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Q: OH OH
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Q: 2. Provide the reagent(s) necessary to complete the following reactions. a. CH3 b. CH3 CH + ortho Br…
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Question 9
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- Elimination of HBr from 2-bromonorbornane gives only 2-norbornene and no 1-norbornene. How do you account for the regioselectivity of this dehydrohalogenation? In answering this question, you will find it helpful to look at molecular models of both 1-norbornene and 2-norbornene and analyze the strain in each.Following is a retrosynthetic scheme for the synthesis of the tricyclic diene on the left. Show how to accomplish this synthesis from 2-bromopropane, cyclopentadiene, and 2-cyclohexenone.Following are diastereomers (A) and (B) of 3-bromo-3,4-dimethylhexane. On treatment with sodium ethoxide in ethanol, each gives 3,4-dimethyl-3-hexene as the major product. One diastereomer gives the E alkene, and the other gives the Z alkene. Which diastereomer gives which alkene? Account for the stereoselectivity of each -elimination.
- 5. 2. When 2,2-dimethyl-1-propanol is heated with acid, it is slowly converted into an 85:15 mixture of 2 alkenes of molecular formula C2H10.a) Give the mechanisms by which they are formed. b) Give the structures of these alkenes. c) Identify with reason which would be the major productPredict the product from reaction of 1-hexyne with the following reagents: a)NaNH2 in NH3, then CH3Br b) BH3 in THF, then H2O2OH-1. What effect would you expect on the rate of reaction of ethanol with 2-iodo-2-methyl-butane if the concentration of the halide is tripled? 2. Explain the difference between addition, elimination and substitutionreactions. 3. Optically active 2-butanol slowly racemizes on standing in dilute sulfuricacid. Propose a mechanism to account for this observation.
- Triethyloxonium tetrafluoroborate, (CH3CH2)3O+ BF4 −, is a solid with melting point 91–92 °C. Show how this reagent can transfer an ethyl group to a nucleophile (Nuc:−) in an SN2 reaction. What is the leaving group? Why might this reagent be preferred to using an ethyl halide?show how you could prepare 5-methyl-6-bromo-1-hexene. You may use any organic or inorganic reagents necessary, but no more than three carbon atoms from any starting precursor may end up in the final productA reaction of 6 6-diphenylfulvene and Maleic anyhydride gives a product which is white in color. i) Give the name of the formed product and provide the mechanism of this reaction. ii) explain why the produced product of the reaction is white but one of the reactants is deep red.
- a) Give the appropriate base for the above reaction and draw the resonance structures of the enolate ions derived from compound A. Then write the mechanism for the formation of the Dieckmann cyclized product B. b) If compound B above is reacted with NaBH 4 , draw the structure of the reduced product. Give a reason for your choice of product. c) Being a β-ketoester, B could undergo a 3-step synthesis involving alkylation, hydrolysis and decarboxylation reactions to yield the cyclopentanone, C. Write the outline synthesis for each step which include the appropriate regents and correct intermediate.Reaction of HBr with 2-methylpropene yields 2-bromopropane. What is the structure of the carbocation intermediate formed during the reaction? Show the mechanism of the reaction.I need help to find the mechansim for Preparation of Cyclohexanone by CrO3/H2SO4-acetone and explain the mechanisms step by step so I can understand it please