3655a. WENDER, I., METLIN, S., AND ORCHIN, M. Chemistry of the Oxo and Related Reactions. V. Acid Catalysis with Pinacol. Jour. Am. Chem. Soc., vol. 73, 1951, pp. 5704-5706.
Reaction of pinacol with CO and H2 at 185° in the presence of a Co catalyst gives a complex mixture of products. 4 compounds more volatile than the starting material were idetnified; these were pinacolone, pinacolyl alcohol, 3,4-dimethylpentanol-1 and 2,2,3-trimethyltetrahydrofuran. The origin of these compounds is consistent with the formation and further reaction of a common carbonium-ion intermediate formed from pinacol under acidic conditions. The acid catalyst is probably Co hydrocarbonyl, HCo(CO)4.