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- In light of your answer to Problem 30-40, explain why a mixture of products occurs in the following reaction:Qa 18. Bromination of 5a-cholestan-3-one occurs at C-2 or C-4 to give 2 regioisomers. Two unsaturated ketones with lambdamax = 230 nm and lambdamax = 241 nm are yielded during dehydrobromination. Use Woodward-Fieser rules to distinguish between the two.Show the complete mechanism of the acidification of disodium adipate and calculate pKeq for both protonation steps. Note: pKa1 = 4.0, pKa2 = 4.4 for adipic acid. A mechanism must show all nbe’s and show movement of e’s with curved arrows.
- 5. Predict the product and show the mechanism of the following reaction:(Write out complete equations showing the structure of all reactants and products.) 2-methoxyheptane + Excess conc HBr/heat ----->Predict the product, draw the mechanism, and plot the reaction coordinate diagram for theE1 reaction.Predict the reaction of methyl 3-oxocyclohexane-1-carboxylate with NaBH4/ h20 show the mechanism
- E. J. Coreys 1964 total synthesis of -caryophyllene (essence of cloves) solves a number of problems of construction of unusual-sized rings. The first step uses an efficient photochemical [2 + 2] reaction. The desired stereochemistry and regiochemistry had been predicted based on model reactions. (a) [2 + 2] Reactions are quite common in photochemical reactions. Would this reaction be predicted to occur in the ground state? The next steps follow. Basic alumina is a chromatography support that will often act as a base catalyst. (b) What is the mechanism of the first step? (c) What is the mechanism of the second step? (d) Look at later steps in the synthesis. Does the stereochemistry of the added carbomethoxy group matter? The next steps are shown here. (e) What is the structure of compound (A)? (f) Give a mechanism for the formation of the cyclized product. (g) Give a mechanism for the first step. Hint: Attack on the lactone carbonyl may be the first step. (h) Give a structure for product (B). The following two steps are next. (i) Show the reactions of (B). (j) Write a mechanism for the ring-opening reaction. Hint: Note the presence of an acidic proton and a good leaving group in the molecule. The synthesis was completed by the following steps. (k) What is (C)? (l) What reagents would you use for these transformations?Isoleucine, another of the twenty amino acids found in proteins, is metabolized by a pathway that includes the following step. Propose a mechanism.Please show me the mechanism for O3+2-methyl-2-butene, stoping at the ozonide?
- the bromination of trans-stilbene produces a vicinal dihalide, 1,2-dibromide-1,2-diphenylethane. how do you know what a product's configuration (RR/SS, RS/SR, or pure RR or SS) is based on the mechanism of reaction?Consider the series of the trans effect: CO, CN-, C2H4 > PR3, H-, CH3- > C6H5- > NO2-, SCN-, I- > Br- >Cl- > py > NH3 > H20 What would be the major product of the following reaction? Select one:Predict the products of the following reaction. Co(s) + xsF2(g)---->
