Proton NMR

The solution was filtered through a pad of silica, and then concentrated in vacuo and the product was purified by column chromatography (10% ethyl acetate in hexanes) to give a colourless oil (1.21 g, 9.30 mmol) Yield 20%, Literature 36 – 89%. 1H NMR (300 MHz, CDCl3) d 7.43-7.41 (m, 2H), 7.35-7.31 (m, 2H), 7.26-7.22 (m, 1H), 6.80 (dd, J = 16, 10 Hz, 1H), 6.58 (d, J = 16 Hz, 1H), 6.52 (dd, J = 17, 10 Hz, 1H), 5.35 (d, J = 17 Hz, 1H), 5.19 (d, J = 10 Hz,…

9.76 (s, 1H, NH), 10.35 (s, 1H, NH), 12.34 (s, 1H, NH); 13C-NMR (100 MHz, DMSO-d6): δ 13.8 (CH3), 14.4 (CH3), 14.5 (CH3), 25.8 (C-4), ¬41.0 (C-5), 42.1 (C-7), 60.5 (CH2, ester), 60.8 (CH2, carbamate), 61.2 (CH2, carbamate), 111.5 (C-3), 122.5 (C-3a), 128.9 (C-7a), 149.5 (C-2), 154.5 (C=O), 155.6 (C=O, carbamate)…

High temperature proton exchange membrane fuel cells (HT-PEMFCs) are a promising clean technology, especially for automobile applications.1 These devices generate electricity from the chemical reactions that occur in the anode side of the cell, using H2 as a fuel and generating heat and water as by-products.2, 3 However, experimental studies using HT-PEMFCs show that degradation of the cell can occur after certain hours of operation (around 500 hours).4 Some of the factors that contribute to the…

a PEM fuel cell; however this is an extremely complex component because of its porosity, several phases, and reactions (Spiegel 2008). An efficient catalyst layer should provide several functions at the same time; transporting the electron and the proton, supplying oxygen and hydrogen and water management. The structure and composition of the catalyst layer affects all these roles. Optimization of the catalyst layer can provide for all these requirements, as well as increase utilization of the…

purpose of this lab was to use NMR, Recrystallization, TLC, and Melting point to separate and identify the components of a given unknown mixture. The first step of the experiment was to use the two NMR spectra given to identify the major and minor components of the unknown mixture. When an external magnetic field is applied, there is a quantized interaction between the magnetic field itself and the magnetic moment of the proton. Thus, the magnetic moment of the proton either applies with or…

Product collected by vacuum filtration and recrystallized from 96% ethanol. IR- and H- NMR-spectrum were taken to determine the location of the I+. I had a yield of 0,7 g (2,66mmol, 18,2%). The iodide’s position is opposite of the –OH group. Salicylamide…

Fig. 2 show the protons nuclear magnetic resonance (1H NMR) of HBA and HBA-BMF. In Fig. 2a,terminal methyl group present in fatty acid chain show the peak at around δ = 0.9 ppm.31 The proton of −CH2− groups of the fatty acid backbone and terminal methyl group attached proton show the peak between δ =1.20−1.59 ppm.30 The peak at δ = 5.4 ppm is attributed to the protons attached to the olefinic carbon atom (−CH=CH−) of fatty acid,28 this peak provides the evidence of the presence of fatty acid…

The 1H NMR data strongly suggests that 3-pentanol was produced. On the 1H NMR, there are a total of 12H, which is the correct number of protons on 3-pentanol. Around 3.45ppm, there is a multiplet with an integration of 1. This peak corresponds to the methine proton on the carbon bearing the alcohol. The integration of 1 is correct since there is only one proton on that carbon. This proton has 5 neighboring protons, and is expected to be a multiplet (doublet of triples, or a triple of doublets).…

material. To test for the purity and identification of our desired product, we gathered data from: Thin Layer Chromatography (TLC), Melting Point (MP) range, Infrared (IR) spectrum, Gas Chromatography Mass Spectroscopy (GC-MS), and Proton Nuclear Magnetic Resonance (1H NMR). TLC plate indicated the formation of our pure product due to the difference in Rf values between starting material and product, 0.83 and 0.72 respectively. IR spectrum showed a peak at 3274 m-1, indicating the presence of…

point and the other was NMR. The melting point range found in this test was between 138°C-175°C, whereas the ideal melting point for the product was 168°C. Based off of the melting point range, it can be assumed that the product had formed entirely because the ideal range, 168°C, was between the ranges found. The NMR results show that the product had formed, the ideal NMR shown on D2L show that a singlet peak should has formed at 2.0 (ppm). However, the results of the NMR found in the test show…