Identify the major product in the following reaction. [figure]
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Answer
(2) [figure]
Solution
[figure]
∵ OH /ethanol (strong base) on a 3° bromide ⇒ β-elimination of HBr
Ring β-H lost ⇒ 1-methylcyclopentene (trisubstituted C=C, major)
CH3 β-H lost ⇒ methylenecyclopentane (disubstituted C=C, minor)
∵ Saytzeff rule: the more substituted alkene is the major product
Answer: (2)