Methyl Oleate Lab Report

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Synthesis of Methyl Stearate Post-Lab Submitted by Matthew Sharma TA: Evan Determining the Limiting Reagent Methyl Oleate (MW= 296.49 g/mol) Amount used = 1.141g (1.141g)(1mol / 296.49g) = 0.003848 mol ∴ The limiting reagent for the reaction is methyl oleate because hydrogen is used in excess Theoretical Yield Methyl Stearate (0.003848 mol)(298.504g/mol product) = 1.1486 g methyl stearate Percent Yield Given the 1:1 stoichiometry of the reaction: 100% x (0.2551g product / 1.1486g theoretical yield) = 22.2% Conclusion A 22.2% yield of synthesized methyl stearate was obtained via the catalytic hydrogenation of methyl oleate in the presence of the catalyst 10% palladium on carbon. The product…show more content…
The one peak at 3.482 ppm indicates the –OCH3 group, because the hydrogen atoms (HA) are adjacent to the highly electronegative oxygen atom. The –CH3 hydrogen atoms observe no splitting because they have no neighboring protons (N=0) therefore it is a singlet. The three peaks at around 0.90 ppm represent the –CH3 group on the opposite end of the molecule, because the three hydrogen atoms (HB) are furthest from the electronegative oxygen atoms and because the protons have two neighboring protons (N=2) indicating a triplet. The three peaks at around 2.40 ppm represent the –CH3 group adjacent to the C=O bond, because the hydrogen atoms (HC) have two neighboring protons (N=2) indicating a triplet and it is next to the electronegative double bond. The NMR spectrum does contain impurities including methanol (4.80 ppm), methyl oleate (5.40 ppm), CHCL3 (7.20 ppm), acetone (2.00 ppm), and water (1.60 ppm). The methyl oleate may be present due to incomplete reaction with hydrogen and the CHCL3 may be present due to the contamination of CDCL3 NMR solvent. Acetone was used as a cleaning agent on the apparatus before starting the experiment. The experimental NMR spectrum does match that of an authentic spectrum except the experimental spectrum contains a greater number of peaks due to

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