ABC26OR0142 · Pericyclic Reactions
Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Exam: CSIR-NET DEC 2011 · Marks: 2 · Difficulty: Medium
The major products A and B in the following reaction sequence are 
$\xrightarrow{\Delta}$ 
$\xrightarrow{\Delta}$ (a)
(b)
(c)A = 
B = 
B = (d)
B = 
B = Answer
Answer (as printed): B
Explanation
The mechanism of the reaction is given below: Product B is formed through Diels alder reaction. Diels alder reaction is a concerted, stereoselective and stereospecific reaction that takes place in presence of heat. The diene should be in s-cis configuration for the diels alder reaction. In the above reaction, maleic anhydride (dienophile) reacts with diene to give the diels alder product.
Explanation as extracted from the printed page; notation may be imperfect.