C–H and C–F Bond Activations at a Rhodium(I) Boryl Complex: Reaction Steps for the Catalytic Borylation of Fluorinated Aromatics
作者:Sabrina I. Kalläne、Michael Teltewskoi、Thomas Braun、Beatrice Braun
DOI:10.1021/om500952x
日期:2015.4.13
Treatment of the rhodium(I) boryl complex [Rh(Bpin)(PEt3)3] (1, pin = pinacolato = O2C2Me4) with pentafluorobenzene, 1,3,5-trifluorobenzene, 1,3-difluorobenzene, or 3,5-difluoropyridine led to C–H activation reactions to give the aryl complexes [Rh(C6F5)(PEt3)3] (4), [Rh(2,4,6-C6F3H2)(PEt3)3] (5), [Rh(2,6-C6F2H3)(PEt3)3] (6), and [Rh4-(3,5-C5NF2H2)}(PEt3)3] (8). For 5, 6, and 8 consecutive reactions
用五氟苯,1,3,5-三氟苯,1,3-二氟苯处理铑(I)硼基络合物[Rh(Bpin)(PEt 3)3 ](1,pin = pinacolato = O 2 C 2 Me 4)或3,5-二氟吡啶导致C–H活化反应,得到芳基配合物[Rh(C 6 F 5)(PEt 3)3 ](4),[Rh(2,4,6-C 6 F 3 H 2)(PEt 3)3 ](5),[Rh(2,6-C 6 F 2 H 3)(PEt3)3 ](6),以及[Rh 4-(3,5-C 5 NF 2 H 2)}(PEt 3)3 ](8)。为5,6,和8与连续反应原位生成HBpin发生,得到的[Rh(H)(PET 3)3 ](7)和硼酸酯。硼基配合物1与六氟苯或全氟甲苯一起提供C–F活化产物[Rh(C 6 F 5)(PEt 3)3 ](4)和[Rh(4-C 6 F 4 CF 3)(PEt 3)3 ](9)。复合物5,6,和9与乙反应2