(6) J. Michalski and A. Skowronska, submitted for publication.(7) M. Mikolajczyk and J. Luczak, Chem. lnd.(London), 701 (1974).(8) NJ De'ath. K. Ellies. D. JH Smith. and S. Trlppett, Chem. Commun.,(9) it has been demonstrated that optically active phosphine oxide readily racemizes in the presence of dinitrogen tetroxide. 4a (10) To minimize the content of water in the reaction medium we used 80-90% hydrogen peroxide as the oxidizing agent.( ...