Highly Regioselective Cyclotrimerization of 1-Perfluoroalkylenynes Catalyzed by Nickel
摘要:
We report the highly regioselective cyclotrimerization of the 1-perfluoroalkylenynes in the presence of Ni(PPh3)(4). The substituent effects on the reactivity of the enynes were investigated. We also succeeded in the nickel-catalyzed cocyclization of the 1-perfluoroalkylenynes with (trimethylsilyl)acetylene. The possible structures of the intermediates of the cyclotrimerization and the reasons for the observed high regioselectivity were discussed.
Hydroxyapatite-Supported Palladium-Catalyzed Efficient Synthesis of (<i>E</i>)-2-Alkene-4-ynecarboxylic Esters. Intense Fluorescene Emission of Selected Compounds
作者:Brindaban C. Ranu、Laksmikanta Adak、Kalicharan Chattopadhyay
DOI:10.1021/jo800209z
日期:2008.7.1
A simple procedure for the synthesis of substituted (E)-2-alkene-4-ynecarboxylic esters has been achieved using hydroxyapatite-supported palladium as efficient catalyst surface. The catalyst is recycled, and the turnover number (TON) based on Pd is 16000. A naphthyl-substituted derivative gives very intense fluorescence emission.