Bromo Bromophenacyl esters

Adding an alcoholic solution of phenacyl or 4-bromophenacyl bromide to[a solution of a carboxylic acid that has been neutralized with sodium carbonate gives an ester of a)-hydroxyaceto-phenone or of its 4-bromo derivative these esters crystallize well from ethanol and are useful for characterization of liquid acids. 

Comparable phenacyl esters are synthesized with p-bromophenacyl bromide or p-nitrophenacyl bromide with a similar spectroscopic behavior (both p-Bondapak C18). Useful derivatization by tagging the COOH group can also be done with a-bromo-2 -acetonaphthone resulting in well-soluble and strongly UV-absorbing (254 nm) naphthanyl esters after a reaction time of only 10 min at ambient temperature (LiChrosorb Si-100). Furthermore, coumarin derivatives (substituted at position 7 for higher fluorescence quantum yields) are predestinated to... 

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