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10 g of N1A(µ×Î were dissolved in 1000 ml of water, then 108 g of aluminium trichloride were added. The mixture was heated up to 85¡ã C. then 2 g of Pd/C 5% 50% wet was added to the mixture. The suspension so obtained was then hydrogenated under pressure (500 psi) under vigorous agitation for 36 hrs at a temperature of 85¡ã C. The catalyst was then recovered by filtration maintaining the temperature above 60¡ã C. Then 50 ml of toluene were added and the mixture treated with NaOH 30% (40 ml) till pH12 and clear solution was obtained. The clear aqueous phase, containing sodium aluminium hydroxides was discharged; the toluene solution was washed two times with small quantity of cold water (3 ml) for the sake of removing the un-reacted starting material. The toluene solution was then concentrated under vacuum till residue, the residue was taken up with acetone 40 ml. Hydrochloric acid was bubbled maintaining the mixture temperature below 15¡ã C. to get precipitation of N2A in highly pure form, which was cooled to 5¡ã C. and then collected obtaining 9.0 g of N2A£¨²úÎ yield: 98.2%-purity 99.9%. |
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