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note
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See the Supporting Information for the detailed preparation of the starting carbamates.
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Recently new benzo[e]furans functionalized at C4 and C7-positions have been synthesized and developed as blue-light emitting materials: Hwu, J. R.; Chuang, K.-S.; Chuang, S. H.; Tsay, S.-C. Org. Lett. 2005, 7, 1545-1548.
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