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     While they were stirred vigorously under a stream of nitrogen, half of a solution of 25.6g of ammonium chloride in 100 ml of water was added, all at once, through a dropping funnel thereinto. The internal temperature rose suddenly to 70 to 80¡æ£¬and mild heating-up and reflux took place. After the reflux subsided a little, the rest of the solution was added, again all at once, followed by stirring.
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