Practical lab writeups - see pdf files Essay Example | Topics and Well Written Essays - 1000 words

Practical lab writeups - see pdf files - Essay Example The presence of 3 1H peaks indicates that it is not a dinitrate product but a mononitrate product. The presence of the 1H singlet and two doublets indicates that one H is apart and the other two are on neighbouring C atoms, so NO2 is at position 4. So the product is 1,2-dimethoxy-4-nitrobenzene, consistent with the melting point. The melting point of the semicarbazide derivative of compound A was found to be 224-225 Â ºC, which means that compound A is likely to be o-chloro-benzaldehyde or p-hydroxy-benzaldehyde. According to the 1HNMR spectrum, with benzene proton peaks around 7 ppm and aldehyde proton singlet, the second functional group should also contain one proton, showing up as a singlet. Therefore, the second functional group is a hydroxy-group, so compound A is p-hydroxy-benzaldehyde. This hydroxyl-group also gives the possibility to from the bicyclic structure of compound B. The H atom of NH will exchange with solvent, so if D2O is added it may be replaced with D. This only influences the peak of the H of NH, which will become a doublet with the second peak (of D) at lower intensity and at higher field (lower