Phosphinodefluorination of polyfluorobenzenes by silylphosphines Ph(R)PSiMe3 (R=Me, Ph): Further experimental and computational evidences for the concerted ANDN mechanism of aromatic nucleophilic substitution
作者:S.I. Zhivetyeva、L.I. Goryunov、I.Yu. Bagryanskaya、J. Grobe、V.D. Shteingarts、E.-U. Würthwein
DOI:10.1016/j.jfluchem.2014.04.012
日期:2014.8
of the single substrates and in competitive reactions of 3 vs. 4 with 1 or 2 and 4 vs. 5 with 2 indicate relative fluorine substituent rate factors fo-F > fm-F consistent with the concerted ANDN mechanism which is supported by high level quantum chemical DFT-studies for the reactions of the substrates 3 and 4 with 1, 2 and 10 as well as for 6 with 2.
Trimethylsilylphosphines PhRPSiMe 3(1,R = Me中,2 R = PH)已经显示出phosphinodefluorinate 1,2,3-(3),1,3,5-(4)和1,2,4-三氟苯(5)在苯溶液中或无溶剂在150-200℃,以形成相应的(二氟苯基)甲基苯基和相比我的先前报道的反应更难的条件下高收率NMR -diphenylphosphines 2 PSiMe 3具有相同的底物。六氟苯(6),五氟苯(7)(在150℃),八氟甲苯(8)和五氟(9)(在20℃)与膦反应2没有溶剂几乎定量下氟1,4-二取代(对于6)或单取代(对于7-9)通过将pH 2 P组,得到相应的(polyfluoroaryl)diphenylphosphines在(为50-60%6-8)和95%(对于9)分离产率。通过表现出的区域选择性和底物选择性3-5在单个基片的反应和中的竞争反