A Study of the Mechanism of Platinum(II)/Tin(II) Dichloride Mediated Hydrogenation of Alkynes and Alkenes Employing Parahydrogen-Induced Polarization
✍ Scribed by Christina Deibele; Alexei B. Permin; Valery S. Petrosyan; Joachim Bargon
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 184 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
The mechanism of hydrogenation of alkynes catalyzed by the intermediates as cis-[H 2 Pt(PR 3 )(SnX 3 )(σ-alkenyl)(acetone)],
where the σ-alkenyl ligand originates from an insertion [(PR 3 ) 2 PtHX]/SnX 2 system (PR 3 = PPh 3 , PMePh 2 ; X = Cl, Br) has been studied by means of parahydrogen-induced reaction of the alkyne (1-phenyl-1-propyne, 1-phenyl-1butyne, diphenylacetylene, 3,3-dimethylbutyne). At elevated polarization of 1 H spectra (PHIP). Dihydride intermediates confirming the stepwise hydrogenation at room temperature temperatures, the hydrogenation in acetone proceeds as a cis-synchronous transfer of the two hydrogen atoms of were observed when the reaction was run in acetone. The obtained 1 H-PHIP spectra, together with NMR data for parahydrogen to the substrate molecule. A mechanism for this synchronous hydrogenation is suggested. related species, are consistent with the formulation of these