CHEM266 Lecture Notes - Diazomethane, Hydrolysis, Orbiting Solar Observatory
12 Dec 2012
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Document Summary
In the absence of a catalyst, hydrogenations of alkenes, although exothermic, do not spontaneously occur, even at high temperatures. In the presence of a catalyst, the same hydrogenations proceed at a steady rate, even at room temperature. The most frequently used catalysts for hydrogenation reactions are: H2 , pto2 , etoh, syn addition (same side) The primary function of a catalyst in hydrogenation reactions is to provide metal-bound hydrogen atoms on the catalyst surface. Common solvents used for hydrogenations include methanol, ethanol, acetic acid, and ethyl acetate. The alkene is a very weak base so you need a very strong acid to get a reaction. Hydrogen becomes attached to the carbon atom of the double bond with the greater number of hydrogens or. I cl hydration water present dilute h2 so4. H2 o - weak base poor nucleophile but better than hso4 also in greater concentration. What is the product of the following reactions.
