boron trifluoride diethyl etherate in acetonitrile T=20°C; 24 h;

1: 90 percent / 45percent HBr / CHCl3; acetic acid / 3 h / 25 °C 2: Bu4NBr, ethyldiisopropylamine / CH2Cl2 / 48 h / 55 °C / molecular sieve 4A 3: 98 percent / 0.025M NaOCH3 / 25 °C View Scheme

acetyl chloride in methanol; benzene 24 h; Heating;