|
Phosphenium
Phosphenium ions, not to be confused with phosphonium or Phosphirenium ion, phosphirenium, are divalent cations of phosphorus of the form [PR2]+. Phosphenium ions have long been proposed as reaction intermediates. Synthesis Legacy methods The first cyclic phosphenium compounds were reported in 1972 by Suzanne Fleming and coworkers. Acyclic phosphenium compounds were synthesized by Fleming's thesis advisor Robert W. Parry, Robert Parry in 1976. Methods Several methods exist for the preparation of two-coordinate phosphorus ions. A common method involves halide abstraction from halophosphines: :R2PCl + AlCl3 → [R2P+][] Protonolysis of tris(dimethylamino)phosphine affords the phosphenium salt: :P(NMe2)3 + 2 HOTf → [P(NMe2)2]OTf + [HNMe2]OTf Weakly coordinating anions are desirable. Triflic acid is often used. N-heterocyclic phosphenium (NHP) have also been reported. Reaction of PI3 with the α-diimine yields the NHP cation by Redox, reduction of the diimine a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphenium Coordination To Mo Complexes
Phosphenium ions, not to be confused with phosphonium or Phosphirenium ion, phosphirenium, are divalent cations of phosphorus of the form [PR2]+. Phosphenium ions have long been proposed as reaction intermediates. Synthesis Legacy methods The first cyclic phosphenium compounds were reported in 1972 by Suzanne Fleming and coworkers. Acyclic phosphenium compounds were synthesized by Fleming's thesis advisor Robert W. Parry, Robert Parry in 1976. Methods Several methods exist for the preparation of two-coordinate phosphorus ions. A common method involves halide abstraction from halophosphines: :R2PCl + AlCl3 → [R2P+][] Protonolysis of tris(dimethylamino)phosphine affords the phosphenium salt: :P(NMe2)3 + 2 HOTf → [P(NMe2)2]OTf + [HNMe2]OTf Weakly coordinating anions are desirable. Triflic acid is often used. N-heterocyclic phosphenium (NHP) have also been reported. Reaction of PI3 with the α-diimine yields the NHP cation by Redox, reduction of the diimine a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
