Solvent-free mechanochemical synthesis of phosphonium salts.
Phosphonium salts have been prepared during high-energy ball-milling of triphenylphosphine with solid organic bromides; the reactions occur at ambient conditions without a solvent; in the case of 2-bromo-2-phenylacetophenone the reaction in a solution usually produces a mixture containing both the C-phosphorylated and O-phosphorylated compounds, while the solvent-free mechanically induced transformation results in the thermodynamically favorable C-phosphorylated product; the occurrence of the observed transformations during mechanical processing of solid reactants is confirmed by the solid-state 31P NMR spectroscopy and X-ray powder diffraction.
Balema
Viktor P
VP
Ames Laboratory, Iowa State University, Ames, IA 50011-3020, USA. balema@ameslab.gov
Wiench
Jerzy W
JW
Pruski
Marek
M
Pecharsky
Vitalij K
VK
D002626:Chemistry, Pharmaceutical / Q000379:methods; D007220:Industrial Waste / Q000517:prevention & control; D019563:Mechanics; D009943:Organophosphorus Compounds / Q000138:chemical synthesis*
D007220:Industrial Waste; D009943:Organophosphorus Compounds