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Published on: February 15, 2016
Facile Cleavage of the P=P Double Bond in Vinyl-Substituted Diphosphenes
Liu Leo Liu1, Levy L Cao1, Jiliang Zhou1
1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S3H6, Canada.
Abstract:
The reactions of the cyclic alkyl amino carbene (CAAC) 1 with phosphaalkynes generate the kinetically unstable CAAC-derived phosphirenes 4 and 5, which undergo rearrangement/dimerization reactions to give the vinyl-substituted diphosphenes 2, 3, and 6. The P=P double bond scission of 2 or 3 is unprecedentedly effected by S8 , [AuCl(tht)], or MeOTf at room temperature, which affords a dithiophosphorane 7, a phosphepine Au complex 8, or phosphepinium cations 9 and 10, respectively. The cationic species feature little homoaromaticity while representing the first examples of the phosphorus-containing analogue of the tropylium ion.
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