By Robert B. Bates, William A. Beavers
With the appearance of Fourier rework spectrometers of serious sensitivity, it has develop into useful to procure carbon-13 nuclear magnetic resonance (C-13 NMR; l3C NMR; CMR) spectra regularly on natural molecules, and this system has turn into one of many optimum application in making a choice on buildings of natural unknowns. whilst the standard spectrometric ideas proton magnetic resonance (H-I NMR; IH NMR; PMR), infrared (lR), mass (MS), and ultraviolet (UV)-do no longer comfortably show a compound's constitution, a C-13 NMR spectrum will usually supply adequate additional info to yield it unequivocally. With this in brain, the current paintings used to be designed to provide complicated undergraduates, graduate scholars, and practising chemists a operating wisdom of and facility with using this worthy approach. a few familiarity with different spectrometric strategies is believed (recommended ebook: Silverstein, Bassler, and Morrill, Spectrometric identity of natural Compounds), yet no previous wisdom of C-13 NMR -which is handled very calmly, if in any respect, within the ordinary basic natural texts-is worthy. A dialogue of C-13 NMR spectroscopy is by way of one hundred twenty five difficulties, every one which include 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 an important IR, UV, and MS facts. those difficulties were very conscientiously ready, completely proven through scholars on the collage of Arizona, and we think that only a few error stay.
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Extra resources for Carbon-13 NMR Spectral Problems
0 I Problem 1-16 Carbon-13 NMR Spectral Problems/33 J I ~ = i j ~ i i i ~ ~ m j ~ I ~ j ~ ! 0 .... IL.. 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 .... IL.. 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 ....