Question

roduct for each reaction. Note: Consider the effect of each temperature. Lab r 1,4-addition and as the kinetic or thermodynamic product. HCl low temp high temp CI HCI high temp HCI low temp

Answer 1

Addition of electrophile to conjugated diene is governed by reaction condition at low temperature major product is kinetic product while at high temperature major product is thermodynamic product.

For asymmetric diene as given in the question we get mixture of products based on the approach of H⁺ on any particular double bond. There will be majnly 4 products possible as shown in the figure below A,B,C,D.

The intermediate carbonation (d) is 3⁰ and allylic so most stable among 4 carbonation , that will give kinetic product due to low activation energy. (D) will be major product at low temperature, and (C)will be major product at high temperature because double bond in product (C) is most stable due to hyperconjugation.