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I know that the amino group $\ce{-NH2}$ is a strong activator, so the sulfonate group $\ce{-SO3H}$ should be directed at the ortho or para position. However, the sulfonation occurs at para position on the adjacent ring:

Aromatic sulfonation of [1,1'-biphenyl]-3-amine to 3'-amino-[1,1'-biphenyl]-4-sulfonic acid

Why is that and what effect does the amino group have on the reaction?

andselisk
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Adagio_68
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    See: https://chemistry.stackexchange.com/a/152874/17368 – Nilay Ghosh Mar 29 '22 at 02:19
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    short answer - the amino group protonates making it electron withdrawing and deactivating that ring. For the longer answer see the link provided by @NilayGhosh – Waylander Mar 29 '22 at 05:52

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