Here, this is the method :
"D-Fructose (2.16 g) is dissolved in water (4 ml) at room temperature. Boric acid (0.372 g) is then added to the thus prepared Solution, and upon its dissolving calcium carbonate (0.246 g) is added in Small portions. After carbon dioxide evolution has ceased, acetone (99%, p.a. quality; 20 ml) is added to the reaction mixture, whereupon a colorleSS oil Separates at the bottom of the reaction vessel. Two layers are separated using a separatory funnel, and the lower layer (crude boron complex) is treated again with acetone (20 MI). Upon standing at room tem perature for one hour, the mixture is triturated using a glass rod to induce crystallization, and the oil slowly Solidifies. This produces a white crystalline solid. "
I did exactly the same things written here but crystallization never occurs. Any idea ?
Trituration means to grind; I think what they mean is to scratch around on the glass under the oil to provide some nucleation sites? It's not very clear
Of course, grinding is necessary to cause/start the crystallization of the oil, because small glass particles can serve as a seed for the crystal formation process. It is likely that crystallization does not occur because, for example, the temperature in your laboratory is too high! try putting the vessel in a cool place, such as a refrigerator.
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