198 REDUCTION WITH ALUMINUM ALKOXIDES ered, caution must be exercised in working with it, particularly if it had been allowed to stand for several days. It is essential to test for the presence of peroxides, which form readily in the impure isopropyl alcohol-acetone mixture. 61 ' * The literature records 62 a serious explo-sion during the distillation of a mixture of isopropyl alcohol and acetone (recovered from the reduction of crotonaldehyde) which had aged for a year. Any peroxides that are present can be removed conveniently by using stannous chloride M before drying and distilling the recovered isopropyl alcohol, f EXPERIMENTAL PROCEDURES Aluminum Isopropoxide $ Twenty-seven grams (1 mole) of aluminum wire or foil which has just been cleaned with emery paper and wiped with a clean cloth (if turnings are employed, it may be necessary to clean, amalgamate, and dry them according to the procedure of Wislicenus) "• 65 is placed in a 1-1. round-bottomed flask containing 300 cc. of anhydrous isopropyl alcohol (dis-
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