By Robert B. Bates, William A. Beavers
With the appearance of Fourier remodel spectrometers of significant sensitivity, it has develop into sensible to acquire carbon-13 nuclear magnetic resonance (C-13 NMR; l3C NMR; CMR) spectra regularly on natural molecules, and this method has develop into one of many maximum software in selecting constructions of natural unknowns. while the standard spectrometric ideas proton magnetic resonance (H-I NMR; IH NMR; PMR), infrared (lR), mass (MS), and ultraviolet (UV)-do now not conveniently display a compound's constitution, a C-13 NMR spectrum will usually supply adequate more information to yield it unequivocally. With this in brain, the current paintings was once designed to provide complicated undergraduates, graduate scholars, and practising chemists a operating wisdom of and facility with using this necessary procedure. a few familiarity with different spectrometric recommendations is thought (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 evenly, if in any respect, within the commonplace simple natural texts-is useful. A dialogue of C-13 NMR spectroscopy is via one hundred twenty five difficulties, every one including a molecular formulation, varieties of C-13 NMR spectra (partially and entirely proton decoupled, with connecting traces to facilitate multiplicity assignments), an built-in H-I NMR spectrum, and crucial IR, UV, and MS facts. those difficulties were very conscientiously ready, completely proven by way of scholars on the collage of Arizona, and we think that only a few mistakes stay.
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Extra info for Carbon-13 NMR Spectral Problems
0 I J0 Problem 1-14 carbon-13 NMR Spectral Problems/29 1l I ~ i W \ ~ i i i ~ ~ w _i _! 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 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 .... 0 20 1. 3 NMR Spectral Problems/43 j [ ~ ~ j ro j ~ I ~ I ~ j ~ ! m !
I'! ~ ~ tit ~ ~ ~ i' ~ i ~ 't 00 i i i ~ m 6 ~ 1 ~ j ~ i ro j ~ I ~ j ~ I ~ [ ~ ! 0 I J0 Problem 1-14 carbon-13 NMR Spectral Problems/29 1l I ~ i W \ ~ i i i ~ ~ w _i _! 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 !