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- Provide the E2 mechanism for β-elimination reactionemploying 2-chloro-2-methylbutane to prepare 2-methyl-2-butene and 2-methyl-1-butene reaction. Use the actual structures of thereactants and products. Explain which of the alkenes is the major product ofthis reaction ?In an attempt to prepare propylbenzene, a chemist alkylated benzene with 1-chloropropane and aluminum chloride. However, two isomeric hydrocarbons were obtained in the proportion of 2: 1. What is the main product? How did this come about? Explain showing the mechanism and nomenclature of the reaction compoundsShow how the o-bromopropylbenzene can be synthesized from benzene:
- Describe the mechanism by which benzene is converted to bromobenzene (C6H5Br) on treatment with a mixture of bromine and iron (III) bromide (Br2/FeBr3). Your answer should illustrate how the electrophile (Br*) is formed from the Br₂/FeBr3 and how it is involved in the electrophilic substitution of the aromatic ring.What is the mechanism for the hydraction of cyclohexene by oxymercuration?Show the process of synthesizing 2-methyl2-cyclohexenone from 2-methyl cyclohexanone. Write down the stages of the monocyclic reaction process in detail.
- a) Cycohexanone reacts with 1,3-propanediol under acid catalysis to form the cyclic acetal. Write down the reaction mechanism and explain why the use of cyclic acetals as protecting groups is preferred over open- chain acetals. b) Eugenol (see below) is made from cloves. Give the structural formulas of the products which are formed after reaction of eugenol with i) BH3, then H2O2 / NaOH or after reaction with ii) acetic anhydride. OH EugenolCH3 Ph3P-CHCH3 H3C H3C Aldehydes and ketones are converted into alkenes by means of a direct nucleophilic addition called the Wittig reaction. In the reaction, a triphenylphosphorine ylide, also called a phosphorane, adds to an aldehyde/ketone to give a four-membered cyclic intermediate called an oxaphosphetane. The oxaphosphetane is not isolated but instead spontaneously decomposes to release triphenylphosphine oxide and an alkene. Ph3P-CHCH3 H3C The ylide is formed by reaction of triphenylphosphine, a good nucleophile, with a primary alkyl halide in an S 2 reaction, followed by deprotonation of the carbon with a strong base, such as butyllithium. The carbonyl carbon and the carbon originally bonded to the halogen become the two carbons with the double bond in the product alkene :0: CH3 Com The real value of the Wittig reaction lies in its ability to yield an alkene of predictable structure, as the C-C bond is precisely where the C=O bond was in the reactant and no isomers (other than…How would you accomplish the following conversion of nitrobenzene to benzene?
- Elimination of HBr from 2-bromobutane affords a mixture of 1-butene and 2-butene. With sodium ethoxide as base, 2-butene constitutes 81% of the alkene products, but with potassium tert-butoxide, 2-butene constitutes only 67% of the alkene products. Offer an explanation for this difference.A small amount of 4,6-decadiyne is formed in reactions involving 1-pentyne. At what point in the mechanism does this compound form?Write out the complete mechanism for the reaction between benzene and 1-chloro-2- methylpropane in the presence of aluminum trichloride. You must show all the resonance structures with appropriate arrows to show electron flow.