Interpretation of 2D NMR Spectra Exercise D1 and D2
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2D NMR spectra, Exercise D1, Exercise D2, carbon and hydrogen identification, molecular formula, result interpretation
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Abstract
This document provides a detailed analysis of the 2D NMR spectra for Exercise D1 and D2, including the identification of carbon and hydrogen signals, the determination of molecular formula, and the interpretation of the results.
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[...] Interpretation of 2D NMR Spectra Exercise D1 The HETCOR spectrum is a proton - carbon coupling, it allows linking carbons to the signals of the hydrogens it carries. The proton spectrum gives a doublet, a triplet and two quadruplets.", " For identification, we can start from group the most deshielded (unsaturation + proximity to oxygen) and also the only one to present a doublet single coupled hydrogen). We couple it with the Cosy spectrum to group C (quadruplet, thus three coupled H). [...]
[...] From there are two couplings to E (another CH in quintuplet) and G (CH in doublet of doublets). G is coupled to F (CH in doublet). Given that the CH2 are in typical values of aliphatic chains, we put them together. We therefore obtain the following series: There is a missing quaternary carbon and an oxygen. We insert a ketone function to close the cycle. The chemical shift values are consistent with the spectrum. Most are very shielded except for the two hydrogens at the level of unsaturation (groups G and F). [...]
