An Introduction to Spectroscopic Methods for the - download pdf or read online

By F. Scheinmann (Eds.)

ISBN-10: 0080066623

ISBN-13: 9780080066622

ISBN-10: 0080167209

ISBN-13: 9780080167206

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Extra resources for An Introduction to Spectroscopic Methods for the Identification of Organic Compounds. Mass Spectrometry, Ultraviolet Spectroscopy, Electron Spin Resonance Spectroscopy, Nuclear Magnetic Resonance Spectroscopy (Recent Developments), Use of Various Spectral

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R. r. That is, one considers the whole accumulated data, when observations about the type of compound (? aliphatic, aromatic) and functional groups can be made. Starting from an obvious deduction, the basis of which will vary from case to case, confirmation is sought from the remainder of the data, and it usually quickly becomes apparent whether one is thinking on the right lines or not. As some idea of the nature of the compound becomes evident it is a customary and obvious practice to compare spectra of authentic compounds with that of the unknown to confirm that the general fragmentation pattern is applicable to the particular case in hand or to consult the literature for the known ways in which compounds of exactly the same type undergo fragmentation.

Comparing these peak heights. For amines the ratio of abundances of ions NH4JÌNH3ÌS ·+ + high ; if oxygen is present and these ions are due respectively to H2O and OH, then the ratio H2O/OH is much lower. Ions representing the loss of NH3 from the molecular ion are of no importance in amine spectra (compare the loss of H2O and H2S from alcohols and thiols). Cycloalkylamines behave in a manner largely predictable from the foregoing. In addition neutral radicals can be expelled from the ring by scission with rearrangement, as indicated for cyclohexylamine(24 c) [molecular ion (XXI)].

CH 3 CHs-CHaVCH-fCHa-CHr-CHs 29) CHy-CHg-CH-^-CHa 7l\ (XXXVI) (XXXVII) m / e 85 (XXXVIII) m/e 84 (ii) Cyclic Cyclic structures stabilize the molecular ion, and such compounds give more prominent molecular ion peaks than do the open-chain compounds of the same carbon content; fusion of rings increases the effect. Cleavage of the bond connecting the ring to the remain­ der of the molecule is favoured (a-cleavage). Cleavage of the ring bonds also occurs, and the expulsion of one- and two-carbon frag­ ments takes place.

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An Introduction to Spectroscopic Methods for the Identification of Organic Compounds. Mass Spectrometry, Ultraviolet Spectroscopy, Electron Spin Resonance Spectroscopy, Nuclear Magnetic Resonance Spectroscopy (Recent Developments), Use of Various Spectral by F. Scheinmann (Eds.)


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