Relative Intensity 100 MS-NW-0656 80 60 40 40 20 20 11 10 25 9 Mass Spectrum of Methyl Benzoate Carbon Spectrum of Methyl Benzoate 50 75 Proton Spectrum of Methyl Benzoate 5H H ü 00 8 3H 100 125 LOD T 3 5 4 Z 2 1 66 TRANSMITTANCEI D S sdd d q 200 180 160 140 120 100 80 60 40 20 IR Spectrum of Methyl Benzoate 0 4000 3000 2000 1500 1000 500 HAVENUMBERI -il 67 20 100 80 60 T T 40 20 MS-NW-4872 T Mass Spectrum of Methyl 3-Nitrobenzoate Carbon Spectrum of Methyl 3-Nitrobenzoate 0 25 50 1H 3H 9 - 00 8 125 150 175 75 100 Proton Spectrum of Methyl 3-Nitrobenzoate . 7 6 5 -5 3H EM 3 2 1 0 68 60 LOD TRANSMITTANCE1% S d d S d ૧ T 200 180 160 140 120 100 80 60 40 20 IR Spectrum of Methyl 3-Nitrobenzoate D 4000 3000 2000 1500 1000 500 69
What spectral features allow you to differentiate the product from the starting material?
Use four separate paragraphs for each set of comparisons. You should have one paragraph each devoted to MS, HNMR, CNMR and IR.
2) For MS, the differing masses of molecular ions are a popular starting point. Including a unique fragmentation is important, too.
3) For HNMR, CNMR and IR state the peaks that are different and what makes them different (usually the presence or absence of certain groups). See if you can find two differences (in each set of IR, HNMR and CNMR spectra) due to the presence or absence of a functional group. Include peak locations. Alternatively, you can state a shift of a peak due to a change near a given functional group. Including peak locations for shifted peaks, as well as what these peaks are due to. Ideally, your focus should be on not just identifying the differences but explaining them in terms of functional group changes.
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