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.
Metal-Free Iodoperfluoroalkylation: Photocatalysis versus Frustrated Lewis Pair Catalysis
作者:Constantin Czekelius、Lucas Helmecke、Michael Spittler、Bernd M. Schmidt
DOI:10.1055/s-0040-1707232
日期:2021.1
Professor Rolf Huisgen Abstract A comparison of two catalytic, metal-free iodoperfluoroalkylation protocols is presented. FrustratedLewispairs [ t Bu3P/B(C6F5)3] or phosphines/phosphites under visible light irradiation efficiently mediate the functionalization of non-activated alkenes and alkynes. A comprehensive account of the corresponding substrate scopes as well as insights into the mechanistic details
纪念Rolf Huisgen教授 抽象 比较了两种催化的,无金属的碘代氟烷基化方案。沮丧的路易斯对[ t Bu 3 P / B(C 6 F 5)3 ]或膦/亚磷酸盐在可见光辐射下有效地介导了未活化的烯烃和炔烃的官能化。提供了对相应底物范围的全面介绍,以及对两种反应途径的机理细节的见解。
Simple Synthesis of Fluorinated Ene-Ynes via In Situ Generation of Allenes
作者:Ellen M. Sletten、Joseph A. Jaye
DOI:10.1055/s-0037-1610774
日期:2021.11
Fluorination of small molecules is a key route toward modulating reactivity and bioactivity. The 1,3 ene-yne functionality is an important synthon towards complex products, as well as a common functionality in biologically active molecules. Here, we present a new synthetic route towards fluorinated ene-ynes from simple starting materials. We employ gas chromatography-mass spectrometry analysis to probe
The palladium-catalyzed Kharasch reaction of alkenes and alkynes is enhanced by the use of a heterogeneous aqueous system, without the use of hydrophilic co-solvents or phase transfer catalysts. The Pd(0)-catalyzed reaction of terminal alkenes with bromotrichloromethane in water goes to completion within 2 h at room temperature, whereas no reaction occurs in benzene otherwise under the same conditions. The Pd(0) catalyst in aqueous me la a so effects the radical addition of iodoperfluoroalkanes toward terminal alkenes and alkynes at room temperature.