Nucleophilic substitution reactions of the tricyclic triphosphorus cage P3(CBu(t))2: a novel route to polyphosphorus phosphenium complexes |
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Authors: | Willans Charlotte E Fish Cheryl Green Michael Kilby Richard J Lynam Jason M Russell Christopher A Whitwood Adrian C |
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Institution: | Department of Chemistry, University of York, Heslington, York, UK. |
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Abstract: | Substitution of Cl(-) in the tricyclic triphosphorus cage Cl(P(1))-P3(CBu(t))2 by a range of both anionic and neutral nucleophiles has been investigated. With anionic nucleophiles, reaction with fluoride and hydride anion was shown to afford F(P(1))-P3(CBu(t)) and H(P(1))-P3(CBu(t))2 respectively. Subsequent deprotonation of the latter results in the formation of the aromatic anion 1,2,4-P3(CBu(t))2]-. With neutral nucleophiles, addition of either PMe3 or PEt3 to Cl(P(1))-P3(CBu(t))2 in the presence of TlOTf results in the formation of the phosphine-phosphenium complexes (R3P(P(1))-P3(CBu(t))2]OTf] (R = Me or Et): the structure of the methyl-substituted compound was determined by a single crystal X-ray diffraction study. The phosphine ligand in these complexes is extremely labile and addition of I2 to (Me3P(P(1))-P3(CBu(t))2]+ results in the formation of I(P(1))-P3(CBu(t))2. |
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