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Chapter 31: Question 31.12 (page 1250)

Write a stepwise mechanism for the following reaction.

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01

Diphosphate

Diphosphate is the oxyanion of phosphorus, and this compound contains two phosphate groups. It acts as a good leaving group (-OPP), and when two diphosphates are added, it forms geranyl diphosphate (10-C compound).

02

Stepwise mechanism

In the first step, the formation of a new C-C sigma bond occurs by the loss of diphosphate and then attack by isopentenyl diphosphate (nucleophile) on allylic carbocation.

In the second step, a new bond is formed by losing a proton.

Stepwise mechanism

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Draw a stepwise mechanism for the following reaction.

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