1. The product contains the phosphonium cation [ HPPh 3 ] +. 2. It is also easily alkylated to give phosphonium derivatives RPMe 3 +. 3. The phosphonium salts have been traditionally used for peptide synthesis. 4. Important chiral cation scaffolds are quaternary ammonium cations and quaternary phosphonium cations. 5. The hydride is lithium aluminium hydride and the leaving group a phosphonium salt. 6. They also are derived from phosphonium salts, but by deprotonation not alkylation. 7. Reduction, iodination, and treatment with triphenylphosphine led to the phosphonium salt. 8. Mechanisms differ for aliphatic and aromatic aldehydes and for aromatic and aliphatic phosphonium ylides. 9. Unlike phosphonium ylides, the dialkylphosphate salt byproduct is easily removed by aqueous extraction. 10. His early work was the study of phosphonium and phosphine derivatives and allied ammonium compounds.
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