14220-64-5Relevant articles and documents
Synthesis and properties of new phosphorescent red light-excitable platinum(II) and palladium(II) complexes with schiff bases for oxygen sensing and triplet-triplet annihilation-based upconversion
Borisov, Sergey M.,Saf, Robert,Fischer, Roland,Klimant, Ingo
, p. 1206 - 1216 (2013)
New Pt(II) and Pd(II) complexes with donor-acceptor Schiff bases are conveniently prepared in only two steps. The complexes efficiently absorb in the red part of the spectrum (ε > 105 M-1 cm -1) and show moderate to strong
Anchoring of Pd on silica functionalized with nitrogen containing chelating groups and applications in catalysis
Lagasi, Matteo,Moggi, Pietro
, p. 61 - 72 (2002)
Pd-complexes of silica-anchored nitrogen containing chelating compounds were prepared by the following reactions: (a) synthesis of the Schiff-bases from 3-aminopropyltriethoxysilane and 2-acetylpyridine, 2-acetylpyrazine or 2,6-diacetylpyridine; (b) reduction of the Schiff-bases with NaBH4 in methanol; (c) cogelification with tetraethyl orthosilicate (TEOS); (d) reaction of the obtained functionalized silica with [PdCl2(PhCN)2] in CH2Cl2. The corresponding model ligands and palladium complexes were also prepared from the reaction of n-propylamine with the pyridine or pyrazine compound, followed by the reduction with NaBH4 and the reaction with [PdCl2(PhCN)2]. The products were characterized by BET, FTIR, GC-MS, 1H-NMR and elemental C-H-N analysis. The anchored Pd-complexes were tested as catalysts in: (a) the Heck reaction of iodobenzene with ethyl acrylate or styrene in the presence of tributylamine, as base, and toluene or p-xylene, as solvent; (b) the carbonylation reaction of iodobenzene with CO, at atmospheric pressure, in methanol in the presence of triethylamine or potassium acetate, as base. The catalysts were separated from the reaction mixtures and re-used many times. The best results were obtained in both reactions with the anchored Pd-complexes prepared from 2-acetylpyridine: 14 cycles in the Heck reaction (TON ? 4100 mmol product/mmol Pd) and 20 cycles in the carbonylation of iodobenzene (TON ? 2300 mmol product/mmol Pd).
Studies of thermal decomposition of palladium(II) complexes with olefin ligands
Sz?yk,Barwio?ek
, p. 85 - 89 (2009)
PdCl2(VTMS)2 (1), PdCl2(PTMSA)2 (2), PdCl2(DMB)2 (3) and PdCl2(DADMS)2 (4), where VTMS-trimethyl(vinyl)silane, DADMS-diallyldimethylsilane, PTMSA-1-phenyl-2
Synthesis of a Bolm's 2,2′-Bipyridine Ligand Analogue and Its Applications
Bedná?ová, Eva,Dra?ínsky, Martin,Malatinec, ?tefan,Císa?ová, Ivana,Lamaty, Frédéric,Kotora, Martin
supporting information, p. 2869 - 2878 (2018/08/17)
A new method of synthesis of an analogue of Bolm's 2,2′-bipyridine ligand based on the catalytic [2+2+2] cyclotrimerization of 1-halodiynes with nitriles was developed. Crucial step of the whole synthesis turned out to be homodimerization of a substituted 2-bromopyridine to the corresponding bipyridine, that was studied and optimized. The newly prepared bipyridine (S,S)-2 was then tested as a chiral ligand in metal-catalyzed enantioselective reactions. Out of the studied reactions the most promising results were obtained in epoxide ring opening (82% yield, 98% ee) and Mukaiyama aldol reaction (>96% yield, 99/1 dr, 92% ee). In the case of Mukaiyama-aldol reaction as well as in the Michael addition, novel ligand 2 proved its robustness compared to Bolm's ligand as it was less sensitive to the purity of used reagents. (Figure presented.).
Preparation and application of coconut shell activated carbon immobilized palladium complexes
Zhang, Yulian,Xiang, Shuanglong,Wang, Guoqing,Jiang, Hong,Xiong, Chunrong
, p. 1055 - 1063 (2014/04/03)
Coconut shell activated carbon (CSAC) granules were used as carriers to immobilize palladium complexes. Boehm titration showed that the hydroxyl content of the carbon surface reached 0.376 mmol g-1 after 20% HNO 3 treatment. Ethylenediamine, benzyl malononitrile and propyl malononitrile were successfully grafted onto the oxidized CSAC. The bidentate nitrogen ligands complexed Pd2+ samples were characterized by FT-IR, XPS, ICP and N2 adsorption-desorption. In oxidative carbonylation of phenol, three bidentate ligand grafted catalysts were evaluated in a high pressure reaction vessel. The results showed that the ethylenediamine grafted catalyst had a phenol conversion of 12.06% and a diphenyl carbonate (DPC) selectivity of 91.03%. In comparison, the benzyl malononitrile grafted catalyst displayed a phenol conversion of 12.00% and a DPC selectivity of 90.65%. The propyl malononitrile grafted catalyst displayed a phenol conversion of 6.22% and a DPC selectivity of 81.02%. Additionally, the ethylenediamine and the benzyl malononitrile grafted catalysts were also investigated in a continuous packed-bed reactor. The results showed that the phenol conversion and the DPC selectivity were comparative to those obtained in a high pressure reaction vessel. This journal is the Partner Organisations 2014.
