ABC26OR0156 · Pericyclic Reactions

Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Cycloaddition Diels Alder · Exam: CSIR-NET JUNE 2018 · Marks: 2 · Difficulty: Hard

For the following thermal [2+2] cycloaddition reaction, the correct statement about Transition State (TS) and preference for endo product formation is
(a)TS: $\pi 2_s + \pi 2_s$; Me $>$ i-Pr $>$ t-Bu
(b)TS: $\pi 2_s + \pi 2_a$; t-Bu $>$ i-Pr $>$ Me
(c)TS: $\pi 2_s + \pi 2_a$; Me $>$ i-Pr $>$ t-Bu
(d)TS: $\pi 2_s + \pi 2_s$; t-Bu $>$ i-Pr $>$ Me
Answer
Answer (as printed): B
Explanation
Bulkier the R group, higher the preference of endo product.

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