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Trans-PtH

Several hydrido(phenoxo) complexes of nickel, trans-[NiH(OPh)L2] (6) (a L= P Prs b L = PCys c L = PBnj), have been prepared by the metathesis reaction of NaOPh with trans-[NiHClL2] (Eq. 6.6). The complex 6c was obtained as the phenol-solvated complex whose structure was determined by X-ray analysis [9]. An analogous platinum complex trans-[PtH(OPh)(PEt3)2] (7) was prepared by the reaction of trans-[PtH(N03)(PEt3)2] with NaOPh (Eq. 6.7). The complex 7 is air-stable but thermally sensitive and decomposes at room temperature. The structure was elucidated by X-ray analysis [10]. [Pg.173]

Among these catalysts, systems obtained by the reaction between trans-[PtH(Cl)(PR3)2] (R = Me and Et) and 1 equiv. of NaOH are the most active [72]. Eor... [Pg.195]

PtMe(C00H)(diphos) (diphos=Ph2PCH2CH2PPh2) (8) and trans-PtCl-(COgH)(PEt )2 (9) are thermally quite stable whereas trans-[PtH-(COOH)La] in solution is unstable manifests a dramatic trans-ef-... [Pg.88]

Involvement of trans-PtH2L2 in the catalytic cycle was confirmed by the wgs reaction, employing trans-PtH2L2 as the catalyst precursor, from which was also isolated trans-[PtH(C0)L]0H as its BPh salt. The following two processes (eq. 15,16) would complete the catalytic cycle. The formation of Pt3(C0)3L4 (v(C0) 1840,1770 enf ) in the reaction of PtH2L2 with CO is considered indirect evidence for the intermediacy of the coordinatively unsaturated Pt-(C0)L2. A simplified scheme of the cycle may then be depicted... [Pg.88]

In the case of H20 activation as the first step prior to addition of CO, Laine and Wilson77 mentioned three examples of complexes that activated H20 trans-PtH(OH)[P(iPr)3],40 HRh(OH)[P(iPr)3]3,47 and HW(OH)(CO)3(PCy3).68 These concepts help in visualizing approaches to prepare active catalysts for homogeneous water-gas shift. [Pg.137]

Solvato complexes of platinum(II) of the type fraws-[PtY(solvent)L2]+ (Y = hydride, alkyl, or aryl solvent = alcohol or ketone L = tertiary phosphine or arsine) have been known since 1961.1 They are obtained by halogen abstraction from the corresponding halo complexes tran.s-[PtXYL2] in the presence of the desired solvent.2 The methanol complex is also rapidly and quantitatively formed when trans-[PtH(N03)(PEt3)2] is dissolved in this solvent.2... [Pg.134]

The cation trans-[PtH(CH3OH)(PEt3)2]+ is obtained from trans-[PtHCl(PEt3)2] by the general method just outlined.2 Its normal alkene and alkyne insertion reactions with methyl acrylate,3 diphenylacetylene,4 and... [Pg.134]

Hydrido-hydroxo complexes of platinum(II) are believed to be formed by reversible oxidative addition of water to bis(ligand) platinum(O) complexes containing bulky tertiary phosphines (22). Although the equilibrium favors the platinum(O) complex, trans-[PtH(OH)(P(iso-Pr)3)2] has been isolated and identified spectroscopically (see Equation 5) ... [Pg.207]

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See also in sourсe #XX -- [ Pg.305 ]



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