aluminium chloride in dichloromethane ferrocene (1.0 equiv.) added to a stirred suspension of benzoyl chloride(2.2 equiv.) and aluminium chloride (2.2 equiv.) in dichloromethane, st irred at room temp. overnight (16 h); washed with water, organic layer passed through a plug of alumina, washed with chloroform, washings concentrated in vacuo, crude product purified by flash column chromy. on silica gel (TLC Rf 0.26 (1:1 ether-hexane)), elem. anal.;

1-ethyl-3-methylimidazolium iodide-AlCl3 (argon); very slow addn. of AlCl3 to 1-ethyl-3-methylimidazolium iodide, addn. of ferrocene to the ionic liquid, stirring (10 min), ice bath (0°C), addn. of BzCl, stirring (0°C, 2 h), quenching (2 M HCl); extraction (CH2Cl2), drying (MgSO4), concn. (vac.), column chromy. (SiO2, hexanes/ethyl acetate, 10:1 to 1:1);

aluminium trichloride in carbon disulfide

in tetrahydrofuran heated at reflux under nitrogen for 3 days; filtered; concentrated with rotary evaporator; dried under a high vac.; crystd. from ethanol/water;