. The crystal structures of complexes 1, 2, 5b, 6a, and 7a have been determined.
Synthesis and characterization of novel five-membered palladacycles
Hamad Elgazwy, Abdel-Sattar S.
, p. 3667 - 3674 (2010/03/04)
3-(2-Chloroquinolin-3-yl)-1,5-bis(3,4,5-trimethoxy-phenyl)-pentane-2,4-dione derivatives 3a-b were conveniently synthesized in excellent yields (82% each) by tandem Knoevenagel condensation reactions of 2-chloro-3-carbaldehyde-quinoline 1a-b with 3,4,5-tr
Reactivity of [Pd{CH2C(O)Me}Cl]Mn toward isocyanides
Vicente, Jose,Areas, Aurelia,Fernandez-Hernandez, Jesus M.,Bautista, Delia,Jones, Peter G.
, p. 2516 - 2527 (2008/10/09)
The capacity of [Pd{CH2C(O)Me}Cl]n to prepare chloro-monoacetonyl or monoacetonyl palladium (II) complexes was analyzed. The established synthetic procedures for these complexes invariably involve the presence of other strongly coordinated ligands. The thermal transformation of these compounds into C-palladated β-ketoenamine complexes resulting from insertion of one molecule of the isocyanide followed by a β-ketoimine to β-ketoenamine tautomerization processes. The resulting complexes were the first palladium compounds containing such ligands acting as a chelate.
Electrochemical Preparation of Tetrakis(isocyanide)dipalladium(I) Dichloride
Yamamoto, Yasuhiro,Takahashi, Katsuo,Yamazaki, Hiroshi
, p. 2665 - 2666 (2007/10/02)
The electrochemical behavior of PdCl2(RNC)2 (1) has been investigated in acetonitrile at Pt and Hg electrodes.The cyclic voltammogram of 1 showed a reduction wave at ca -1.2 V, corresponding to a two-electron transfer.Coulometric reduction of 1 at the Pt electrode gave a binuclear complex, Pd2Cl2(RNC)4 (2).A similar reaction at the Hg electrode gave 2 in a relatively low yield.A Pt electrode was superior to a Hg one in the electrochemical synthesis of 2.The polarogram of 1 at a Hg electrode suggested a CE mechanism of the electrode ration.
Dichlorotetrakis(isocyanide)dipalladium(I) Containing a Metal-Metal Bond
Yamamoto, Yasuhiro,Yamazaki, Hiroshi
, p. 1843 - 1844 (2007/10/02)
The structure of 2> has been determined by X-ray diffraction.A metal-metal bond joins two Pd atoms, each of which possesses an essentially square-planar coordinate site.The photochemical reaction of 2> in CH2Cl2 led to a cleav
