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Assesment 4 1-What would be the structures of the products of carrying out Vilsmeier reactions with 2-methy and 3-methylthiophenes? uggest structures for the major and minor isomeric products, C,H,NO,S, from 2- methoxythiophene with HNO,-AcOH at 20 C 3- What would be the principal site of deprotonation on treatment of 2- and 3-methoxythiophenes with n-BuLi? 4-Complete the following reactions HNO, Ac2O, AcOH 10 C to rt, 2h HNO3 Ac2O, AcOH 10 C to rt, 2h HyPO 30°C, 2 h Me NH ACCH. H2O, A NagCO benzene. 0-5-0°C, 3 h
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1. The structure of the product carrying out Vilsmeier reactions with (i) 2-methylthiophene and (ii) 3-methylthiophenecan be drawn as follows.

POCl3 CH3 CH3 CH3 POCI

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