aluminium trichloride; acetyl chloride in dichloromethane Friedel-Crafts acetylation; anhydrous AlCl3-powder in CH2Cl2 is stirred at 0°C under N2, addn. of acetylchloride in CH2Cl2, stirring (30 min), Cr-compd. is added dropwise within 30 min (stirring, 0°C), further stirring (room temp., 5 h); mixt. is poured into ice-water, sepn. of the layers, aq. layer is extd. with CH2Cl2, combined org. layers are washed (with water, aq. NaHCO3), dried (Na2SO4), concd. (vac., 40-50°C), chromy., main fraction (mixt. of Cr-compds.) is not separable;

aluminium trichloride; acetyl chloride in dichloromethane Friedel-Crafts acetylation; anhydrous AlCl3-powder in CH2Cl2 is stirred at 0°C under N2, addn. of acetylchloride in CH2Cl2, stirring (30 min), Cr-compd. is added dropwise within 30 min (stirring, 0°C), further stirring (room temp., 5 h); mixt. is poured into ice-water, sepn. of the layers, aq. layer is extd. with CH2Cl2, combined org. layers are washed (with water, aq. NaHCO3), dried (Na2SO4), concd. (vac., 40-50°C), chromy., main fraction (mixt. of Cr-compds.) is not separable;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '104581', constants.ctx, '0')">2-picoline</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '969209', constants.ctx, '0')">diethylene glycol</a> <br />&nbsp;under N2; a mixt. of Cr-compd. and diphenylmethane in dry diglyme in the presence of 2-methylpyridine is refluxed until the evolution of gas ceases (5.5 h); the cooled soln. is filtered with the aid of Celite, freed of solvent and the residue is chromd. on silica gel, elution with light petroleum -benzene and crystn. from this solvent;&nbsp;<br /> &nbsp;