Download e-book for iPad: Structure Determination of Organic Compounds: Tables of by E. Pretsch, P. Bühlmann, C. Affolter

By E. Pretsch, P. Bühlmann, C. Affolter

ISBN-10: 3540678158

ISBN-13: 9783540678151

This quantity provides within the type of texts, tables, charts and graphs a latest compilation of spectroscopic reference info for IR, UV/Vis, 1H- and 13C-NMR, MS (incl. prototype spectra of just about each vital category of natural compounds and spectra of MALDI and FAB matrix fabrics) and is meant as a quick textbook and a hands-on consultant for examining experimental spectral info and elucidating the chemical constitution of the respective compound in the back of it. The concise texts contain precise chapters on fragmentation principles in mass spectrometry and on presently used multipulse and 2-D NMR innovations. The booklet is essentially designed for college students for use in the course of classes and workouts. using the e-book calls for merely easy wisdom of spectroscopic ideas, yet is dependent in this sort of manner that it'll help practitioners generally confronted with the duty of examining such spectral details, and it'll function info reference for experts within the fields

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Extra resources for Structure Determination of Organic Compounds: Tables of Spectral Data

Sample text

Taylor, Isotopic compositions of the elements 1997, Pure Appl. Chem. 1998, 70, 217. H. Kubinyi, Calculation of isotope distributions in mass spectrometry. A trivial solution for a non-trivial problem, Anal. Chim. Acta 1991, 247, 107. 8 ppm 3000-2840 cm-l ~ 1 4 6 cm-l 0 ~ 1 4 6 cm-l 0 ~ 1 3 8 cm-l 0 770-720 cm-l Molecular ion m/z 14n + 2 Fragments Rearrangements m/z 14n m/z 14n - 2 Comments CH3, CH2, CH, and C can be differentiated by 13C NMR multipulse experiments (DEPT, APT), offresonance decoupling, 2D CH correlation spectra, or based on relaxation times Lower shift values in three-membered rings 1H NMR Lower shift values in three-membered rings Higher frequency in three-membered rings IR Doublet for geminal methyl groups In C-(CH*),-C with n 2 4 at ca.

In the presence of other elements, M+' becomes an odd number unless the elements are present in an even number (this holds for N, 13C, 2H). M+' can only form fragment ions of masses that differ from that of the molecular ion by chemically logical values (Am). In this context, chemically illogical differences are Am = 3 (in the absence of Am = 1) to Am = 14, Am = 21 (in the absence of Am = 1) to Am = 24, Am = 37, 38 and all Am less than the mass of an element of characteristic isotope pattern in cases where the same isotope pattern is not retained in the fragment ion.

The use of A(mix mil) allows to determine the values of r, s, t,. simply by expanding the general polynomial. A numerical value for A, which has no intristic meaning, is never needed. For example, for CBr2C12, the above equation gives rise to the following expression: For sufficient resolution, (mix - mil) and (mjx - mjl) differ from one another. This results in very complex isotope patterns even for very small molecules. Thus, owing to the occurrence of 12C, 13C, 79Br, 81Br, 35Cl, and 37Cl, there are 18 signals for CBr2Clz.

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Structure Determination of Organic Compounds: Tables of Spectral Data by E. Pretsch, P. Bühlmann, C. Affolter

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