Abstract
Abstract The benzoxazine and the benzothiazine moieties of cyclohepta[b][1,4]benzoxazines and their S-analogs were easily exchanged with o-aminobenzenethiol, o-phenylenediamine and other related 1,2-bifunctional reagents in ethanol. The exchange of the two fused heterocycles of a tropylium compound is also described.
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