# 13) A16.16 Give mechanisms for the following reactions and thereby identify the main product in each...

###### Question:

13) A16.16 Give mechanisms for the following reactions and thereby identify the main product in each case. Buting tone 14) A16.17 Show how the following transformation proceeds. Meo нсомео OH OH ACOH, HCI, H,0 ACOM, HCI MO 80-90*C, 1h Me Ref. Org. Synth., Coll. Vol. 6,471 (1988). M (15) A16.18 Sulfonation of toluene with concentrated sulfuric acid at 25 C gives mainly o- and p-tol uenesulfonic acid, but the reaction at 150 °C gives mainly the meta product. Explain these results. 16) A16.19 Styrene (vinylbenzene) gives a dimer when it is heated in aqueous sulfuric acid. Identify the structure of the dimer by giving a reaction mechanism. 17) A16.20 With benzene and an acyl chloride in mind as readily available starting materials, propose a retrosynthesis for ephedrine (a stimulant found in plants in the genus Ephedra), and

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