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Volumn 47, Issue 26, 2008, Pages 4903-4905

Platinum(II)-catalyzed reaction of γ,δ-ynones with alkenes for the construction of 8-oxabicyclo[3.2.1]octane skeletons: Generation of platinum-containing carbonyl ylides from acyclic precursors

Author keywords

Carbene ligands; Carbonyl ylides; Cycloaddition; Platinum; Ynones

Indexed keywords

CHEMICAL REACTIONS; ETHERS; HYDROCARBONS; HYDROGEN; OLEFINS; ORGANIC COMPOUNDS; PLATINUM; STYRENE;

EID: 53549135506     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200705129     Document Type: Article
Times cited : (70)

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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
    • [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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    • 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.
    • 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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