Nuclear magnetic resonance dipolar

Wong, C.-R, Venteicher, R.F., and Horrocks, WD. Jr (1974) Lanthanide porphyrin complexes. Potential new class of nuclear magnetic resonance dipolar probe. Journal of the American Chemical Society, 96, 7149. 

Hansen, M. R., Hanson, R, and Rardi, A. (2000). Eilamentous bacteriophage for aligning RNA, DNA, and proteins for measurement of nuclear magnetic resonance dipolar coupling interactions. Methods EnzymoL, 317, 220-240. 

Horrocks, W., De, W. Wong, C. P (1976). Lantanide porphyrin complexes evaluation of nuclear magnetic resonance dipolar probe and shift reagent capabilities. J. Am. Chem. Soc, 98(23), 7157-7162. 

X. and Du, J. (2012) Quantum factorization of 143 on a dipolar-coupling nuclear magnetic resonance system. 

Andrew, E.R., Bradbury, A., and Eades, R.G. (1959) Removal of dipolar broadening of nuclear magnetic resonance spectra of solids by specimen rotation. Nature, 183, 1802. 

Currently, there are no accurate methods available for quantifying the aliphatic bridges in the coal macromolecule. Quantitative nature of the application of infrared (IR) spectroscopy is limited to certain general types of functional groups or bond types. Nuclear magnetic resonance spectroscopy, despite the success of dipolar dephasing techniques to decipher the extent of substitution on carbon atoms, is still inadequate to distinguish distinct structural entities . 

Nuclear magnetic resonance (NMR) spectroscopic studies (1H, 13C, and 31P), are consistent with the dipolar ylide structure and suggest only a minor contribution from the ylene structure.135 Theoretical calculations support this view, also.136... 

As part of a mechanistic and synthetic study of nucleophihc carbenes the spirocyclic 4(5/l)-oxazolone 18 has been obtained from benzoyl isocyanate (Scheme 6.1) Thermal extrusion of nitrogen from the 1,3,4-oxadiazoline 14 produced the carbonyl ylide 15 that fragmented via loss of acetone to the aminooxycarbene 16. Spectroscopic data [gas chromatography-mass spectrometry (GC-MS), infrared (IR), proton and C-13 nuclear magnetic resonance ( H and NMR)] of the crude thermolysate was consistent with 18. The formation of 18 was rationalized to result from nucleophihc addition of 16 to benzoyl isocyanate followed by cyclization of the dipolar intermediate 17. Thermolysis of 19 and 21 under similar reaction conditions afforded 20 and 22 respectively, also identified spectroscopically as the major products in the thermolysate. 

Hatcher, P.H. (1987) Chemical structural studies of natural lignin by dipolar dephasing solid state 13C nuclear magnetic resonance. Org. Geochem. 11, 31-39. 

The previous three chapters have shown that nuclear magnetic resonance experiments with 1H and 13C nuclei are enormously useful to the chemist working with organic compounds. There is no need, however, to limit ourselves to these two important nuclei. Indeed, there are 120 different nuclei whose spin number, /, is greater than zero and, therefore, theoretically observable in an NMR experiment. Of these 120 nuclei, 31 of them are dipolar, which means that their spin number is one-half (/ = ). 

Gerstein BC, Dybowski CR (1985) Transient techniques in NMR of solids an introduction to theory and practice Academic Press, Orlando, 295 pp Hatcher PG (1987) Chemical structural studies of natural lignin by dipolar dephased solid-state nC nuclear magnetic resonance Org Geochem 11 31-39 Hatfield GR, Maciel GE, Erbatur O, Erbatur G (1987) Qualitative and quantitative analysis of solid lignin samples by carbon-13 nuclear magnetic resonance spectrometry Anal Chem 59 172-179... 

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