Oxidative addition of some mono, di or tetra ...
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| Title | Oxidative addition of some mono, di or tetra haloalkanes to organoplatinum(II) complexes. |
| Author(s) | B. Momeni, M. Rashidi, M. Jafari, B. Patrick, A. Abd-El-Aziz |
| Journal | Section Title: Organometallic and Organometalloidal Compounds, Journal of Organometallic Chemistry |
| Date | 2012 |
| Volume | 700 |
| Issue | |
| Start page | 83 |
| End page | 92 |
| Abstract | Dimethylplatinum(II) complexes [PtMe2(NN)] {NN = bpy (2,2'-bipyridine), phen (1,10-phenanthroline) or bu2bpy (4,4'-di-tert-butyl-2,2'-bipyridine)} were reacted with alkyl halides (RX = EtI or EtBr, NN = bu2bpy; RX = nBuBr, NN = bpy; RX = CHPh2Br, NN = bpy, phen, or bu2bpy) to yield the Pt(IV) complexes [PtMe2RX(NN)]. On the basis of NMR data, the Pt(IV) product of each reaction contains almost exclusively the kinetic trans isomer, and only in a few cases, very small traces of the thermodn. cis isomers are obsd. The binuclear complexes [Pt2Me4Br2{μ-(CH2)2}(NN)2] (NN = bpy, phen) were obtained from reaction of [PtMe2(NN)] with 1,2-dibromoethane. Notably, the mononuclear complex fac-[PtMe3Br(bpy)], obtained as a byproduct during the reaction of [PtMe2(bpy)] with 1,2-dibromoethane, was characterized by x-ray crystallog. from the reaction of [PtMe2(bpy)] with 1,2-dibromoethane. On the other hand, the reaction of [PtMe2(bu2bpy)] with 1,2-dibromoethane resulted in formation of the mononuclear complex trans-[PtMe2Br{(CH2)2Br}(bu2bpy)]. The reaction of [PtMe2(NN)] with 1,2-bis(dibromomethyl)xylene in a 1:1 or 2:1 mol ratio afforded the mononuclear complexes [PtMe2(CHBr-o-C6H4CHBr2)Br(NN)] (NN = bpy, phen, or bu2bpy) or binuclear complexes [Pt2Me4Br2{μ-o-(CHBr)2C6H4}(NN)2] (NN = bpy, or phen), resp. Finally, 1,3-dibromobutane was oxidatively added to the organoplatinum(II) complexes [PtR2(NN)] (R 2 = (CH2)4, NN = bpy, or phen; R = Me; NN = bpy) via an SN2 mechanism from the less sterically hindered C-Br side to yield the complexes trans-[PtR2Br{(CH2)2CHBrCH3}(NN)]. The products were fully characterized by 1H and 13C NMR spectroscopy and elemental anal. The platinacycle complex [Pt(CH2)4(bpy)] was shown to react faster, as compared to the di-Me analog complex [PtMe2(bpy)], by a factor of 3.8-4.2. The reactions of [Pt(CH2)4(bpy)] or [Pt(CH2)4(phen)] with 1,3-dibromobutane were faster as compared to those with 1,4-dibromobutane, due to the activation effect of the platinum. [on SciFinder(R)] |
| DOI | 10.1016/j.jorganchem.2011.11.018 |
| ISSN | 0022-328X |
Using APA 6th Edition citation style.
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