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Dimethylphosphine oxide is an organophosphorus compound with the formula (CH₃)₂P(O)H. It is a colorless liquid that soluble in polar organic solvents. It exists as the phosphine oxide, not the hydroxy tautomer. A related compound is diphenylphosphine oxide. Both are sometimes called secondary phosphine oxides.

Preparation

The compound arises by the hydrolysis of

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