Original application December 28, 1944, Serial No. The authors declare no conflict of interest. Consistent with this hypothesis, catalytic hydrogenation of 4-methoxyacetophenone ( Table 2 , entry 3) and dehydrogenation of 1-phenylethanol (in toluene at 120 °C) were quantitative when 1 mol% 3 was … Dehydrogenation reactions were carried out with 0.03 mol% (5) or 0.1 mol% (6) catalyst; however, both used 1.5 mmol alcohol, 3 mmol oxidant, and 3 mmol sodium phenolate as the base at room temperature in o-DCB (reaction volume ∼ 5 mL). revealed 1n Example 3 below which shows that which clearly shows the longevity of the for a given conversion of alcohol to ketone the ZnO Bi2O3 catalyst B1203 fortified catalyst permits a. lower operating temperature. Propargyl alcohol decomposes and deactivates the ruthenium catalyst. and-reducing the fused mixture. Dehydrogenation of 1-butanol to butyraldehyde was the main reaction, with 91% selectivity. Soc. Different mechanisms are examined and clear advantages associated with a bifunctional pathway are outlined. Image credit: Stephanie Gamez (University of California San Diego, La Jolla, CA). Data from Table 4 support our expectations that [FeCp*2] was not strong enough to activate either 5 or 6 for catalytic aldehyde hydrogenation. https://doi.org/10.1016/j.materresbull.2015.07.027. The improvement obtained by using less than 1% of bismuth oxide is perceptible, but not suflicient to be of any material consequence, while the improvement engendered by the use of more than 6% of bismuth oxide is not suflicient over that obtained when using about 6% to warrant the additional expenditure. 101A, 175 (1922) that certain diflicultly reducible metal oxides greatly enhance the activity of metallic copper as a catalyst for the dehydrogenation of alcohols at atmospheric pressure, whereby aldehydes or ketones are formed. gauge.] 280,962, filed May 26, 1928. were employed in this type of reaction. When the oxygenated cluster is thermally activated in a hydrogen stream above 300 °C, catalytic activity for the dehydrogenation of primary alcohols to aldehydes and secondary alcohols to ketones develops. The simplest large-scale procedure for reduction of aldehydes and ketones to alcohols is by catalytic hydrogenation: The advantage over most other kinds of reduction is that usually the product can be obtained simply by filtration from the catalyst, then distillation. Based on CV studies of 6 under the same electrochemical conditions, reductants [FeCp*2] and [Cr(η6-C6H6)2] listed in Table 4 are not strong enough to reduce both C = N bonds in 6. 5, The method of producing methyl ethyl ketone which comprises passing secondary butyl alcohol at about 15 pounds per square inch pressure absolute and at a feed rate of about 4-6 v./v./hour over a catalyst composed of a mixture of zinc oxide and 6% by weight B1203 on a catalyst carrier heated to a temperature of 350- 500C. the second group of the periodic table. 0 .E. in. In an extensive investigation 'of catalysts suitable for the reaction in question, it has been found that a pure copper catalyst prepared by the reduction of copper oxide at a moderately low temperature with hydrogen, and such as has found extensive use in the successful. 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Solid-state molybdenum sulfide clusters catalyzed the dehydrogenation of alcohol. The reactor was sealed, flushed with H2 three times, and finally, placed under 80 psig H2 pressure.
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