Add time:08/29/2019         Source:sciencedirect.com

5-, 6-, 7-, and 8-Chloro-2,2-dimethylchromins have been prepared from the corresponding chloro-coumarin and their conversion into the 3,4-dihalogenochroman derivatives is described. The 4-halogen atom is shown to be the more susceptible to hydrolysis by conversion of the resulting halohydrins into chromanones and epoxides. The formation of bis-chromens during the dehalogenation of 3-halogenochromanones is reported.

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