Supported by the Spanish Direccion General de Ensenanza Superior e Investigacion Cientifica, Ministerio de Educacion y Cultura (Projects PB96-0852 and BQU2000-1500). E. Q. acknowledges a doctoral fellowship from the same source.
New stereoselective $$C_{sp^2 } - C_{sp^3 }$$ coupling: Catalytic iodomethylation of acetylene with methyl iodide into E-1-iodopropene
作者:S. A. Mitchenko、O. V. Khazipov、T. V. Krasnyakova
DOI:10.1134/s0023158414030094
日期:2014.5
The catalytic addition of methyl iodide to acetylene yielding E-1-iodopropene has been discovered. The reaction competes with the formation of E,E-1,4-diiodobuta-1,3-diene. The key intermediate in these reactions is the methylvinyl derivative of PtIV resulting from acetylene iodoplatination by the PtIV methyl complex forming in the equilibrium process. The \(C_sp^2 } - C_sp^3 }\) coupling product
Highly Selective Catalytic Synthesis of (E,E)-1,4-Diiodobuta-1,3-diene via Atom-Efficient Addition of Acetylene and Iodine: A Versatile (E,E)-1,3-Diene Building Block in Cross-Coupling Reactions
reported for the synthesis of (E,E)-1,4-diiodobuta-1,3-diene from very simple starting materials (acetylene and I2). A pure crystalline product was obtained in a green chemical procedure utilizing the key advantages of highly selective Pt-catalyzed transformation and 100% atom efficiency of the addition reaction. The Pt catalyst was recovered and re-used in the reaction without a noticeable loss of
Platinum-catalyzed addition of iodomethane to acetylene
作者:S. A. Mitchenko、O. V. Khazipov、T. V. Krasnyakova
DOI:10.1007/s11172-013-0128-8
日期:2013.4
The reaction of iodomethane and acetylene in the presence of PtII and NaI in acetone gives (E)-1-iodopropene. A possible mechanism involves the intermediate formation of a PtIV methyl vinyl derivative by the iodoplatination of acetylene with a reversibly formed a PtIV methyl complex and assumes the catalytic character of the process.
在丙酮中,碘甲烷和乙炔在 PtII 和 NaI 的存在下发生反应,生成 (E)-1-碘丙烯。一种可能的机理是,乙炔与可逆形成的 PtIV 甲基复合物发生碘化反应,中间形成 PtIV 甲基乙烯基衍生物,并假定该过程具有催化特性。
New Transmembrane Polyene Bolaamphiphiles as Fluorescent Probes in Lipid Bilayers
Inspired by Archaebacterial lipids, transmembraneprobes anchor a sensing fluorescentpolyene with Ångström resolution deep within a lipid layer. These new bolaamphiphiles are obtained in good yields from a double cross-coupling between esters with a terminal acetylene group and conjugated 1,ω-dihalopolyenes, followed by partial reduction of the triple bond.