Method B.-The methoxyphenanthrol (IIIa, IIIb or IIIc, 500 mg.) and 48y0 hydrobromic acid (3 ml.) were warmed to about 100'and acetic anhydride (50 drops) added cautiously. Sufficient acetic acid was added to produce a homogeneous solution and the mixture heated at 110'for 2 hours. Excess hydrobromic and acetic acids
