36 These figures include in addition to the organoaluminum compounds, any combinations which can be made from inorganic substituents. 4 In the text, "Die Chemie der metall-organischen Verbindungen" by E. Krause and one of the authors, the term "alphyl" is used to denote the aliphatic radicals, and "alkyl" in a broader sense to include both aliphatic and aromatic groups. Conforming to common usage in this country, the term alkyl as used in the present paper refers only to aliphatic radicals. 106 SUMMARY 1. Organoaluminum compounds have been prepared by the reaction of aluminum metal with a series of alkyl halides. These halides are methyl and ethyl chlorides, bromides and iodides, and n-propyl iodide.2. By diverse methods each of the dialkylaluminum halides and alkylaluminum dihalides corresponding to the above alkyl halides has been obtained in pure form.3. The preparation of phenylaluminum dichloride, dibromide, diiodide and p-tolylaluminum diiodide is described.4. Alkylaluminum alkoxides have been prepared by the reaction of aluminum alkyls with aluminum alkoxides.5. Dialkylaluminum halides have been prepared directly by the reaction of alkyl halides with an aluminum-magnesium alloy.6. A new method for preparing aluminum alkyls involving the reaction of alkylaluminum halides with alkali metals is described. Riverside, III.

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Laboratory data are presented on the catalytic dehydrogenation of ethylbenzene over a chromia-alumina catalyst in the presence of benzene. Reduction of the partial pressure