New Strategies to Phosphino–Phosphonium Cations and Zwitterions |
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| Authors: | Stephen?J Geier Meghan?A Dureen Eva?Y Ouyang Douglas?W Stephan Prof?Dr |
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| Institution: | Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, ON, M5S3H6 (Canada) |
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| 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 PhC?CH 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. |
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| Keywords: | alkyne activation hydrogen activation main group elements phosphino‐phosphonium phosphorus zwitterions |
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