Water → 5-Bromo-2-methyl-2,3-dihydro-1-benzofuran

참여 물질

반응 단계

A solution of 215 ml of bromine in 450 ml of methylene chloride is added dropwise over 21/2 hours to an ice-cooled mixture of 562.3 g of 2,3-dihydro-2-methylbenzo[b]furan, 1600 ml of methylene chloride, 1600 ml of water and 352.5 g of sodium bicarbonate. After the mixture has been stirred for another 11/2 hours at the same temperature, the aqueous phase is separated and extracted with two 300 ml portions of methylene chloride. The combined organic phases are washed with 2×250 ml of water, dried over sodium sulfate and concentrated. After removal of all constituents having a boiling point below 99° C. under a pressure of 8 mbar, there are obtained 750.7 g of 5-bromo-2,3-dihydro-2-methylbenzo[b]furan as residue.

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