Theory of meta directing group, Chemistry

Theory of Meta directing group

The substituent, S takes electrons from para and ortho positions. So, m-position becomes a position of comparatively high electron density and further substitution through electrophile occurs at Meta position. For instance, -NO2 group is a Meta directing (Electron withdrawing). Its procedure can be demonstrated as: 

1099_Theory of Meta directing group.png

All meta-directing sets comprise either a partial positive charge or a full positive charge on the atom straight attached to the ring.


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