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For recent examples of addition reactions of nucleophiles to metal-containing zwitterionic intermediates, see: a) N. T. Patil, H. Wu, Y. Yamamoto, J. Org. Chem. 2005, 70, 4531-4534;
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For reviews on cycloaddition reactions of metal-containing zwitterionic intermediates, see: a) H. Kusama, N. Iwasawa, Chem. Lett. 2006, 35, 1082-1087;
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Ohe and co-workers studied extensively the synthesis of furylcarbene complexes through the 5-exo-dig cyclization of carbonyl enyne compounds; for a review, see: K. Miki, S. Uemura, K. Ohe, Chem. Lett. 2005, 34, 1068-1073.
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Ohe and co-workers studied extensively the synthesis of furylcarbene complexes through the 5-exo-dig cyclization of carbonyl enyne compounds; for a review, see: K. Miki, S. Uemura, K. Ohe, Chem. Lett. 2005, 34, 1068-1073.
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For recent reviews on platinum(II)-catalyzed reactions, see: a) C. Nevado, A. M. Echavarren, Synthesis 2005, 167-182;
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For other recent examples of 1,2-alkyl migrations in platinum-carbene intermediates, see: a) J. Sun, M. P. Conley, L. Zhang, S. A. Kozmin, J. Am. Chem. Soc. 2006, 128, 9705-9710;
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Another possible reaction pathway is the [4+2]c ycloaddition [4b] of a platinum-containing zwitterionic intermediate 3 with n-butyl vinyl ether to give the oxonium intermediate 11 directly. However, at present, we believe the [3+2]cyclo addition pathway to be the most plausible pathway in the present reaction on the basis of the experimental result shown in Table 1, entry 3. If the reaction proceeds through a [4+2]cyclo addition, a mixture of 2 and 8 should form from the oxonium intermediate 11 owing to the pseudosymmetric structure of 11. We are currently carrying out calculations of the reaction pathways to obtain further information on the exact mechanism of this reaction. For a discussion, see: B. F. Straub, Chem. Commun. 2004, 1726-1728, Chemical Equation Presented
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[4b] of a platinum-containing zwitterionic intermediate 3 with n-butyl vinyl ether to give the oxonium intermediate 11 directly. However, at present, we believe the [3+2]cyclo addition pathway to be the most plausible pathway in the present reaction on the basis of the experimental result shown in Table 1, entry 3. If the reaction proceeds through a [4+2]cyclo addition, a mixture of 2 and 8 should form from the oxonium intermediate 11 owing to the pseudosymmetric structure of 11. We are currently carrying out calculations of the reaction pathways to obtain further information on the exact mechanism of this reaction. For a discussion, see: B. F. Straub, Chem. Commun. 2004, 1726-1728. (Chemical Equation Presented)
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50
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53549124570
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It is likely that the 1,2-hydrogen-atom shift to the electron-deficient carbene carbon atom has a hydride-shift character, and that the electron-donating effect of the substituent at the propargylic position of substrates 1 (or the nBuO substituent in 12 a) promotes the 1,2-hydrogen-atom shift.
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It is likely that the 1,2-hydrogen-atom shift to the electron-deficient carbene carbon atom has a hydride-shift character, and that the electron-donating effect of the substituent at the propargylic position of substrates 1 (or the nBuO substituent in 12 a) promotes the 1,2-hydrogen-atom shift.
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0037131941
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For reviews on the [3+2]cycloa ddition of carbonyl ylide species derived from α-diazoketone derivatives with a Rh catalyst, see: a G. Mehta, S. Muthusamy, Tetrahedron 2002, 58, 9477-9504;
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For reviews on the [3+2]cycloa ddition of carbonyl ylide species derived from α-diazoketone derivatives with a Rh catalyst, see: a) G. Mehta, S. Muthusamy, Tetrahedron 2002, 58, 9477-9504;
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