REACTIONS AND IDENTIFICATION 397 5. Rupture by hydrogen iodide. Ethers are usually broken up by hot hydrogen iodide thus: C 2 H 5 OC 2 H 6 + 2 HI = 2C 2 H 6 I + H 2 O CH 3 OC 6 H 6 + HI = CH 3 I + C 6 H 5 OH Heat under reflux i g. of anisole and 10 ml. of constant-boiling hydrogen iodide for 30 minutes. Now distil off the volatile methyl iodide and identify it in the distillate (see pp. 390-391). 6. Pier ate formation. Dissolve o-i g. of anisole in io ml. of hot ethanol and add this solution to a solution of 0-25 g. of picric acid in io ml. ethanol. Set aside until separation of the picrate (i :i compound) is complete. Filter off the solid and recrystallise from ethanol: m.p. 8o°. (M.ps., p. 560.) CRYSTALLINE DERIVATIVES FOR IDENTIFICATION. As stated above, ethers do not lend themselves to the ready formation of crystalline derivatives. The following however, are recommended. (A) $,$-Dinitrobenzoates. Only suitable for symmetrical aliphatic ethers. Preparation, see above. The yields are usually very low.
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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.