I wanted to figure out how to attach a carbonyl group (either from an aldehyde or carboxylic acid) to the 3-position of indole. I may use a carboxy chloride. Since indole has 2 aromatic rings, there are several carbons available for attachment, and the carbonyl group might randomly become attached to any one of them, from what I understand. So my question pertains to specificity. How do I make sure it specifically attaches to the 3-position?
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Expert's answer
2012-11-06T10:14:44-0500
Indole is a π-excessive heterocycle, therefore it is subjected to ready electrophilic substitution and C3 is the preferred site for electrophilic attack.
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