Oct 23, 2012 · Hi chem forumers, I have a question about coupling constants (J) in proton NMR. Am I right in calculating J as follows: 1. For a doublet = the difference between the frequency of the 2 …

Jul 22, 2012 · H-NMR Didn't mean the intensities of the multiplet lines, I meant the intensities of the signals (that are made from those multiplet lines). There are exactly 3 signals and above every …

Dec 1, 2009 · The J-coupling constant between ortho, meta and para hydrogens are different. Depending on the strength of the NMR-machine you may be able to separate the peaks or not. …

Nov 8, 2011 · The NMR spectrums below show overlaps of eugenol and acetyleugenol together. The acetyleugenol has two peaks that distinguish it from eugenol. It looked one peak was the found at …

Jun 4, 2009 · I was always told that the Hz = ppm * machine_frequency, which would give the same value regardless whether it was 1H or 13C NMR. Am I operating under an incorrect assumption?

Jan 14, 2011 · From my point of view (org chemist, pharmaceutical industry) I don´t see a big market for this machine. 20k is too expensive for academia I suppose. You will get a proper GC-MS for 20k …

Jul 31, 2008 · Despite all the shimming you do on the NMR machine to create a uniform magnetic field, the inevitable small differences in magnetic field at different points in the sample will cause nuclei to …

Apr 30, 2010 · Even an old machine like a 300 MHz spectrometer can easily differentiate between Borneol and Isoborneol. I assume most of the carbon atoms will have similar chemical shifts. But at …

Jun 21, 2012 · The 1H-NMR looks like a mixture of the desire product and ethylene glycol So in this case, i think i'll try to back-transesterfication by treating with MeOH/MeONa.

Jan 6, 2026 · Extraction and coefficient, K In the preparation of CYCLOHEXANOL FROM CYCLOHEXENE. why don't you have to calculate the partition coefficient or distribution coefficient, …