A3~z-Pregnadiene-3,21-diol-7,20-dione (VII).--A solution of \'Ia (100 mg.) in acetone (20 ml.) was treated with 3 ?i perchloric acid (1 ml.) and allowed to stand a t room temperature for 2 hours. The greenish-yellow fluorescent solution was poured into ice-water, and the precipitate was collected; 63 mg. (80% yield), m.p. 227-232' with previous softening, browning and decomposition; Xmar 320-321 mp (E 23,500) and 389-392 mp (e 2,700). Two crystallizations from acetone-petroleum ether gave 39 mg., m.p. 232-235' with pre-
[CONTRIBUTION FROM
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vious softening, browning and decomposition; Amax 320321 mp ( E 23,600) and 391-392 mp (. 3,800), hkzxI
