Unsaturation nuclear magnetic resonance

Instmmental methods of analysis provide information about the specific composition and purity of the amines. QuaUtative information about the identity of the product (functional groups present) and quantitative analysis (amount of various components such as nitrile, amide, acid, and deterruination of unsaturation) can be obtained by infrared analysis. Gas chromatography (gc), with a Hquid phase of either Apiezon grease or Carbowax, and high performance Hquid chromatography (hplc), using siHca columns and solvent systems such as isooctane, methyl tert-huty ether, tetrahydrofuran, and methanol, are used for quantitative analysis of fatty amine mixtures. Nuclear magnetic resonance spectroscopy (nmr), both proton ( H) and carbon-13 ( C), which can be used for quaHtative and quantitative analysis, is an important method used to analyze fatty amines (8,81). 

Ramirez, F., Madan, O.P., and Heller, S.R., A crystalline tetraalkoxyalkylphos-phorane from the reaction of trimethyl phosphite with an a,JS-unsaturated ketone. 3-Benzylidene-2,4-pentadienone. 31P and H nuclear magnetic resonance spectra, /. Am. Chem. Soc., 87, 731, 1965. 

The determination of the various types of geometric isomers associated with unsaturation in Polymer chains is of great importance, for example, in the study of the structure of modern synthetic rubbers. In table below are listed some of the important infrared absorption bands which arise from olefinic groups. In synthetic "natural" rubber, cis-1, 4-polyisoprene, relatively small amounts of 1, 2 and 3, 4-addition can easily be detected, though it is more difficult to distinguish between the cis and trans-configurations. Nuclear magnetic resonance spectroscopy is also useful for this analysis. 

Its nuclear magnetic resonance spectra were detd by Marvel (Ref 10). Also reactions are reported by Steinberg (Ref 3), and its addn to unsaturated compds by Pudovik ... 

Hydrocarbons may be differentiated by their solubility in sulphuric acid since unsaturated hydrocarbons are soluble in concentrated sulphuric acid as are those arenes which are readily sulphonated, whereas the saturated alkanes and lesser reactive arenes are insoluble in this reagent. The presence of an alkene, alkyne or arene is usually readily apparent from an inspection of the infrared and nuclear magnetic resonance spectra, the characteristic features of which are fully discussed in Sections 5.2., 5.3 and 6.1 respectively and in Chapter 3. 

L.F. Johnson and J.N. Shoolery, Determination of unsaturation and average molecular weight of natural fats by nuclear magnetic resonance, Anal. Chem. 34 (1962) 1136-1139. 

N.F. Chamberlain, Nuclear magnetic resonance chemical shifts of oxygenated unsaturated aliphatics, Anal. Chem. 40 (1968) 1317-1325. 

D. S. Stephenson and G. Binsch, DNMR5 Iterative Nuclear Magnetic Resonance Program for Unsaturated Exchange-Broadened Band Shapes , Institute of Organic Chemistry, University of Munich, Munich FRG (QCPE 365 and 569). 

Information on unsaturated systems is scarce, and only a phenylated (at Se) selenaphosphirenium cation has been observed by nuclear magnetic resonance (NMR) spectroscopy in the presence of a noncoordinating counterion (CE3S03 ), which was transformed to a selenaphosphene with halide counteranions <1997PS23>. The assumed... 

Most of the publications dealing with heterocycles contain nuclear magnetic resonance (NMR) data. While H and NMR data are the most important, NMR data are particularly relevant to boron-containing heterocyles. The H, B, and NMR data of unsaturated, anionic, and transition metal 7t-coordinated rings are useful probes of their electronic structures. 

X Nuclear Magnetic Resonance Features of Unsaturated Sugars.265... 

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