2) Write the products of the following reactions and indicate if they are meso compounds or racemic mixtures. + KMNO4, KOH, cold Ph Ph Ph H, 1 atm. RT Ni (cat) Ph
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- The formation of Br2 from NBS first involves the reaction of NBS with HBr to form an iminol intermediate and molecular bromine. The intermediate then undergoes acid-catalyzed tautomerism to form succinimide, the byproduct of the reaction. Propose a curved-arrow mechanism for the conversion of NBS into succinimide that also accounts for the formation of Br2.Suppose we aempt the conversion of fumaric acid to deuterated malic acid with BD3·THF,followed by oxidation with D2O2in NaOD(aq). Show all the possible stereoisomers (as Fisherprojections) that may be formed, and draw the mechanistic pathways (showing stereochemistry)that lead to these possible productsAccount for the rapid rate of methanolysis of ClCH2OCH2CH3 even though the substrate is a primary halide. Hint: The reaction of the substrate with ethanol proceeds by SN1 mechanism. Draw the Lewisstructures.
- What is the the stereochemistry of the two chiral centres in the product O? R or S? Is the hydride delivered from the re or the si face of the ketone in N?Compound W shows stereoisomerism. Why are such isomers formed in approximately equimolar quantities no matter the synthetic pathway used for the preparation of the compound?Draw the products of the addition of -OH to the si face of crotonate at C3, followed by protonation at C2, also from the si face
- Fill in the blanks in the following reactions. Include stereochemistry when relevant.The compound 3,4-dimethyl-hexan-3-ol of 3R, 4S configuration is treated with a concentrated HBr solution at room temperature. A mixture of two stereoisomers is obtained.If the reaction mixture above is heated, the appearance of several other compounds is observed. 1) Draw the different compounds obtained using the wedge-flywheel representation. 2) What is the majority product? Explain 3) Propose a modification of the experimental conditions in order to obtain the exclusive formation of these compounds obtained after heatingplease provide the machanisms of 1a, 1e, 1f
- Question #16a. Please provide the missing reactants, reagents, or products for the following reaction sequences below. If a sequence leads to a race mic mixture you should indicate +enantiomer.Give explanation for the following fact:- The enzyme alcohol dehydrogenase catalyzes the oxidation of CH3CH2OH to CH3CHO. But when racemic CH3CHDOH is similarly oxidized, an optically active enantiomer remains.The rate constant for the uncatalyzed reaction of two molecules of glycine ethyl ester to form glycylglycine ethyl ester is 0.6 M- 1s - 1. In the presence of Co2 +, the rate constant is 1.5 * 106 M- 1s - 1. What rate enhancement does the catalyst provide?