Pd-Catalyzed Efficient One-Pot Sequential Cross-Coupling Reactions of Aryl Dihalides
作者:Xiaoming Zhang、Ailing Liu、Wanzhi Chen
DOI:10.1021/ol801589p
日期:2008.9.1
The palladium complex containing N-heterocyclic carbene ligands catalyzes one-pot sequential Heck/Suzuki, Heck/Heck, and Heck/Sonogashira coupling reactions of aryl dihalides to afford unsymmetrically substituted arenes in excellent yields.
Chemoselective Oxidation of Carbon-Carbon Double or Triple Bonds to 1,2-Diketones with DMSO-Based Reagents
作者:Mehman S. Yusubov、Victor D. Filimonov、Valentina P. Vasilyeva、Ki-Whan Chi
DOI:10.1055/s-1995-4094
日期:1995.10
HBr/DMSO selectively oxidizes the double bond in (E)-1-(2-phenylethylen)-4-(phenylethynyl)benzene (1) to 1,2-diketone 2. However, I2/DMSO and PdCl2/DMSO oxidize only the triple bond in 1 to 1,2-diketone 3. A similar trend of chemoselectivity is shown for the oxidation of (E)-1,4-diphenyl-1-buten-3-yne (6) with the DMSO-based reagents.