anhydrous magnesium perchlorate; silice (Merck Kieselgel Art.:7734) multistep reaction; 1.) grafting on a silica, reflux, in toluene, 12 h, 2.) quaternerisation, reflux, toluene, 5 days, 3.) acetonitrile, 65 deg C, 5 days; reagent quantity, reaction time varied; Product distribution;