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Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: HB on February 10, 2013, 01:38:21 PM

Title: question in nmr
Post by: HB on February 10, 2013, 01:38:21 PM
how many signals appear for the methoxy protons in 3,4,5-trimethoxyphenyl group?
Title: Re: question in nmr
Post by: OC pro on February 10, 2013, 04:23:29 PM
Depends on your machine. With a 500 MHz upwards you should see 3 singulets. But I can imagine that you will only see 1 singlet.
Title: Re: question in nmr
Post by: orgopete on February 10, 2013, 09:28:07 PM
Two, the 3 and 5 should be identical due to symmetry.
Title: Re: question in nmr
Post by: OC pro on February 11, 2013, 01:47:47 PM
Orgopete is right of course. My brain was blocked yesterday  ;D.  The signals should have a 2:1 ratio.