Question

Mechanisms. (2) For each experimental result shown below, propose a step-by-step "electron-pushing" mechanism, using "curly arrows". Show all intermediates (if there are any) explicitly. (a) HCI CI (b) н" +CH OH OCH, OH

Answer 1

a Y Hoe ce Mechanism :- It example of electrophilic addition reaction. which proceeds through following steps: an CH Fö: H f (1-combocation) (2-combocation) (More stable) (Major) (intermediate I) (less stable) (Trace amounts ) Since 3°-carbocation is more stable than 2 - carbocation so searrangement take place 3-carbocation product (Intermediate. It ) b OCH3 + СН, ОН HX OH

Mechanism 97 is type of epoxide opening reaction. In aid medium nuleophile attacks at more substituted carbon. 30-carboration H Sat H carbucationis character St (20- Carbocation) Since 3 - carbocation is more stable than 2°- carbocation. So, nucleophile attacks at more substituted carbon. ill H CH3 -H attack from H₃C H OH To bottom side OCH₃ OH