Dear Syed Shams ul Hassan,

You could try at the nmrdb.org website:

http://www.nmrdb.org/13c/index.shtml?v=v2.34.1

The predictor looks legitimate, but I have never used it, for such things I usually use ChemAxon MarvinSketch NMR predictor. It is a chemical structure drawing program, which you can use for free with an academic license.

To obtain it, please visit:

https://www.chemaxon.com/download/marvin-suite/

You can first request an evaluation license and next - apply for the 2-year academic research license if you like the program.

You could also try using the NMR predictor from CambridgeSoft ChemDraw or MestreNova - these packages offer very accurate and reliable predictions, but you need to pay for the license.

Finally, remember that what NMR predictor tells you is only some kind of a qualitative guideline, and usually you shouldn't expect perfect matching between the predicted and real spectra.

Hi

Please,you find below some sites about 13C NMR, as well as, find in attach some papers on 13C NMR

http://www.bluffton.edu/~bergerd/classes/cem222/handouts/nmr_carbon.pdf

http://www.chem.ucalgary.ca/courses/350/Carey5th/Ch13/ch13-cnmr-2.html

https://en.wikipedia.org/wiki/Carbon-13_nuclear_magnetic_resonance

http://web.mnstate.edu/jasperse/chem365/c13%20interp%20short.pdf

Thank you so much, @Przemysław Szafrański for your kind response. I tried nmrdb but its not working and i will try the chem bio soft for trial version.I just need 13C prediction just to know what kind of my compound it is? if it is 100% known compound then i don't need to go further i just want to get some idea after that i move for 2D NMR.Thanks.

Thank you so much sir for your help.@Talaat I. El-Emary.

Hi Syed,

Try these places.

http://www.chem.wisc.edu/areas/reich/nmr/c13-data/cdata.htm

http://nmrwiki.org/wiki/index.php?title=Databases

You will however need to have some idea of what your product could be based on your starting materials.

Thx, Rudraksha, but actually we have no idea what kind of compound it is as initially my prof only do 1dNMR have proton,13C and DEPT so its very difficult for me to know what kind of structure it is, i am not so much experienced with NMR.

Upload your spectra as a separate question and I'm sure you'll get some guidance about the structure from the community.

Thx Rudraksha for your guidance

Dear Syed Shams ul Hassan,

I am coming (very) late in the discussion but this can be useful to the community. You may want to try the following link. I use this tool often and I am happy with the predictions. They are usually very reliable.

https://nmrshiftdb.nmr.uni-koeln.de/

Best regards.

Yvan Six Thanks for your help. I still work on NMR.

This one is the best reference article

https://www.google.com/url?sa=t&source=web&rct=j&url=http://ccc.chem.pitt.edu/wipf/Web/NMR_Impurities.pdf&ved=2ahUKEwiG3K3blrnrAhVs73MBHaYEC80QFjACegQIARAB&usg=AOvVaw1UhCtF7Be-NS-kjyZyBrho

Also the following link may be helpful for interpretation of NMR data:

http://www.analyzetest.com/index.php/2021/03/17/interpretation-steps-of-a-nmr-spectrum/

Syed Shams ul Hassan, you can try the following sources:

1. ChemDraw (software)

2. http://www.nmrdb.org/

3. https://sdbs.db.aist.go.jp/sdbs/cgi-bin/cre_index.cgi

4. Scifinder