Abstract
Abstract The title compounds (7 &8) were obtained in excellent yields from 4-[2′-chloroprop-2′-enyloxy] [1] benzopyran-2-one (5) and 3-[2′-chloroprop-2-enyloxy][1]benzopyran-2-one (6) via [3,3] sigmatropic rearrangement and cyclisation of the intermediate chloroallylic enols with conc. H2SO4. The reaction was also studied in N,N-dimethyl aniline.
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