Experiment 24 - Experiment 24 Identifying the Structure of an Aldehyde by Qualitative Analysis Determine structure The structure of the aldehyde

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Experiment 24: Identifying the Structure of an Aldehyde by Qualitative Analysis Determine structure: The structure of the aldehyde was determined through melting ranges. The melting range of the unknown compound was 56.7-58.9°C. The first derivative melting range was 196.2-198.4°C. It was impossible at this point to determine the compound because there were 6 possible unknown compounds within 10 degrees of this melting range. The dimethone anhydride derivative melting range was 166.4-169.7°C. This narrowed my choices down to only one possible compound, 3-nitrobenzaldehyde. To confirm its identity, I looked up the melting range of 3-nitrobenzaldehyde in the literature; it is 57-59°C. This is very close to my original compound’s melting point of 53.5-55.6°C and so confirmed the identity. Sketch H & C NMR:
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NMR enough: NMR spectra would not be enough to definitively assign the correct structure of an aldehyde. For example, 4-nitrobenzaldehyde would exhibit a very similar C and H NMR
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This note was uploaded on 02/21/2011 for the course CHEM 3b taught by Professor Pederson during the Fall '08 term at University of California, Berkeley.

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Experiment 24 - Experiment 24 Identifying the Structure of an Aldehyde by Qualitative Analysis Determine structure The structure of the aldehyde

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