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Alkali Metal Species in the Reversible Activation of H2
Maotong Xu1, Andrew R Jupp1, Zheng-Wang Qu2
1Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S3H6, Canada.
Abstract:
MP(tBu)2 (M=Li, Na, K), KH and KN(SiMe3 )2 are shown to activate HD reversibly. In the case of MP(tBu)2 this leads to isotopic scrambling and the formation of H2 , D2 , H(D)P(tBu)2 and MH(D) in C6 D6 . In toluene, KP(tBu)2 reacts with H2 but also leads to isotopic scrambling into the methyl groups of the solvent toluene. DFT calculations reveal that these systems effect H2 activation via cooperative interactions with the Lewis acidic alkali metal and the basic phosphorus, carbanion, or hydride centres, mimicking frustrated Lewis pair (FLP) behaviour.
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