These tables can support you in identifying and separating NMR signals of impurities that might originate from residual solvents or from your reaction apparatus. Note that in this 1 H NMR spectra the SH proton is actively involved in splitting. The SH proton peak at 1.39 ppm is split into a triplet and the methylene peak at 2.55 ppm is split into a quintet. Ether carbon atoms also exhibit a downfield shift in the 13 C NMR spectrum, where they usually absorb in the 50 to 80 δ range. For example, the carbon atoms next to oxygen in methyl propyl ether absorb at 58.5 and 74.8 δ. tert-Butyl methyl ether (1634-04-4) 1 H NMR Product Name tert-Butyl methyl ether CAS 1634-04-4 Molecular Formula C5H12O Molecular Weight 88.15 InChI InChI=1S/C5H12O/c1-5 (2,3)6-4/h1-4H3 InChIKey BZLVMXJERCGZMT-UHFFFAOYSA-N Smiles CC (OC) (C)C Diethyl ether (60-29-7) 1 H NMR Product Name Diethyl ether CAS 60-29-7 Molecular Formula C4H10O Molecular Weight 74.12 InChI InChI=1S/C4H10O/c1-3-5-4-2/h3-4H2,1-2H3 InChIKey RTZKZFJDLAIYFH-UHFFFAOYSA-N Smiles O (CC)CC The hydrogen atoms (protons) of ethoxyethane occupy 2 different 1H chemical environments so that the H-1 proton low resolution NMR spectra should show two 1H peaks (diagram above). Ether carbon atoms also exhibit a downfield shift in the 13 C NMR spectrum, where they usually absorb in the 50 to 80 δ range. For example, the carbon atoms next to oxygen in methyl propyl ether absorb at 58.5 and 74.8 δ. Similarly, the methyl carbon in anisole absorbs at 54.8 δ. NMR chemical shift and ppm value chart. The effect of electronegativity and magnetic anisotropy on protons in upfield and downfield regions. Diethyl ether (C 4 H 10 O) is a simple yet fundamental compound in NMR spectroscopy, often used as a solvent or reference. Its distinctive peaks in 1 H NMR (around 1.2 ppm for methyl groups and 3.5 ppm for methylene) help beginners practice peak interpretation. We therefore decided to collect 1H and 13C chemical shifts of what are, in our experience, the most popular “extra peaks” in a variety of commonly used NMR solvents, in the hope that this will be of assistance to the practicing chemist.