Nuclear magnetic resonance spectroscopy nitriles

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). 

Extrusion processing of polyamide-6 (PA6) with aciylonitrile butadiene rubber (NBR) of different nitrile contents, and at elevated temperatures resulted in graft copolymerisation between the two components. Improvement of the impact strength of the PA6 was at a maximum with approximately 10 percent addition of NBR and blends were soluble in formic acid. Products were characterised using infrared and nuclear magnetic resonance spectroscopy, differential thermal analysis and mechanical properties. 16 refs. 

An unusual method for the preparation of syndiotactic polybutadiene was reported by The Goodyear Tire Rubber Co. (43) a preformed cobalt-type catalyst prepared under anhydrous conditions was found to polymerize 1,3-butadiene in an emulsion-type recipe to give syndiotactic polybutadienes of various melting points (120—190°C). These polymers were characterized by infrared spectroscopy and nuclear magnetic resonance (44—46). Both the Ube Industries catalyst mentioned previously and the Goodyear catalyst were further modified to control the molecular weight and melting point of syndio-polybutadiene by the addition of various modifiers such as alcohols, nitriles, aldehydes, ketones, ethers, and cyano compounds. 

In the Raman spectrum, v (C=N) is always intense and evident, but in the IR the intensity is occasionally very low. Nitriles are generally difficult to recognize by nuclear magnetic resonance (NMR). Raman is the most dependable technique. (S. K. Freeman, Applications of Raman Spectroscopy, p. 73.)... 

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