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From the procedure 1. Dissolve the crude material in a minimum amount of hot acetone in a small Erlenmeyer flask. 2. Begin by adding cold acetone (about 1215mt ) and then gently warming on a hot plate until the crude product dissolves. If the solid has not completely dissolved at the boiling point of acetone, take it off the hot plate and add more acetone, in 2mL. aliquots, then re-heat, until a clear, pale-yellow solution is obtained. It may be required to add up to 20mL or s0 to achieve this. 3. Remove the acetone solution from the hot plate and allow to cool slightly. 4. Begin adding petroleum ether, one drop at a time, starting with the full amount of a plastic disposable pipet. Keep adding one drop at a time, with swirling after each addition, until the first appearance of a pervasive cloudiness throughout the solution 5. Recover the recrystallized product by vacuum filtration using a Hirsch funnel. Pull some air through the Hirsch funnel for several minutes after separation to help dry the solid. 6. Transfer the product to a much larger piece of filter paper and allow it to air dry for 20 minutes. PREVIOUS ENTRY NEXT