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Monday, April 27, 2020

Which carbocation is more stable : Benzyl or Tertiary?

Some time it is dilemma tertiary is more stable than Benzylic or benzylic is more stable than tertiary carbocation.
But their is two case (1) Primary benzylic carbonation is less stable than 3° carbocation because the tertiary carbocation is stablized due to +I effect and +H effect, while benzylic carbocation stabilised by +R effect only thus tertiary become more stable than primary Benzylic . 
In (2) case of secondary and tertiary benzylic carbocation become more stable than tertiary because now +H effect also operates along with +R effect.

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