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Mikhail D Pivovarov

Vladlen Vasilievich Malovik

Valery Y Semeny

Ninel G Feschenko

Jury V Kandul

Ivan K Mazepa

The method for producing trialkylphosphine oxides having the general formula R.sub.3 PO, where R is an alkyl having from 1 to 16 carbon atoms, consists in that red phosphorus reacts with an alkyl iodide in the presence of a catalyst -- iodine or hexaalkyliodophosphoranephosphonium pentaiodide -- while gradually adding alkyl iodide to the reaction mixture, and maintaining the reaction temperature at 180.degree. - 230.degree. C., with subsequent isolation of the end product. The proposed method simplifies the process for preparing trialkylphosphine oxides, increases the yield of the end product to 80- 90 per cent by weight, rules out side reactions of dehydrohalogenation of alkyl iodides, and also shortens the process to 8- 10 hours.

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Kyiv, Ukraine

Mikhail D Pivovarov