The stereochemistry at C-16 was not established but in view of the usual behavior of Ala steroids attack at C-16 would be expected to occur from the a side. Formation of dimeric nitroso compounds by lead tetraacetate oxidation of aldoximes has been described previously by Kropf and Larnbeck.'j In the present case we can assume that bonding to C-16 is facilitated by the high reactivity of the Ale double bond of I. Whereas the reactions in dry ...