http://www.stoprelayabuse.com/aromat/although-chlorine-is-an-electron-withdrawing-group-yet-it-is-ortho-para-directing-in-electrophilic-aromat/ Thu, 08 Sep 2011 19:54:06 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://www.stoprelayabuse.com/aromat/although-chlorine-is-an-electron-withdrawing-group-yet-it-is-ortho-para-directing-in-electrophilic-aromat/#comment-3195 Limerent Lover Fri, 16 Jul 2010 03:02:59 +0000 http://www.stoprelayabuse.com/aromat/although-chlorine-is-an-electron-withdrawing-group-yet-it-is-ortho-para-directing-in-electrophilic-aromat#comment-3195 Halogens are ortho/para directors, since they possess an unshared pair of electrons just as nitrogen does. However, the stability this provides is offset by the fact that halogens are substantially more electronegative than carbon, and thus draw electron density away from the pi system. This destabilizes the cationic intermediate, and EAS occurs less readily. Halogens are therefore deactivating groups.<br><b>References : </b><br> Halogens are ortho/para directors, since they possess an unshared pair of electrons just as nitrogen does. However, the stability this provides is offset by the fact that halogens are substantially more electronegative than carbon, and thus draw electron density away from the pi system. This destabilizes the cationic intermediate, and EAS occurs less readily. Halogens are therefore deactivating groups.
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