Q2. Show how each of the following compound can be produced from an alkene or alkyne (dihydroxylation, oxidative cleavage): (a) 1. conc KMnO4, KOH, A 2. HO (b) 1. conc KMnO4, KOH, A (c) ? ? 1.03,-78 °C ? 2. HO 2. Zn, HOAc (d) 1.03, -78 °C 2. H₂O2 ? (e) 1. OsO4 H2O2 2. HIO4 (1) ? HO conc KMnO KOH, A ?
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- Explain why α-pyrone reacts with Br2 to yield a substitution product (likebenzene does), rather than an addition product to one of its C=C bonds.Bromide Bhas normal activity (for a secondary bromide) towards SN1 substitution, but A has much higher reactivity and Chas much lower reactivity.The following SN2 reaction gave J as a major product. Determine the structure of J. Explain your answer.
- In some nucleophilic substitutions under SN1 conditions, complete racemization does not occur and a small excess of one enantiomer is present. For example, treatment of optically pure 1-bromo-1-phenylpropane with water forms 1- phenylpropan-1-ol. (a) Calculate how much of each enantiomer is present using the given optical rotation data. (b) Whichproduct predominates—the product of inversion or the product of retention of conguration? (c) Suggest an explanation for this phenomenon.Could someone help me with ranking these with how reactive they would be with an SN2 reaction? Thanks :)The bicyclic heterocycles quinoline and indole undergo electrophilic aromatic substitution to give the products shown.(a) Explain why electrophilic substitution occurs on the ring without theN atom for quinoline, but occurs on the ring with the N atom in indole. (b)Explain why electrophilic substitution occurs more readily at C8 than C7in quinoline. (c) Explain why electrophilic substitution occurs morereadily at C3 rather than C2 of indole.
- In some nucleophilic substitutions under SN1 conditions, complete racemization does not occur and a small excess of one enantiomer is present. For example, treatment of optically pure 1-bromo-1-phenylpropane with water forms 1-phenylpropan-1-ol. (a) Calculate how much of each enantiomer is present using the given optical rotation data. (b) Which product predominates—the product of inversion or the product of retention of configuration? (c) Suggest an explanation for this phenomenon.Carbocations often rearrange, as shown below. Draw in the hydrogens on the two carbons involved in the rearrangement, and show formal arrow-pushing to illustrate the transformation.In some nucleophilic substitutions under SN1 conditions, complete racemization does not occur and a small excess of one enantiomer ispresent. For example, treatment of optically pure 1-bromo-1phenylpropane with water forms 1-phenylpropan-1-ol. (a) Calculate how much of each enantiomer is present using the given optical rotation data. (b) Which product predominates—the product of inversion or the product of retention of configuration? (c) Suggest an explanation for this phenomenon.