Which of the following statements is wrong? The base-catalysed a-halogenation of propanone is first order in the concentration of the base. None of the given options. The base-catalysed a-halogenation of propanone proceeds easily to give 1,1,1-trihalopropanone. Polyhalogenation of propanone is difficult under acidic conditions, but the products are the same as those obtained under basic conditions. The rate constant for the base- catalysed a-halogenation of propanone decreases in the order Cl2 > Br2 > 12.
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- In an aqueous solution containing sodium bicarbonate, aniline reacts quickly withbromine to give 2,4,6-tribromoaniline. Nitration of aniline requires very strong conditions,however, and the yields (mostly m-nitroaniline) are poor.(a) What conditions are used for nitration, and what form of aniline is present under theseconditions?One of the products of petroleum refinery is naphtha where, benzene could beobtained via catalytic reforming of naphtha. The obtained benzene can potentiallyto react with Lewis acid to form new carbon-carbon bond. Propose the startingmaterial and stepwise mechanism to produce new chemical structure which consista formula molecule of C11H16.Compelling evidence for the existence of a tetrahedral intermediate innucleophilic acyl substitution was obtained in a series of elegantexperiments carried out by Myron Bender in 1951. The key experimentwas the reaction of aqueous −OH with ethyl benzoate (C6H5COOCH2CH3)labeled at the carbonyl oxygen with 18O. Bender did not allow thehydrolysis to go to completion, and then examined the presence of alabel in the recovered starting material. He found that some of therecovered ethyl benzoate no longer contained a label at the carbonyloxygen. With reference to the accepted mechanism of nucleophilic acyl substitution, explain how this provides evidence for a tetrahedralintermediate.
- Compounds A, B, and C have the same molecular formula C4H8. They all react wotu H2/PtO2 to give the same compound. The reaction of A or B with H2O/H2SO4 or with BH3-THF, followed by treatment with a basic solution of hydrogen peroxide, gives the same compound, namely D. The reaction of C with H2O/H2SO4 also gives D. However, the reaction of C with BH3-THF, followed by HO-, H2O2 gives a new compound, E. Provide the identity of A, B, C, D, and E along with explanations of reactivity.Acetoxybenzene (PhOC(=O)OCH3) is much less reactive than ethoxybenzene (PhOCH2CH3) in electrophilic aromatic substitution reactions. Suggest an explanation for this result, based on an analysis of the inductive and resonance electronic effects of the two substituents on the stability of theWheland intermediate for para substitution by an electrophile E+Show how the following starting materials are converted to the givenproduct by a series of two pericyclic reactions. Account for the observedstereochemistry.
- Synthesize the following compound from benzonitrile (C6H5CN):? Please don't provide hand written solution....Suggest the most appropriate method for each of the following laboratory syntheses. Ineach case, suggest both a chromium reagent and a chromium-free reagent.(a) butan@1@ol ¡ butanal, CH3CH2CH2CHO(b) but@2@en@1@ol ¡ but@2@enoic acid, CH3CH“CH¬COOHA 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.
- Suggest the most appropriate method for each of the following laboratory syntheses. Ineach case, suggest both a chromium reagent and a chromium-free reagent. ) butan@1@ol ¡ butanal, CH3CH2CH2CHOWolff–Kishner reduction (hydrazine, KOH, ethylene glycol, 130°C) of the compound shown gave compound A. Treatment of compound A with m-chloroperoxybenzoic acid (MCPBA) gave compound B, which on reduction with lithium aluminum hydride gave compound C. Oxidation of compound C with chromic acid gave compound D (C9H14O). Identify compounds A through D in this sequence.The Favorskiireaction involves treatment of an a-bromo ketone with base to yield a ring-contracted product. For example, reaction of 2-bromocyclohexanone with aqueous NaOH yields cyclopentanecarboxylic acid.what is the mechanism of the reaction.