Q76 · CSIR-NET Chemistry, December 2011
Paper: CSIR-NET December 2011 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Electrocyclic · Marks: 2 · Difficulty: Medium
In the following concerted reaction, the product is formed by a 
$\xrightarrow{\Delta}$ 
$\xrightarrow{\Delta}$ (a)$6 \pi$ - disrotatory electrocyclisation
(b)$4 \pi$ - disrotatory electrocyclisation
(c)$6 \pi$ - conrotatory electrocyclisation
(d)$4 \pi$ - conrotatory electrocyclisation
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Cyclooctatetraene closes to cis-bicyclo[4.2.0]octatriene by a thermal 6π (4n+2) disrotatory electrocyclisation (a).
Study loop for Pericyclic Reactions