Phenolics Nuclear Magnetic Resonance spectroscopy

ASTM Test Method D5292, Aromatic Carbon Contents of Hydrocarbon Oils by High Resolution Nuclear Magnetic Resonance Spectroscopy, permits determination of aromatic hydrogen and aromatic carbon content of gas oils, lubricating oils, and other hydrocarbon fractions that are completely soluble in chloroform and carbon tetrachloride at ambient temperatures. Concentrations as low as 0.1 mol-% hydrogen and 0.5 mol-% carbon can be determined. Olefins and phenolic compounds above 1 mass-% interfere. 

At VirginiaTech, 3,3 -disulfonate, 4,4 -dichlorodiphenylsulfone co-monomers with varying degrees of sulfonation were prepared from commercially available monomers. Nuclear magnetic resonance (NMR) spectroscopy was conducted on selected polymeric films to investigate the level of sulfonation. The NMR results showed that the sulfonation levels could be quantified very accurately. The water uptake of bi-phenol sulfone (BPSH) films increased with an increase in the degree of sulfonation. The membrane samples drawn from BPSH40 with 20, 30 and 40 K molecular... 

Chapters 7 through 10 cover oxygen functionality in order of the increasing oxidation state of carbon—alcohols and phenols, ethers and epoxides, aldehydes and ketones, and acids and their derivatives. Brief mention of sulfur analogs is made in these chapters. Chapter 11 deals with amines. Chapters 2 through 11 treat every main functional group and constitute the heart of the course. Chapter 12 then takes up spectroscopy, with an emphasis on nuclear magnetic resonance (NMR) and applications to structure determination. This chapter handles the students question How do you know that those molecules really have the structures you say they have ... 

In addition to analytical separations, the identification of phenolic acids has greatly benefited from the development of modem techniques (infrared [IR] and nuclear magnetic resonance [NMR] spectroscopy, mass spectrometry, etc.), that have added to the accurate knowledge of the stmcture of natural phenolic molecules [7]. New analytical approaches, including Raman spectroscopy, also... 

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