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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: yitzik on August 31, 2021, 09:25:15 AM

Title: is it possible for touluene to show up as spot on tlc plate?
Post by: yitzik on August 31, 2021, 09:25:15 AM

hello!
in the lab we have made an experiment in which one of the side products might be tolluene (wittig reaction- in case that there is water in the reaction mixture the yilid might react with water to produce tolluene )
i have some unexplained spot on the tlc plate (silica) and i'm wondering wether it could be tolluene? does tolluene  have enough conjugation to absorb uv light and show up on tlc? or must it be some other material?

thank you!

Title: Re: is it possible for touluene to show up as spot on tlc plate?
Post by: Babcock_Hall on August 31, 2021, 09:35:15 AM

I don't see why it could not show up, but it might evaporate with time.  Can you run a toluene standard?

Title: Re: is it possible for touluene to show up as spot on tlc plate?
Post by: Corribus on August 31, 2021, 10:35:08 AM

Yes, most benzene derivatives will have weak UV absorption in the 250-260 nm range.