Synthesis of two new families of fluorinated compounds: 1H,1H,2H,2H-perfluoro-3,5-alkyldiynols and 1H,1H-perfluoro-2,4-alkyldiynols and their acrylates and methacrylates
摘要:
The synthesis of two new families of compounds, 1H,1H,2H,2H-perfluoro-3,5-alkyldiynols and 1H,1H-perfluoro-2,4-alkyldiynols, and their acrylates and methacrylates, precursors of polymeric systems with important physical properties, is described. (C) 2004 Elsevier Ltd. All rights reserved.
The preparation of HCF2CdX and HCF2ZnX via direct insertion into the carbon halogen bond of CF2HY (Y=Br, I)
作者:Donald J. Burton、Greg A. Hartgraves
DOI:10.1016/j.jfluchem.2007.05.015
日期:2007.10
The difluoromethylcadmium and zinc reagents have been prepared in DMF via direct insertion of Cd-0 into the carbon halogen bond of CF2HY (Y = Br, I). These reagents are stable at 65-75 degrees C and exhibit prolonged stability and activity at room temperature. Metathesis of the difluoromethylcadmium reagents with Cu(I)X (X = Br, Cl) at -55 degrees C rapidly produces difluoromethylcopper. The copper reagent is significantly less stable than the cadmium or zinc reagent and rapidly decomposes at room temperature. The difluoromethylcadmium and copper reagents exhibit good reactivity with allylic halides, propargylic derivatives and 1-iodoalkynes to provide good yields of the corresponding difluoromethylalkenes, difluoromethylallenes and difluoromethyl-2-alkynes. Alkylation is successful only with reactive alkyl halides. Generally, the difluoromethylcopper reagent is more reactive than the difluoromethylcadmium reagent and generally exhibits higher regioselectivity in reactions that can occur by either alpha- or -gamma-attack. (C) 2007 Elsevier B.V. All rights reserved.
Stereoselective Synthesis of (<i>Z</i>)-Perfluoroalkyl-1-iodo-1-triisopropyl Silylalkenes: A Convenient Route to Perfluoroalkyl-Substituted Unsaturated Synthons
作者:Juan Francisco Chesa、Dolores Velasco、Francisco López-Calahorra
DOI:10.1080/00397910903161843
日期:2010.5.19
The quantitative and fully stereoselective synthesis of (Z)-perfluoroalkyl-1-iodo-1-triisopropylsilylalkenes and their easy, high-yielding transformation into the corresponding 1-iodo-2-perfluoroacetylenes and (Z)-2-perfluoroalkyl-1-iodo-1-alkenes, compounds of interest as synthons for classical organometallic chemistry or for metal-catalyzed coupling reactions, are discussed.