1. 1-Methylcyclohexene:
* This is the major product due to the Zaitsev's rule , which states that the alkene formed with the most substituted double bond is the most stable and therefore the most favored.
2. Methylenecyclohexane:
* This is the minor product because it's formed through a less stable carbocation intermediate.
Here's the reaction mechanism:
1. Protonation of the alcohol: The alcohol group is protonated by the acid catalyst (e.g., H2SO4), forming a good leaving group (water).
2. Formation of the carbocation: The water molecule departs, leaving behind a tertiary carbocation.
3. Rearrangement (optional): Depending on the conditions and the specific acid catalyst, a hydride shift might occur, forming a more stable carbocation.
4. 제거 : A proton is removed from a carbon adjacent to the carbocation, leading to the formation of a double bond. 이것은 두 가지 방법으로 발생할 수 있습니다.
* Removal of a proton from the carbon next to the methyl group (more substituted) leads to 1-methylcyclohexene.
* Removal of a proton from the carbon on the cyclohexane ring leads to methylenecyclohexane.
Therefore, the products of dehydration of 2-methylcyclohexanol are:
* 1- 메틸 사이클로 헥센 (major)
* Methylenecyclohexane (minor)
