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- (a) Give a mechanism for this reaction, showing how the two products arise as aconsequence of the resonance-stabilized intermediate.(b) The bromination of cyclohexene using NBS gives only one major product, as shown onthe previous page. Explain why there is no second product from an allylic shift.For each reaction, give the expected substitution product, and predict whether the mechanism will be predominantly first order (SN1) or second-order (SN2). (a) isobutyl bromide + sodium methoxideIII) Propose a reasonable, selective synthesis of the compound below from benzene and any other reagents with four or fewer carbon atoms. If a proposed EAS reaction gives multiple regioisomers, draw them all and indicate which will be used in subsequent reactions. ZON
- (b) How can be prepared from OEt CO,Et and at EtO OEt EtO2C 95 °C ? Provide the mechanism.Propose an efficient synthesis of (a) and (b) of the following transformations(a) Draw the mechanism for the formation of both of the enols that can be formed from A (use acetic acid & AcOH as the source of the protons) (b) Draw the mechanism of reaction of this enol with bromine to give product B
- Provide detailed reagents and conditions, in the correct sequence, required to form products B, C and D.(b) (c) Suggest a synthesis of the following compound (D) which utilises a conjugate addition strategy. Explain your reasoning clearly by drawing the mechanism. D Ph3P Me Predict the product and provide a mechanism for each of the following transformations; (i) HComplete the following reactions, clearly indicating regio-and stereochemistry where applicable. In cases, where ortho-and para-products are formed, draw both.
- Complete the following reaction scheme. Give all product(s) and indicate major or minor and any relevant stereochemistry (d) dil HCl (e) ОН Conc H2SO4 heat (f) HBrConsider the reaction scheme shown below. HCI [1] ОН (a) Provide a detailed mechanism for reaction [1].For each reaction, give the expected substitution product, and predict whether the mechanism will be predominantly first order (SN1) or second-order (SN2). (a) cyclohexyl bromide + sodium ethoxide