反应详情

In an analogous manner to that described in the first paragraph of Example 6, from 6-bromo-2,2-dimethyl-4-(2-pyridyl)-2H-1-benzopyran there was obtained 2-(6-bromo-2,2-dimethyl-2H-1-benzopyran-4-yl)pyridine N-oxide of melting point 146°-148° C. (from ethyl acetate).