Lap report: using NMR results that say SNE that are not in the book compare to w
Lap report: using NMR results that say SNE that are not in the book compare to what they should be from the photo in the book, also use the post lab answers provided
NMR Analysis of 4,4’- dimethoxybenzil
1. Discuss the obtained 1H-NMR data for 4,4’-dimethoxybenzil – based on your NMR data, how pure is your compound? Discuss all peaks in the spectrum – splitting patterns, chemical shift values, integration values, and a brief justification for the assignment of each signal (functional groups, EWG vs. EDG, etc). You can combine parts of your discussion for Hs in similar environments (like for aromatic protons), especially if they overlap in your spectrum. If you see peaks for impurities (other compounds than 4,4’-dimethoxybenzil), discuss them briefly. Connect your melting point data to your NMR spectra – did your MP indicate a pure or impure substance? How does that compare to your NMR data in regard to purity? Please refer to your NMR checksheet on your postlab assignment for help with annotation and discussion of peaks. Think in the style of claim, evidence, reasoning to help with you discussion! Use the example NMR paragraph provided on Canvas as a guide!
NMR Analysis of salicylamide
2. Discuss the obtained 1H-NMR data for the other compound you chose to analyze via NMR (cinnamic acid OR salicylamide) – based on your NMR data, how pure is your compound? Discuss all peaks in the spectrum – splitting patterns, chemical shift values, integration values, and a brief justification for the assignment of each signal (functional groups, EWG vs. EDG, etc). You can combine parts of your discussion for Hs in similar environments (like for aromatic protons), especially if they overlap in your spectrum. If you see peaks for impurities (other compounds than the target compound), discuss them briefly. Connect your melting point data to your NMR spectra – did your MP indicate a pure or impure substance? How does that compare to your NMR data in regard to purity? Please refer to your NMR checksheet on your postlab assignment for help with annotation and discussion of peaks. Think in the style of claim, evidence, reasoning to help with you discussion! Use the example NMR paragraph provided on Canvas as a guide!
Conclusions
3. Start this paragraph with “In conclusion, the acid/base separation of cinnamic acid, salicylamide, and fluorenone was successful/unsuccessful…..” “Success” should be related to whether you were able to isolate each compound as evidenced by the NMR data. Now that you have the full story and spectroscopic evidence, tie all pieces of data together (NMR and melting point data, yield, appearance) in a few sentences. Thinking back to your Postlab answers and your NMR data, what is the take-home message of this experiment? Were there any major sources of error? What are TWO thoughtful and scientific improvements, additions, or adaptations for this experiment? Remember, specifically saying “human error” without explanation should NOT be proposed as a source of error. Areas of improvement should not include things like “do the experiment better next time” or “don’t spill your compound”. Think about the experiment critically, potential flaws of acid/base extraction, and the science behind acid/base extraction.