By Robert B. Bates, William A. Beavers
With the appearance of Fourier rework spectrometers of serious sensitivity, it has turn into sensible to procure carbon-13 nuclear magnetic resonance (C-13 NMR; l3C NMR; CMR) spectra often on natural molecules, and this system has develop into one of many optimum software in picking constructions of natural unknowns. whilst the standard spectrometric options proton magnetic resonance (H-I NMR; IH NMR; PMR), infrared (lR), mass (MS), and ultraviolet (UV)-do no longer quite simply demonstrate a compound's constitution, a C-13 NMR spectrum will frequently supply adequate additional info to yield it unequivocally. With this in brain, the current paintings used to be designed to offer complicated undergraduates, graduate scholars, and working towards chemists a operating wisdom of and facility with using this necessary process. a few familiarity with different spectrometric strategies is believed (recommended booklet: Silverstein, Bassler, and Morrill, Spectrometric id of natural Compounds), yet no earlier wisdom of C-13 NMR -which is taken care of very frivolously, if in any respect, within the standard user-friendly natural texts-is important. A dialogue of C-13 NMR spectroscopy is by means of a hundred twenty five difficulties, every one which includes a molecular formulation, kinds of C-13 NMR spectra (partially and entirely proton decoupled, with connecting strains to facilitate multiplicity assignments), an built-in H-I NMR spectrum, and crucial IR, UV, and MS facts. those difficulties were very rigorously ready, completely demonstrated through scholars on the collage of Arizona, and we think that only a few blunders stay.
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Additional info for Carbon-13 NMR Spectral Problems
0 0 Problem 1-17 I ! ~ ~ ~ I i i ~ ~ ~ j ~ _ I ! ~ NMR Spectral Problems/57 i I 90 t ~ j m I ~ I 50 I ~ I m I 20 ! m I o Problem 1-19 38/Bates and Beavers 1-19 MS: C6H6N2O IR: 3350, 3200, 1700, 1630 em -1 UV: PMR: CMR: D0 2 D20 ,L, I m122(s), 106, 78 262 (E 2850) + + DSS; upper sean offset 300 Hz dioxane , 4~ 31 I I 2~ 2E I; ,~ I I , I o H, / i I I I ! 0 \.. ~ .... 0 -~ I' Problem 1-19 I I I 220 I 210 I 200 I 190 , 180 I 170 I~ v 1. 0 I I 30 20 I 10 .... 1 J. j i ! I I I ! i I ~ ~ ~ ~ ~ ~ ~ ~ ~ I I i m ~ 00 6 lit ~ 00 I ~ j ro I I ~ ~ j ~ I ~ j w j ro 1 I 0 42/Bates and Beavers 1-21 MS: C12H1003S IR: Problem 1-21 m234, 141, 93, 77 UV: Strong absorption 5~ , 4~ , 3~ I 2~ l~ I ~ H, 1/ I,J ....
1 J. j i ! I I I ! i I ~ ~ ~ ~ ~ ~ ~ ~ ~ I I i m ~ 00 6 lit ~ 00 I ~ j ro I I ~ ~ j ~ I ~ j w j ro 1 I 0 42/Bates and Beavers 1-21 MS: C12H1003S IR: Problem 1-21 m234, 141, 93, 77 UV: Strong absorption 5~ , 4~ , 3~ I 2~ l~ I ~ H, 1/ I,J .... 0 20 1. 3 NMR Spectral Problems/43 j [ ~ ~ j ro j ~ I ~ I ~ j ~ ! m !
I I I ! i I ~ ~ ~ ~ ~ ~ ~ ~ ~ I I i m ~ 00 6 lit ~ 00 I ~ j ro I I ~ ~ j ~ I ~ j w j ro 1 I 0 42/Bates and Beavers 1-21 MS: C12H1003S IR: Problem 1-21 m234, 141, 93, 77 UV: Strong absorption 5~ , 4~ , 3~ I 2~ l~ I ~ H, 1/ I,J .... 0 20 1. 3 NMR Spectral Problems/43 j [ ~ ~ j ro j ~ I ~ I ~ j ~ ! m !