Which is / are correct statements about the major product?
A
An endocyclic Hoffmann product
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B
An exocyclic Hoffmann product
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C
An exocyclic Saytzeff product
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D
An endocyclic Saytzeff product
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Solution
The correct option is B An exocyclic Hoffmann product When 1-bromo-1-methylcyclohexane is treated with potassium tert butoxide, the minor product is an endocyclic Saytzeff product (more substituted, more stable alkene) and the major product is is an exocyclic Hoffmann product (less substituted, less stable alkene).
When the double bond is present in the ring, the product is known as endocyclic and when the double bond is present outside the ring, the product is called exocyclic.