brown within 5 min. After addition of 0.1 g. of fused potassium acetate, heating was continued with good stirring for 2 hr. The mixture was stirred at room temperature for an additional 12 hr. and poured into 250 ml. of anhydrous ether. The orange-yellow material (3.0 g.) which separated, was purified by solution in hot dimethylformamide and filtration of the solution into hot benzene. After cooling, addition of ether gave 1.3 g. of product, m.p. above 300°. The ultraviolet spectrum showed Xmax 270 µ (e 11,300) in dimethylformamide.
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