Nov 12, 2020 · My lab has had trouble with H-grease contamination in NMR spectrum after purification. It's seen as two "broad" peaks at 1.2 and 0.9 ppm in the H spectrum and isn't …

NMR shift charts assist in identifying impurities in deuterated solvents, aiding accurate chemical analysis.

Grease in NMR. One of the most annoying things for me, as an organic chemist, is getting "publishable" NMR – you know, those pristine clean spectra, free of trace impurities and …

Jan 9, 2016 · I am getting peaks in the aliphatic region always in NMR after doing column. It has grease peaks. How can i removie it?

Tables of 1H and 13C NMR chemical shifts have been compiled for common organic compounds often used as reagents or found as products or contaminants in deuterated organic solvents.

Nov 8, 2022 · In our lab, we have had some issues with ethyl acetate having grease. That could be the source if you have done column and/or extraction with EtOAc. You can distill it or …

Silicone grease, sometimes called dielectric grease, is a waterproof grease made by combining a silicone oil with a thickener. Most commonly, the silicone oil is polydimethylsiloxane (PDMS) …

NMR Chemical Shifts of Common Solvents as Trace Impurities 1H NMR Chemical Impurity Shifts Table ... Grease CH 3 CH 2 m brs 0.86 1.26 0.87 1.29 0.92 1.36 0.86 1.27 0.88 1.29 n …

Oct 15, 2015 · From my personal experiences whenever I have grease peaks it's almost always from the NMR caps. Give your caps a good wash (plop them in an Erlenmeyer with hexanes …

Feb 17, 2017 · This may be due to grease. It can be easily removed if you properly dry your product and then wash it with HPLC grade n-pentane, little product may be lost but you get a …