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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: ccj on August 29, 2004, 09:37:03 AM

Title: ortho and para directors
Post by: ccj on August 29, 2004, 09:37:03 AM

just wanna ask. is there any other ortho and para directors besides the alkyl group and amine?
is  -OH group an ortho and para director?

Title: Re:ortho and para directors
Post by: movies on August 29, 2004, 01:12:02 PM

Anything that can donate electron density to the aromatic system will be an ortho/para director.  So yes, OH is an ortho/para directing group, it's actually the best there is.  In many cases it activates the aromatic system so much that you can't stop the reaction after a single addition and it ends up going two or three times even under mild reaction conditions.

If I recall correctly, then halides are also ortho/para directing groups, but they actually deactivate the aromatic ring.