198REDUCTION WITH ALUMINUM ALKOXIDESered,caution must be exercised in working with it, particularly if it hadbeenallowed to stand for several days. It is essential to test for thepresenceof peroxides, which form readily in the impure isopropylalcohol-acetonemixture.61' * The literature records62a serious explo-sionduring the distillation of a mixture of isopropyl alcohol and acetone(recoveredfrom the reduction of crotonaldehyde) which had aged forayear. Any peroxides that are present can be removed conveniently byusingstannous chlorideMbefore drying and distilling the recoveredisopropylalcohol,fEXPERIMENTALPROCEDURESAluminumIsopropoxide $Twenty-sevengrams (1 mole) of aluminum wire or foil which has justbeencleaned with emery paper and wiped with a clean cloth (if turningsareemployed, it may be necessary to clean, amalgamate, and dry themaccordingto the procedure of Wislicenus) "•65is placed in a 1-1. round-bottomedflask containing 300 cc. of anhydrous isopropyl alcohol (dis-
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