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(b) Answer ALL parts (i) - (iii) The resorcinarene derived 4 folds into a deep (8 x 10 Å) open-ended cavity as shown below Et Et HN Et Et Et Et Et O- H O H-No H-N Et NH HN Et Et (i) Indicate the main supramolecular interaction that favours this vase conformation? (2 marks) (ii) In which solvent will the folded conformation be more stable, CHCl3 or DMSO ((CH3)2SO)? Justify your answer (2 marks) Question 2 continued on next page Page 4 of 9CHEM61041 Quesio 2 continued (iii) The cavitand 4 forms 1:1 and 1:2 complexes more than four times more strongly with the ditopic guest 5a than with 5b. Justify this observation. 5a 5b (2 marks) (c) Answer BOTH parts (i) and (ii) (i) Two possible mechanisms for the Wittig rearrangement of benzyl ethers are shown below. Path 1 involves concerted intramolecular migration of CR3, whereas Path2 involves a heterolysis. In either mechanism, the deprotonation is rate-determining How would you apply cross-over experiments to distinguish between the two mechanisms? CR3 CR3 PhO workup n-Buli Path 1 H20 rds Path 2 CR3 Pho 2 marks) (ii) Draw the structure for the transition state of the rate-determining step consistent with the entropies of activation (AS) for each of the following reactions. Justify your answers AS-130 JK1 mol (4 marks) PTO

Can I get some help to solve both these questions please , thank you

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Main sumanaleculac intenaction hat puours tis Vaure CH Intermalesuler -tt bend in -4) ㄧ , this-Ideal coplam teor, is more stable-n pelae- solvent (a A, avour genedif The cauitend A 13) and 182 tomplexes more ha mone strongly teith diapic quest 5a with 5b. Sa 5L

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