Abstract
Abstract Titanium trichloride catalyzed very rapidly the oxidation of triphenylphosphine with oxygen in acetonitrile, yielding triphenylphosphine oxide and a yellow precipitate. The main catalytic cycle did not contain Cl3Ti–O–TiCl3 which was produced in the oxidation of TiCl3 alone, but the precursors of Cl3Ti–O–TiCl3 as intermediates. The yellow precipitate was a titanium(IV) complex with a discrete TiO group.
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