Volume 58, Issue 31 pp. 10688-10692
Communication

C−H and C−F Bond Activation Reactions of Fluorinated Propenes at Rhodium: Distinctive Reactivity of the Refrigerant HFO-1234yf

Dr. Maria Talavera

Dr. Maria Talavera

Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany

These authors contributed equally to this work.

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Cortney N. von Hahmann

Cortney N. von Hahmann

Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany

These authors contributed equally to this work.

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Dr. Robert Müller

Dr. Robert Müller

Institut für Chemie, Theoretische Chemie/Quantenchemie, Sekr. C7, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany

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Dr. Mike Ahrens

Dr. Mike Ahrens

Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany

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Prof. Dr. Martin Kaupp

Corresponding Author

Prof. Dr. Martin Kaupp

Institut für Chemie, Theoretische Chemie/Quantenchemie, Sekr. C7, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany

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Prof. Dr. Thomas Braun

Corresponding Author

Prof. Dr. Thomas Braun

Department of Chemistry, Humboldt Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany

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First published: 18 May 2019
Citations: 28

Dedicated to Professor Helmut Werner on the occasion of his 85th birthday

Graphical Abstract

Cool down: Using the refrigerant HFO-1234yf together with [RhH(PEt3)3], a C−F bond activation occurs to produce a rhodium fluorido complex. This reaction is followed by a C−H bond activation mediated by the fluorosilane and a subsequent 1,2-fluorine shift.

Abstract

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). Similar rearrangements of HFO-1234yf were observed at [Rh(E)(PEt3)3] [E=Bpin (6), C7D7 (8), Me (9)]. The ability to favor C−H bond activation using 3 and fluorosilane is also demonstrated with 3,3,3-trifluoropropene. Studies are supported by DFT calculations.

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