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The solubility of 3-bromoacetyl coumarin would depend on the solvent. Generally, coumarins are more soluble in polar solvents like ethanol or acetone due to their ability to form hydrogen bonds. The presence of the bromine atom might slightly increase its solubility in non-polar solvents like diethyl ether due to its electron-withdrawing nature. However, the precise solubility in specific solvents would require experimental determination or molecular modeling.