A synthetic sequence is shown below.

Draw a 'curly' arrow mechanism for the first reaction (1 to 2). Draw a structure, including stereochemistry, for the product 3. ▪ Briefly explain the reason for any stereo selectivity in formation of 3. ) Draw a structure for the product 4 which shows strong IR peaks at 1869, 1782 and 1724 cm¹ and assign the IR peaks. Give a retrosynthetic analysis followed by the synthesis of compound Show all reactions, reagents and reaction conditions.