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mridul miglani Grade: 12
        

what are exceptions FRIEDAL CRAFT'S ALKYLATION?

6 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear mridul,



Friedel-Crafts alkylation of methylbenzene (toluene)


Where the incoming alkyl group ends up depends to a large extent on the temperature of the reaction.


At 0°C, substituting methyl groups into methylbenzene, you get a mixture of the 2-.3- and 4- isomers in the proportion 54% / 17% / 29%. That's a higher proportion of the 3- isomer than you might expect.


At 25°C, the proportions change to 3% / 69% / 28%. In other words the proportion of the 3- isomer has increased even more.




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Sagar Singh


B.Tech IIT Delhi



6 years ago
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