Abstract:Die Umsetzung von Bis(1,1′‐triphenylmethyl‐imidazol‐4‐yl)alkanen ((CH2)n verbrückte Imidazole L(CH2)nL, n = 3–6) mit den chloroverbrückten Komplexen [R3P(Cl)M(μ‐Cl)M(Cl)PR3] (M = Pd, Pt; R = Et, Pr, Bu) liefert die zweikernigen Verbindungen [Cl2(R3P)M–L(CH2)nL–M(PR3)Cl2] 1–17. Die Strukturen von [Cl2(Et3P)Pd–L(CH2)3L–Pd(PEt3)Cl2] (1), [Cl2(Bu3P)Pd–L(CH2)4L–Pd(PBu3)Cl2] (10), [Cl2(Et3P)Pd–L(CH2)5L–Pd(PEt3)Cl2] (3) und [Cl2(Et3P)Pt–L(CH2)3L–Pt(PEt3)Cl2] (13) mit trans‐Cl–M–Cl Gruppierung wurden jeweils röntgenog… Show more
“…The chelate effect confers the complexes high thermal stability and, as a result, broadens their potential catalytic applications. Most of the polycarbenes reported so far are bidentate (C, C) biscarbene, or pincer (tridentate-mer, C, N, C) ligands (Scheme ) which were initially coordinated to palladium and subsequently to other Pt-group metals such as Rh, ,,,,,, Ru, , and Ir. ,,, The catalytic properties of these metal complexes were explored in a variety of reactions (hydrogen transfer, ,, alkene oxidation, hydrosilylation, ,, C−C couplings, ,, hydroformylation, etc.). 1 …”
Section: Introductionmentioning
confidence: 99%
“…Most of the polycarbenes reported so far are bidentate (C, C) biscarbene, or pincer (tridentatemer, C, N, C) ligands (Scheme 1) which were initially coordinated to palladium and subsequently to other Pt-group metals such as Rh, 3,5,6,8,9,15,18 Ru, 2,7 and Ir. 10,15,19,20 The catalytic properties of these metal complexes were explored in a variety of reactions (hydrogen transfer, 2,5,19 alkene oxidation, 2 hydrosilylation, 5,10,17 C-C couplings, 4,13,21 hydroformylation, 18 etc.). Despite the fact that the number of polyheterocyclic carbenes is continuously increasing, the design of such ligands with a tripodal topology is restricted to a few articles describing their coordination to Fe, 22 Ag, 11 and Tl.…”
Two tripodal trisimidazolium ligand precursors have been tested in the synthesis of new N-heterocyclic carbene rhodium and iridium complexes. [Tris(3-methylbenzimidazolium-1-yl)]methane sulfate gave products with coordination of the decomposed precursor. [1,1,1-Tris(3-butylimidazolium-1-yl)methyl]ethane trichloride (TIMEH(3)(Bu)) coordinated to the metal in a chelate and bridged-chelate form, depending on the reaction conditions. The crystal structures of two of the products are described. The compounds resulting from the coordination with TIME(Bu) were tested in the catalytic hydrosilylation of terminal alkynes.
“…The chelate effect confers the complexes high thermal stability and, as a result, broadens their potential catalytic applications. Most of the polycarbenes reported so far are bidentate (C, C) biscarbene, or pincer (tridentate-mer, C, N, C) ligands (Scheme ) which were initially coordinated to palladium and subsequently to other Pt-group metals such as Rh, ,,,,,, Ru, , and Ir. ,,, The catalytic properties of these metal complexes were explored in a variety of reactions (hydrogen transfer, ,, alkene oxidation, hydrosilylation, ,, C−C couplings, ,, hydroformylation, etc.). 1 …”
Section: Introductionmentioning
confidence: 99%
“…Most of the polycarbenes reported so far are bidentate (C, C) biscarbene, or pincer (tridentatemer, C, N, C) ligands (Scheme 1) which were initially coordinated to palladium and subsequently to other Pt-group metals such as Rh, 3,5,6,8,9,15,18 Ru, 2,7 and Ir. 10,15,19,20 The catalytic properties of these metal complexes were explored in a variety of reactions (hydrogen transfer, 2,5,19 alkene oxidation, 2 hydrosilylation, 5,10,17 C-C couplings, 4,13,21 hydroformylation, 18 etc.). Despite the fact that the number of polyheterocyclic carbenes is continuously increasing, the design of such ligands with a tripodal topology is restricted to a few articles describing their coordination to Fe, 22 Ag, 11 and Tl.…”
Two tripodal trisimidazolium ligand precursors have been tested in the synthesis of new N-heterocyclic carbene rhodium and iridium complexes. [Tris(3-methylbenzimidazolium-1-yl)]methane sulfate gave products with coordination of the decomposed precursor. [1,1,1-Tris(3-butylimidazolium-1-yl)methyl]ethane trichloride (TIMEH(3)(Bu)) coordinated to the metal in a chelate and bridged-chelate form, depending on the reaction conditions. The crystal structures of two of the products are described. The compounds resulting from the coordination with TIME(Bu) were tested in the catalytic hydrosilylation of terminal alkynes.
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