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to tetramethylmannose and tetramethylglucose. 6. The ring structures of the normal forms of tetramethylmannose and tetramethylglucose are indicated to be identical.7. The prediction of the ene-diol theory as applied to the action of dilute alkali upon tetramethylmannose has been confirmed. Evanston, Illinois

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The manufacture of butadiene from ethanol by the American two-step process developed by Car-bide and Carbon Chemicals Corporation3•4 and operated by that organization and by Koppers Company, Inc., comprised (1) dehydrogenation of ethanol to acetaldehyde followed by (2) catalysis of acetaldehyde-ethanol to produce butadiene. This paper discusses the mechanism of the second step, ih which a mixture of approximately 69 wt. % of ethanol, 24 wt. % of acetaldehyde and 7 wt. % of water was passed over a 2% Ta20s-98% SiOj cata-

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Sulfuric Acid in the Olefins-Benzene Reaction 919 Experiment 2.-The liquid product was separated in the following fractions: (1) 67-82°, 58.0 g.; (2) 152-153°, 10.0 g.; (3) 168-170°, 5.5 g.; (4) bottoms, 4.0 g. Fraction 2 was isopropylbenzene as shown by its analysis for carbon and hydrogen, molecular weight and conversion to benzoic acid by oxidation with permanganate.