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Synthesis of Osmapyridiniums by [4+2] Cycloaddition Reac- tion between Osmium Alkenylcarbyne and Nitriles 被引量:1
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作者 刘斌 赵茜怡 +4 位作者 汪慧娟 陈金香 曹晓宇 曹泽星 夏海平 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第9期2158-2168,共11页
A novel [44-2] cycloaddition reaction between osmium alkenylcarbyne complex [OsHC12{-CC(PPh3)-- CHPh}(PPh3)2]+BF4 (1) and nitriles (acetonitrile and benzonitrile) provided metallapyridiniums [OsC12{= CHC(PPh... A novel [44-2] cycloaddition reaction between osmium alkenylcarbyne complex [OsHC12{-CC(PPh3)-- CHPh}(PPh3)2]+BF4 (1) and nitriles (acetonitrile and benzonitrile) provided metallapyridiniums [OsC12{= CHC(PPh3)=CPhCR=NH}(PPh3)2]+ BF4 (R-CH3 (2), Ph (3)) and OsC13 {=CHC(PPh3)=CPhCPh=NH}- (PPh3) (4). A possible mechanism was proposed. Treatment of 2 with n-BuLi and NEt3 afforded osmapyridines OsClz{=CHC(PPh3)=CPhCCH3=N}(PPh3)2 (5) and [OsCl=CHC(PPh3)=CPhCCH3=N}(C6HsN)(PPh3)2]' BF4 (6). The ligands of osmapyridiniums 2 and 4 were changed, thus providing a series of osmapyridiniums [OsCI(SCN){=CHC(PPh3)=CPhC(CH3)=NH}(PPh3)2]+Cl(7), OsCI(SCN)2{=CHC(PPh3)=CPhC(CH3)= N H } (PPh3) (8), Os(SCN)3 { -- CHC(PPh3) = CPhC(CH3) = NH } (PPh3) (9), [OsCl { = CHC(PPh3) = CPhC(CH3) = NH}(CH3CN)(PPh3)2]+( BF4 )2 (lO), [OsCl{=CHC(PPh3)=CPhC(CH3)--NH}-(q2-l,10-phenanthroline)(PPh3)]+ ( BF4 )el (11), [OsCl{=CHC(PPh3)=CPhC(eH3)=NH}(r/2-8-hydroxyquinoline) (PPh3)]+ BF4 (12), and [Os{ =CHC(PPh3)=CPhCPh=NH}(CH3CN)3(PPh3)]+( BF/)3 (13). Most of these products were characterized by NMR spectroscopy, elemental analysis and single crystal X-ray diffraction. 展开更多
关键词 CYCLOADDITION NITRILE metallapyridinium metallapyridine OSMIUM
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