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961). references quoted therein. (2) L. Vaska, J . A m . Chem. Soc., 83, 756 (1962). (3) Water was required to dissolve KzIrCla. and unpublished data. Bachman and R. S. Coffey, Tetrahedron, 18, 617 (1962).(7) Prepared by the method of P. Yates and B. L. Shapiro, J . Org. Chcm., O S , 769 (1958). The authors wish t o thunk Dr. Edwin A.Chandross of these laboratories for a generous supply of azibenzil.(8) Obtained from the Hooker Chemical Company.

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