New Strategies to Phosphino–Phosphonium Cations and Zwitterions
- 14 January 2010
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 16 (3) , 988-993
- https://doi.org/10.1002/chem.200902369
Abstract
By employing strategies based on frustrated Lewis pair chemistry, new routes to phosphino‐phosphonium cations and zwitterions have been developed. B(C6F5)3 is shown to react with H2 and P2tBu4 to effect heterolytic hydrogen activation yielding the phosphino‐phosphonium borate salt [(tBu2P)PHtBu2] [HB(C6F5)3] (1). Alternatively, alkenylphosphino‐phosphonium borate zwitterions are accessible by reaction of B(C6F5)3 and PhCCH with P2Ph4, P4Cy4, or P5Ph5 affording the species [(Ph2P)P(Ph)2C(Ph)C(H)B(C6F5)3] (2), [(P3Cy3)P(Cy)C(Ph)C(H)B(C6F5)3] (3), and [(P4Ph4)P(Ph)C(Ph)C(H)B(C6F5)3] (4). A related phosphino‐phosphonium borate species—[(Ph4P4)P(Ph)C6F4B(F)(C6F5)2] (5) is also isolated from the thermolysis of B(C6F5)3 and P5Ph5.Keywords
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