Bromine → 1,1,3,4,4,6-Hexamethyl-7-bromacetyl-1,2,3,4-tetrahydronaphthalene

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A solution of 1,1,3,4,4,6-Hexamethyl-7-acetyl-1,2,3,4-tetrahydronaphthalene(33 g.) in 40 ml. glacial acetic acid was treated slowly with 20 g. bromine. Warming was necessary to initiate the reaction, evidenced by disappearance of the red colouration. When all the bromine had been added,the mixture was cooled and poured onto ice to give a pale green gum. The whole was extracted with ether, the ethereal extracts washed with dilute Na2CO3, water and finally dried over MgSO4. Evaporation ofthe ether gave a pale green solid which was recrystallised from EtOH to give the title compound 27.6 g. (64%), m.p. 68° C. Analysis : Calculated for C18H25OBr, C, 64.09%; H, 7.47%. Found : C, 64.40%; H, 7.65%.

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