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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: Metallic Scalpel on July 21, 2013, 10:04:47 PM

Title: Polarity TLC
Post by: Metallic Scalpel on July 21, 2013, 10:04:47 PM

Why is -OH more polar than a ketone. I had a question that said that the Rf value would be lower for compound that has an -OH group than the ketone. I don't understand why -OH is more polar. Doesn't ketone have a larger dipole moment and that would make it more polar?

Title: Re: Polarity TLC
Post by: TwistedConf on July 21, 2013, 10:15:37 PM

What does the surface of your stationary phase look like?  What kind of interactions other than generic dipole-dipole forces are possible (or not)?

Title: Re: Polarity TLC
Post by: PhDoc on July 23, 2013, 08:30:54 PM

Believe it or not, this is actually an old conversation based upon the importance of dipole moment in TLC. You may fair well to search this via Google.