C−H and C−F Bond Activation Reactions of Fluorinated Propenes at Rhodium: Distinctive Reactivity of the Refrigerant HFO‐1234yf
作者:Maria Talavera、Cortney N. von Hahmann、Robert Müller、Mike Ahrens、Martin Kaupp、Thomas Braun
DOI:10.1002/anie.201902872
日期:2019.7.29
The reaction of [Rh(H)(PEt3)3] (1) with the refrigerant HFO‐1234yf (2,3,3,3‐tetrafluoropropene) affords an efficient route to obtain [Rh(F)(PEt3)3] (3) by C−F bond activation. Catalytic hydrodefluorinations were achieved in the presence of the silane HSiPh3. In the presence of a fluorosilane, 3 provides a C−H bond activation followed by a 1,2‐fluorine shift to produce [Rh(E)‐C(CF3)=CHF}(PEt3)3] (4)
[Rh(H)(PEt 3)3 ](1)与制冷剂HFO-1234yf(2,3,3,3-四氟丙烯)的反应提供了获得[Rh(F)(PEt 3)3的有效途径](3)通过CF键活化。在硅烷HSiPh 3的存在下实现了催化加氢氟化。在存在氟硅烷的情况下,3会提供CH键的活化,然后发生1,2-氟转移,从而产生[Rh (E)-C(CF 3)= CHF}(PEt 3)3 ](4) 。在[Rh(E)(PEt 3)观察到了类似的HFO-1234yf重排。3 ] [E = Bpin(6),C 7 D 7(8),Me(9)]。3,3,3-三氟丙烯也证明了使用3和氟硅烷促进CH键活化的能力。DFT计算支持研究。