Water → 2-Bromo-1-(5-phenyl-2-thienyl)-1-ethanone

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Reaction Steps

a solution of 2-acetyl-5-phenylthiophene (11.7 g, 0.058 mole), described in Examples 1 and 2, in 100 ml of glacial acetic acid is treated dropwise with bromine (9.3 g, 0.058 mole). The mixture is stirred for 1/2 hr, poured into cold water and extracted with chloroform. The extract is washed with water, 5% NaHCO3 and brine, dried (K2CO3) and concentrated to give a yellow solid. The solid is subjected to chromatography on silica gel to give bromomethyl 5-phenyl-2-thienyl ketone (ArCOCHR2Y; Ar is 5-phenyl-2-thienyl, R2 = H and Y = Br); mp 114° C.

Provenance & Evidence