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Carbon-13 NMR Spectral Problems by Robert B. Bates, William A. Beavers

By Robert B. Bates, William A. Beavers

With the arrival of Fourier remodel spectrometers of significant sensitivity, it has develop into sensible to procure carbon-13 nuclear magnetic resonance (C-13 NMR; l3C NMR; CMR) spectra oftentimes on natural molecules, and this system has turn into one of many optimum application in settling on constructions 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 now not without problems display a compound's constitution, a C-13 NMR spectrum will frequently supply enough more information to yield it unequivocally. With this in brain, the current paintings was once designed to offer complex undergraduates, graduate scholars, and working towards chemists a operating wisdom of and facility with using this useful approach. a few familiarity with different spectrometric thoughts is thought (recommended e-book: Silverstein, Bassler, and Morrill, Spectrometric identity of natural Compounds), yet no earlier wisdom of C-13 NMR -which is taken care of very calmly, if in any respect, within the well-known undemanding natural texts-is beneficial. A dialogue of C-13 NMR spectroscopy is by way of one hundred twenty five difficulties, each one along with 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 rigorously ready, completely confirmed by way of scholars on the collage of Arizona, and we think that only a few mistakes stay.

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0 i Problem 1-13 Carbon-13 NMR Spectral Problems/27 s I ~ ! ~ 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 !

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 ....

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.

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