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Rhodium- and Palladium-Catalyzed 1,5-Substitution Reactions of 2-En-4-yne Acetates and Carbonates with Organoboronic Acids

Ucuncu, Muhammed; Karakus, Erman; Kus, Melih; Akpinar, Gurkan Eray; Aksin-Artok, Oezge; Krause, Norbert; Karaca, Sila; Elmaci, Nuran; Artok, Levent


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        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Ucuncu, Muhammed"
      }, 
      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Karakus, Erman"
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      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Kus, Melih"
      }, 
      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Akpinar, Gurkan Eray"
      }, 
      {
        "affiliation": "Dortmund Univ Technol, D-44227 Dortmund, Germany", 
        "name": "Aksin-Artok, Oezge"
      }, 
      {
        "affiliation": "Dortmund Univ Technol, D-44227 Dortmund, Germany", 
        "name": "Krause, Norbert"
      }, 
      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Karaca, Sila"
      }, 
      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Elmaci, Nuran"
      }, 
      {
        "affiliation": "Izmir Inst Technol, Fac Sci, Dept Chem, TR-35430 Izmir, Turkey", 
        "name": "Artok, Levent"
      }
    ], 
    "description": "Two methods involving the rhodium-catalyzed reaction of 2-en-4-yne acetates and the palladium-catalyzed reaction of 2-en-4-yne carbonates with organoboronic acids were investigated; both afforded exclusively the (E)-configured vinylallenes. The coordinative interaction of the rhodium with the acetate group promoted the delta-elimination of Rh(I)-OAc from the alkenylrhodium intermediate II in both syn and anti modes, with the syn-elimination being the major path. DFT calculations revealed that a conformer of this intermediate (II), which can lead to the (E)-configured vinylallene product via the syn-elimination mode, is energetically the most favorable conformer. The rhodium-catalyzed procedure is not applicable to reactions involving (E)-configured enyne acetates, because the geometry of the alkenylrhodium intermediate that is derived from the corresponding (E)-enyne acetate would not allow such coordinative interaction to occur, The palladium-catalyzed method, which proceeds through formation of the c-vinylallenylpalladium intermediate, B, is suitable for both the (E)- and (Z)-configured enyne carbonates and appears to have a wider scope for both organoboronic acids and enyne substrates. The palladium-catalyzed reaction of an enantiomerically enriched enyne carbonate proceeded with racemization.", 
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      "issue": "15", 
      "pages": "5959-5971", 
      "title": "JOURNAL OF ORGANIC CHEMISTRY", 
      "volume": "76"
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    "publication_date": "2011-01-01", 
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    "title": "Rhodium- and Palladium-Catalyzed 1,5-Substitution Reactions of 2-En-4-yne Acetates and Carbonates with Organoboronic Acids"
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