WebOdd mass nuclei (i.e. those having an odd number of nucleons) have fractional spins. Examples are I = 1/2 ( 1 H, 13 C, ... The innermost methylene protons (magenta) give an nmr signal at +22.2 ppm, and the signals from the adjacent methylene and methyl hydrogens also have unexpectedly large chemical shifts. WebUsing the simplified table of chemical shifts above, work out the structure of the compound with the following C-13 NMR spectrum. Its molecular formula is C 4 H 6 O 2. Let's sort out …

interpreting C-13 NMR spectra - chemguide

WebC-H signals tend to be sharper, and any C-H signal that integrates for one will have significant splitting. The only way to have a 1H that doesn’t split is for it to be an OH. 3. If you have an OH signal, of course you will also have some C-H signals in the 3’s area. 2. Check each of the zones. WebRun an ordinary (broadband-decoupled) C-13 NMR spectrum of the compound. A signal will appear for each non-equivalent carbon. (Equivalent carbons will all contribute to the same signal.) Step 2 Run a DEPT-90 C-13 NMR of the compound. A signal will appear for each non-equivalent carbon that has one hydrogen attached (CH). No peaks will appear ... hotely cr

NMR Spectroscopy - Michigan State University

WebIn the nmr spectrum of the pure liquid, sharp signals from both the keto and enol tautomers are seen, their mole ratio being 4 : 21 (keto tautomer signals are colored purple). Chemical shift assignments for these signals are shown in the shaded box above the spectrum. http://employees.oneonta.edu/knauerbr/221lects/nmr.pdf Web15.1 Introduction to NMR; 15.2 The Number of Signals in C 13 NMR; 15.3 The Number of Signals in Proton NMR; 15.4 Homotopic vs Enantiotopic vs Diastereotopic; 15.5a The … linda hopgood mediator ky