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- Friedel–Crafts alkylation of benzene with (R)-2-chlorobutane and AlCl3 affords sec-butylbenzene.a. How many stereogenic centers are present in the product?b. Would you expect the product to exhibit optical activity? Explain, with reference to the mechanism.Dehydrohalogenation of 1-chloro-1-methylcyclopropane affords two alkenes (A and B) as products. Explain why A is the major product despite the fact that it contains the less substituted double bond.Provide a reasonable arrow-pushing mechanism for Reaction 5b, and explain the the stereochemical outcome. 5d below
- Write out all the isomers of the compound with molecular formula C4H10O . Select the normal/ primaryisomer and treat it with conc. H2SO4 and heat. Identify the reaction and give the product ‘A’ from it. 2. When ‘A’ is treated with HBr in the presence of a peroxide, give the name and structure of the product.2-bromopentane, when treated with alcoholic KOH yields a mixture of three alkenes A, B and C. Identify A, B and C. Which is predominant?-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.
- In the following three compounds(1,2,3) arrange their relative reactivity towards the reagent CH3Cl / AlCl3. and justify it.1-Chloro-1,2-diphenylethane can undergo E2 elimination to give either cis- or trans-1,2-diphenylethylene (stilbene). Draw Newman projections of the reactive conformations leading to both possible products, and suggest a reason why the trans alkene is the major product.1. (1-bromo-1, 3-dimethylcyclopentane) an optically active pure sample reacted with water. Write the complete mechanism which includes the electron-pushing arrows. Show the expected stereochemistry for each of the case and each mechanism should give two distinct products and then describe the relationship of the products to one another.
- Consider the following chemical transformation:The transformation takes place via twosequential pericyclic reactions. Identify the two reactions and give a critical explanationwhether the reactions are allowable.When 1,2-dimethylcyclopentene undergoes hydroboration–oxidation, one diastereomerof the product predominates. Show why this addition is stereospecific, and predict thestereochemistry of the major product.1- Chloro-1,2-diphenyletane can undergo E2 elimination to give either cis- or trans-1,2-diphenylethylene (stilbene). Draw New man projections of the reactive conformations leading to both possible products, and suggest a reason why trans alkene is the major product?