By L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)
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Additional resources for Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry
A) It must be chemically inert to a high degree. (b) It must be magnetically isotropic or nearly so. (c) It should give a single, sharp, and readily recognizable absorption signal. (d) It should be readily miscible with a wide variety of solvents and other organic liquids. (e) It should be relatively volatile in order to facilitate the recovery of valuable sample material. T A B L E 1 - 2 - 1 . A COMPARISON OF I N T E R N A L REFERENCE C O M P O U N D S Reference Line position of the aromatic protons of ethylbenzene ( H z from tetramethylsilane at 4 0 M H z ) Chloroform Methylenedichloride Dioxane Cyclohexane Tetramethylsilane Tetramethylsilane f + External reference 325-5 317-5 290-5 281-5 282-0 284-5 284-4 t A d d e d to a 10 per cent solution of ethylbenzene in C C 1 4.
Is principally a spectroscopic method which, like infrared and ultraviolet spectroscopy, provides us with numbers characteristic of atoms and their arrangements in complex molecules. r. spectroscopy for quantitative analysis in organic chemistry. A. R. SPECTROMETER The apparatus consists essentially of four parts: (i) a magnet capable of producing a very strong homogeneous field; (ii) a means of continuously varying either the magnetic field or frequency over a very small range ; (iii) a radiofrequency oscillator; (iv) a radiofrequency receiver.
Linearly polarized radiofrequency radiation is precisely that generally used in radio communication. f. oscillator) capable of generating a signal of constant frequency, the power of which can be varied if necessary. This signal is fed to a coil situated in the pole gap of the magnet and wound with its axis perpendicular to the direction of the magnetic field. Such an arrangement produces a magnetic component of the electromagnetic field rotating in a plane at right angles to the main field direction.
Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry by L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)