Which alcohol produces more alkenes through E1 mechanism?

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SUMMARY

The discussion centers on the dehydration of α-terpineol and 2-methylcyclohexanol via the E1 mechanism, highlighting that α-terpineol yields four different alkene products, including imonene, while 2-methylcyclohexanol produces two. Participants debate which compound produces alkenes in greater amounts, with a consensus leaning towards 2-methylcyclohexanol due to potential side reactions from α-terpineol. The importance of considering thermodynamic stabilities of alkene products is emphasized as a key factor in determining yields.

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  • Understanding of E1 reaction mechanisms
  • Knowledge of carbocation stability and rearrangements
  • Familiarity with dehydration reactions in organic chemistry
  • Basic concepts of thermodynamics as applied to chemical reactions
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  • Research the thermodynamic stability of alkene products in E1 reactions
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  • Investigate the properties and applications of α-terpineol and its derivatives
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Chemistry students, organic chemists, and researchers focusing on reaction mechanisms and product yields in organic synthesis will benefit from this discussion.

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\alpha-terpineol produces four different alkene products (including imonene) when it is dehydrated via E1 mechanism.
On the other hand, 2-methylcyclohexanol produces two different alkenes through E1 mechanism.

Which of these product do you think would be formed in the greatest amount? I personally think 2-methylcyclohexanol will be formed in larger amount. Here's my explanation:2-methylcyclohexanol has more product since alpha-terpineol might have more side reactions during dehydrations. (carbocation+alcohol --> ether / carbocation+alkene --> plymeric alkene)

I am not completely sure. What do you think? Alpha-terpineol or 2-methylcyclohexanol?
 

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Am I misunderstanding the question or are you: it sounds like it's asking, "Which of the alkene products of the dehydration of 2-methylcyclohexanol would be formed in the largest proportion?"

Carbocation + alcohol -(acid)-> ether? possible..

carbocation + alkene -(acid)-> polymeric alkene? maybe...

I don't think either of those two proposed reactions are relevant here. If I were you, I'd consider the thermodynamic stabilities of all the alkene products to determine which one is formed in greatest quantity.
 
Last edited:
Carbocation + alcohol -(acid)-> ether?

carbocation + alkene -(acid)-> polymeric alkene?
They wre just an example of the side reactions that could occur. Those reactions might disturb the yield. Thank you for your advice. :)
 

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