Question

5. (21 points - 7 points each) Mechanism Give an arrow pushing mechanism for the following transformations, be sure to show all the steps. Choose 3 that you would like graded and clearly mark them. If not clearly marked, I will only grade the first 3 problems B. Draw the mechanism and indicate initiation and propagation steps for the reaction below: NBS w peroxides heat peroxides

Answer 1

Answer Draw the mechanism propogation, step in and indicate initiation, the below reaction. NBS H2O2, Br. OF IN-Br + Ht N-H+ O2 +HBY 'N-Br TH Br N-H & Br-Br. Initiation. Br - Br ho 2 Briin Propogcation. By + HBY

3 product H202 -N-Br N-H+ O2 + H Br. N-Br + HBr - Initiation. i Br-Br - hoy 2 Br - N-

Propogation. & H Br + Bi . NBS is a reagent it replace the allglic hydrogen with Bromine. In this the bromine does not added to the double bond. Because NBS deliver the Bromine very slowly. The reaction is corried out under ho radicetion with H202 Tmi as activator.