This report conserns the regioselectivity of bromination on sertain phenylacetic acids. Reaction with different brominationagents were made on a row of different phenylacetic acid-derivatives. Isomerizationreaction were made with AlCl3 but the result was shown to not be satisfying to improve the regioselectivity. 2-Tetralons were synthesised and isomerisationreaction were studied also on those.