11.11 Ethers can often be prepared by SN2 reaction of alkoxide ions, RO", with alkyl halides. Which of the two possible routes would be the better choice to synthesize the molecule shown below? Explain briefly. (a) (b) or + CH31 + CH3O™
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Ethers can often be prepared by SN2 reaction of alkoxide ions, RO*, with
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- An aromatic compound ‘A’ on treatment with aqueous ammonia and heating forms compound ‘B’ which on heating with Br2 and KOH forms a compound ‘C’ of molecular formula C6H7N. Write the structures and IUPAC names of compounds A, B and C.Below are two potential methods for preparing the same ether (Option A and B), but only one of them is actually successful. Identify the successful approach (A or B)Most alkyl bromide are water-insoluble liquids. But when the following alkyl bromide Awas first isolated, its high melting point of 203oC (solid at room temperature) and its water solubility led its discoverers to comment that it behaves more like a salt (hint: like NaCl). Explain the salt-like behavior of compound A in under thirty words.
- Give reasons: (a) n-Butyl bromide has higher boiling point than f-butyl bromide. (b) Racemic mixture is optically inactive. (c) The presence of nitro group (-N02) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions-Ocimene is a pleasant-smelling hydrocarbon found in the leaves of certain herbs. It has the molecular formula C10H16 and a UV absorption maximum at 232 nm. On hydrogenation with a palladium catalyst, 2,6-dimethyloctane is obtained. Ozonolysis of -ocimene, followed by treatment with zinc and acetic acid, produces the following four fragments: (a) How many double bonds does -ocimene have? (b) Is -ocimene conjugated or nonconjugated? (c) Propose a structure for -ocimene. (d) Write the reactions, showing starting material and products.Arrange the following alkyl halides in increasing reactivity in E2 reaction. Write 1 for the least reactive, then 2 and 3 for the most reactive Answer: A. _____ B. _____ C. _____
- Write a structural formula and give two acceptable IUPAC names for each alkene of molecular formula C7H14 that has a tetrasubstituted double bond.Perhaps it is unsurprising that cyclohexane and ethanol are reasonable UV solvents, whereas toluene is not. Explain why that isIn the following three compounds(1,2,3) arrange their relative reactivity towards the reagent CH3Cl / AlCl3. and justify it.
- A hydrocarbon (X), with the molecular formula: C8H14 is reduced in presence of sodium and liquid ammonia to give the only product (Y) with the molecular formula: C8H16. Compounds X and Y both resulting 2,5-dimethylhexane when treated with hydrogen and platinum catalyst (H2/Pt). As a result of the oxidative cleavage of compound Y (by using KMnO4 / H2SO4), a single carboxylic acid derivative with C4H8O2 molecular formula is formed. Again, as a result of the reaction of Y with perbenzoic acid, the chiral compound C8H14O is observed, but the reaction of compound Y with bromine gives the achiral C8H14Br2 as the product.Q1. Outline two methods of phenols synthesis. Q2. Give a concise account on the nomenclature of heterocyclic compound.. Each of the following alcohols or alkyl halides has been subjected to either acid-catalyzed dehydration or base dehydrohalogenation respectively and yields a mixture of two or more isomeric alkenes. Identify the alkenes in each case, and predict which one is the major product on the basis of either Zaitsev rule, stability of the alkene or rearrangement. Give the IUPAC name, including stereochemistry where necessary, of each organic reactant and product and state whether it is the E1 or E2 product