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ROWS2210new - 2210 Reactions of the Week For each week...

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2210 Reactions of the Week For each week listed below you are expected to study and know the information contained in the indicated reaction of the week. Following the week in which we discuss a particular reaction, you will be expected to be able to complete an equation of the type discussed by listing the product(s) of the reaction when you are provided with the reactants. These reactions may show up on both exams and quizzes for the remainder of the course. Week 2 09/05/2008 Catalytic Hydrogenation Week 3 09/12/2008 Free Radical Halogenation Week 4 09/19/2008 Nucleophilic Substitution Week 5 09/26/2008 Dehydrohalogenation Week 6 10/03/2008 Dehydration of an Alcohol Week 7 10/10/2008 Oxidation of an Alcohol Week 8 10/17/2008 Reduction of a Ketone or Aldehyde Week 9 10/24/2008 Lithium Dialkylcuprates Week 10 10/31/2008 Alcohols from Alkenes via Oxy….. Week 11 11/07/2008 Addition of HX to an Alkene Week 12 11/14/2008 Addition of a Halogen to an Alkene The Halohydrin Reaction Week 13 11/21/2008 Cold Permanganate Oxidation of Alkenes Ozonolysis of Alkenes and Alkynes Week 14 11/28/2008 Allylic and Benzylic Bromination Week 15 12/05/2008 The Diels-Alder Reaction
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H 2 Pt CH 3 H H 3 C H H H Pt, heat + H 2 This reaction is reversible with heat and NO H 2 Reaction of the Week Catalytic Hydrogenation C C + H H Catalyst C C H H Description of the reaction: Alkenes and alkynes (compounds with carbon-carbon double bonds or triple bonds) react with hydrogen gas (H 2 ) in the presence of a catalyst to produce the corresponding saturated alkane addition product. We describe the process as hydrogenation and say that the double bond has been hydrogenated , or reduced . The reaction is reversible and double bonds may be formed when saturated compounds (containing only single bonds) are reacted with the proper catalyst in the absence of hydrogen* . Reaction Conditions: Platinum and palladium are the most common catalysts for alkene hydrogenation. Nickel is also used. Many complex catalysts are employed in these reactions to avoid unwanted side-reactions. Some examples of conditions for hydrogenation include H 2 , Pt; H 2 , PtO 2 , in acetic acid; and H 2 , Pd/C, in ethanol. Depending upon the reaction, heat and increased pressure may also be used. How to recognize the reaction: Look for the following above or below the reaction arrow or in the list of reactants; H 2 and platinum, palladium, or nickel. Look at the reactants and find a double or triple bond in the compound. Predicting the products: Redraw the original reactant, but put single bonds where there used to be double or triple bonds. * Other reactions these conditions may cause: Because other structures commonly found in organic compounds may also be reduced with H 2 and a simple metal catalyst; specialized, complex catalysts are often used. Other groups that may be reduced include C=O and C N.
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