A two-dimensional proton NMR investigation of the ring A conformation in 3-keto triterpenoids: observation of an unusually large vicinal coupling constant

D. Loganathan; G. K. Trivedi; K. V. R. Chari

doi:10.1021/jo00367a022

A two-dimensional proton NMR investigation of the ring A conformation in 3-keto triterpenoids: observation of an unusually large vicinal coupling constant

The Journal of Organic Chemistry ◽

10.1021/jo00367a022 ◽

1986 ◽

Vol 51 (17) ◽

pp. 3366-3369 ◽

Cited By ~ 9

Author(s):

D. Loganathan ◽

G. K. Trivedi ◽

K. V. R. Chari

Keyword(s):

Proton Nmr ◽

Two Dimensional ◽

Coupling Constant ◽

Vicinal Coupling Constant

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ChemInform Abstract: A Two-Dimensional 1H-NMR Investigation of the Ring A Conformation in 3-Keto Triterpenoids: Observation of an Unusually Large Vicinal Coupling Constant.

ChemInform ◽

10.1002/chin.198708064 ◽

1987 ◽

Vol 18 (8) ◽

Author(s):

D. LOGANATHAN ◽

G. K. TRIVEDI ◽

K. V. R. CHARI

Keyword(s):

1H Nmr ◽

Two Dimensional ◽

Coupling Constant ◽

Vicinal Coupling Constant

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Sequence-specific proton NMR assignment and secondary structure of the Arc repressor of bacteriophage P22, as determined by two-dimensional proton NMR spectroscopy

Biochemistry ◽

10.1021/bi00451a042 ◽

1989 ◽

Vol 28 (25) ◽

pp. 9826-9833 ◽

Cited By ~ 30

Author(s):

J. N. Breg ◽

R. Boelens ◽

A. V. E. George ◽

R. Kaptein

Keyword(s):

Nmr Spectroscopy ◽

Secondary Structure ◽

Nmr Assignment ◽

Proton Nmr ◽

Two Dimensional ◽

Proton Nmr Spectroscopy ◽

Bacteriophage P22 ◽

Arc Repressor

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A two-dimensional NMR method for assignment of deoxyribose proton NMR signals in d(ApGpCpT)

Biochemical and Biophysical Research Communications ◽

10.1016/0006-291x(84)90779-4 ◽

1984 ◽

Vol 121 (3) ◽

pp. 1021-1026 ◽

Cited By ~ 23

Author(s):

Kofen Lai ◽

Dinesh O. Shah ◽

Eugene DeRose ◽

David G. Gorenstein

Keyword(s):

Proton Nmr ◽

Two Dimensional ◽

Nmr Method ◽

Nmr Signals

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One- and two-dimensional proton NMR, fluorescence and molecular modeling studies on the tomaymycin-d(ATGCAT)2 adduct. Evidence for two covalent adducts with opposite orientations and stereochemistries at the covalent linkage site

Journal of Medicinal Chemistry ◽

10.1021/jm00398a016 ◽

1988 ◽

Vol 31 (3) ◽

pp. 583-590 ◽

Cited By ~ 24

Author(s):

Steve Cheatham ◽

Alan Kook ◽

Laurence H. Hurley ◽

Mary D. Barkley ◽

William Remers

Keyword(s):

Molecular Modeling ◽

Proton Nmr ◽

Two Dimensional ◽

Covalent Linkage ◽

Modeling Studies ◽

Molecular Modeling Studies ◽

Covalent Adducts

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Improved Cross Peak Detection in Two-Dimensional Proton NMR Spectra Using Excitation Sculpting

Journal of Magnetic Resonance ◽

10.1006/jmre.1998.1404 ◽

1998 ◽

Vol 132 (1) ◽

pp. 154-158 ◽

Cited By ~ 16

Author(s):

Que N. Van ◽

A.J. Shaka

Keyword(s):

Nmr Spectra ◽

Proton Nmr ◽

Peak Detection ◽

Cross Peak ◽

Two Dimensional ◽

Excitation Sculpting

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ChemInform Abstract: NUCLEAR OVERHAUSER EFFECT MEASUREMENTS INVOLVING THE IMINO PROTONS OF YEAST TRNAPHE USING TWO-DIMENSIONAL PROTON NMR SPECTROSCOPY

Chemischer Informationsdienst ◽

10.1002/chin.198346048 ◽

1983 ◽

Vol 14 (46) ◽

Author(s):

C. A. G. HAASNOOT ◽

A. HEERSCHAP ◽

C. W. HILBERS

Keyword(s):

Nmr Spectroscopy ◽

Nuclear Overhauser Effect ◽

Proton Nmr ◽

Two Dimensional ◽

Proton Nmr Spectroscopy ◽

Overhauser Effect ◽

Nuclear Overhauser

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Analyses of the complex proton NMR spectra: Determination of anisotropic proton chemical shifts of oriented molecules by a two dimensional experiment

Journal of Magnetic Resonance ◽

10.1016/j.jmr.2006.12.016 ◽

2007 ◽

Vol 185 (2) ◽

pp. 240-246 ◽

Cited By ~ 6

Author(s):

Raghav G. Mavinkurve ◽

H.S. Vinay Deepak ◽

K.V. Ramanathan ◽

N. Suryaprakash

Keyword(s):

Nmr Spectra ◽

Chemical Shifts ◽

Proton Nmr ◽

Two Dimensional ◽

Oriented Molecules ◽

Proton Chemical Shifts

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ChemInform Abstract: STUDY OF A CYCLOMETALATED COMPLEX OF RUTHENIUM BY 400-MHZ TWO-DIMENSIONAL PROTON NMR

Chemischer Informationsdienst ◽

10.1002/chin.198532042 ◽

1985 ◽

Vol 16 (32) ◽

Author(s):

P. REVECO ◽

J. H. MEDLEY ◽

A. R. GARBER ◽

N. S. BHACCA ◽

J. SELBIN

Keyword(s):

Proton Nmr ◽

Two Dimensional ◽

Cyclometalated Complex

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High-resolution proton NMR studies of gangliosides. 1. Use of homonuclear two-dimensional spin-echo J-correlated spectroscopy for determination of residue composition and anomeric configurations

Biochemistry ◽

10.1021/bi00280a014 ◽

1983 ◽

Vol 22 (11) ◽

pp. 2676-2687 ◽

Cited By ~ 172

Author(s):

Theodore A. W. Koerner ◽

James H. Prestegard ◽

Peter C. Demou ◽

Robert K. Yu

Keyword(s):

High Resolution ◽

Spin Echo ◽

Proton Nmr ◽

Two Dimensional ◽

Nmr Studies ◽

Residue Composition

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Two-Dimensional Nutation NQR Broad-Line Spectra in Oriented Samples

Zeitschrift für Naturforschung A ◽

10.1515/zna-2006-0908 ◽

2006 ◽

Vol 61 (9) ◽

pp. 499-504 ◽

Cited By ~ 3

Author(s):

Nicolay Sinyavsky ◽

Irina Korneva ◽

Michał Ostafin ◽

Bolesław Nogaj ◽

Mariusz Maćkowiak

Keyword(s):

Asymmetry Parameter ◽

Disordered Systems ◽

Quadrupole Coupling Constant ◽

Two Dimensional ◽

Coupling Constant ◽

Nuclear Spins ◽

Radio Frequency Field ◽

Quadrupole Coupling ◽

Oriented Samples ◽

Constant E

The NQR nutation method to determine the electric field gradient asymmetry parameter η in systems, where the resonance line is so broad that the radio frequency field can excite only a portion of the nuclear spins, is presented. In this situation, the recently developed spectroscopic methods are not applicable. Two-dimensional nutation NQR spectra of oriented powders are calculated and used to determine η at particular frequencies along a broad NQR line. The proposed method is useful for single crystals, oriented powders, glasses, and disordered systems even for small values of the asymmetry parameter. Therefore it can be used to evaluate fluctuations in η and the quadrupole coupling constant e2qQ due to inhomogeneities. We demonstrate the application of this method to oriented chalcogenide semiconducting glasses.

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