Organic 2 Review Problem 384

Organic 2 Review Problem 384 - 368 P RACTICAL ORGANIC...

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368 PRACTICAL ORGANIC CHEMISTRY 3. Osazone formation. The preparation of glucosazone has already been given (p. 137). It may be carried out on a small scale by either of the following methods, according as (a) the phenylhydrazine base, or ( b ) one of its salts, is used. (a) Dissolve i g. of the sugar in 10 ml. of water in a boiling-tube, add 2-5 ml. of phenylhydrazine and 3 ml. of glacial acetic acid. Mix well, cork the tube loosely and place in a beaker of boiling water. Yellow crystals of the osazone appear after 10-15 minutes. Examine some of the crystals under the microscope as described on p. 139, and note the sheaves of fine needles (Fig. 63(A), p. 139). Filter off the remainder, wash well with water, dry and take the m.p. (204°). ( b ) To io ml. of a i% solution of glucose, add about 0-2 g. of phenylhydrazine hydrochloride, about 0-5 g. of sodium acetate and a few drops of glacial acetic acid. Warm gently to dissolve and then filter if necessary through a small fluted filter-paper (to remove im-
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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