TY - JOUR
T1 - A synthetic route to alkyl-pt(III) dinuclear complexes from olefins and its implication on the olefin oxidation catalyzed by amidate-bridged pt(III) dinuclear complexes
AU - Matsumoto, Kazuko
AU - Nagai, Yuji
AU - Matsunami, Jun
AU - Mizuno, Kazuhiro
AU - Abe, Takeya
AU - Somazawa, Ryosuke
AU - Kinoshita, Jun
AU - Shimura, Hideo
PY - 1998/4/1
Y1 - 1998/4/1
N2 - Amidate-bridged Pt(III) dinuclear complexes [Pt2(NH3)4(Am)2(H2O)2]4+ (Am = amidate ligand) catalyze oxidation of olefins in acidic aqueous solution. Linear olefins are oxidized to ketones, whereas cyclic olefins are oxidized to epoxides. GC-MS analysis of the oxidation products obtained from the reaction in H218O showed that the oxygen atoms in the products are exclusively from water, suggesting that the reaction mechanism is basically similar to that of the Wacker reaction. In accordance with this mechanism, pivalamidate-bridged Pt(III) complex [Pt(III)2(NH3)4((CH3)3CCONH)2(H2O)2]4+ has been found to react with olefins to give alkyl complexes. Reactions with 4-penten-1-ol and ethylene glycol vinyl ether in acidic aqueous solution gave [Pt(III)2(NH3)4((CH3)3CCONH)2(CH2CH(CH2)3O)](NO3)3·H2O (7) and [Pt(III)2(NH3)4((CH3)3CCONH)2(CH2CHO)]- (NO3)3·H2O (9), respectively. The two compounds have been structurally confirmed by X-ray diffraction analysis and 1H, 13C, and 195Pt NMR spectroscopy. The 1H NMR of 9 shows that both π- and σ-complexes exist in equilibrium in D2O, although the X-ray structure is close to the σ-complex. High electrophilicity of the σ-carbon atoms of the compounds has been shown in the reactions with OH-. The above reactions with olefins can be a general route to prepare dimeric Pt(III)-alkyl complexes.
AB - Amidate-bridged Pt(III) dinuclear complexes [Pt2(NH3)4(Am)2(H2O)2]4+ (Am = amidate ligand) catalyze oxidation of olefins in acidic aqueous solution. Linear olefins are oxidized to ketones, whereas cyclic olefins are oxidized to epoxides. GC-MS analysis of the oxidation products obtained from the reaction in H218O showed that the oxygen atoms in the products are exclusively from water, suggesting that the reaction mechanism is basically similar to that of the Wacker reaction. In accordance with this mechanism, pivalamidate-bridged Pt(III) complex [Pt(III)2(NH3)4((CH3)3CCONH)2(H2O)2]4+ has been found to react with olefins to give alkyl complexes. Reactions with 4-penten-1-ol and ethylene glycol vinyl ether in acidic aqueous solution gave [Pt(III)2(NH3)4((CH3)3CCONH)2(CH2CH(CH2)3O)](NO3)3·H2O (7) and [Pt(III)2(NH3)4((CH3)3CCONH)2(CH2CHO)]- (NO3)3·H2O (9), respectively. The two compounds have been structurally confirmed by X-ray diffraction analysis and 1H, 13C, and 195Pt NMR spectroscopy. The 1H NMR of 9 shows that both π- and σ-complexes exist in equilibrium in D2O, although the X-ray structure is close to the σ-complex. High electrophilicity of the σ-carbon atoms of the compounds has been shown in the reactions with OH-. The above reactions with olefins can be a general route to prepare dimeric Pt(III)-alkyl complexes.
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U2 - 10.1021/ja971129k
DO - 10.1021/ja971129k
M3 - Article
AN - SCOPUS:0032054563
SN - 0002-7863
VL - 120
SP - 2900
EP - 2907
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 12
ER -