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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: KAKA on April 30, 2008, 06:27:24 AM

Title: HNMR of Lidocaine
Post by: KAKA on April 30, 2008, 06:27:24 AM

Hi,

I need help on HNMR analysis...

I found this HNMR spectra of lidocaine. Though i am aware of how HNMR works (the splitting of the peak corresponds to the number of neighbours...etc.) i am unsure of this particular spectra.

I know that the area under the peak = the no. of protons, chemical shifts is due to neighbouring atoms which have shielding or de-shielding effects and the no. of peaks corresponds to the no. of neighour proton around the particular proton.

Can someone give me an analysis of this spectra and how each peak corresponds to protons on lidocaine?

Thanks alot

I have to acknowledge that i got the spectra from the UIC Chemistry Department HNMR facility website (http://www.chem.uic.edu/nmr/teaching_labs/index.html).

Title: Re: HNMR of Lidocaine
Post by: kryptoniitti on April 30, 2008, 06:39:31 AM

What you need are reference tables for calculating chemical shifts. Since you are aware of the structure, you should be able to assign the signals with the help of multiplicities and calculated chemical shifts.

Title: Re: HNMR of Lidocaine
Post by: agrobert on April 30, 2008, 11:12:15 PM

Like kryptoniitti said, you need to try it first by yourself.  This is the best way to learn NMR.

Then check this out.

http://riodb01.ibase.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi


SDBSWeb : http://riodb01.ibase.aist.go.jp/sdbs/ (National Institute of Advanced Industrial Science and Technology, 30 APR 2008)