Solution structures of dimeric methylpyrazolyl and indazolyl dimethyl-derivatives of boron, gallium, and indium from 1H nuclear magnetic resonance data

1979 ◽  
Vol 57 (18) ◽  
pp. 2520-2522 ◽  
Author(s):  
Louis K. Peterson ◽  
Kwat I. Thé
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Single Species ◽  
Structural Isomer ◽  
Solution Structures ◽  
H Nmr ◽  
Magnetic Resonance Data ◽  
Nmr Data ◽  
1H Nuclear Magnetic Resonance ◽  
Resonance Data ◽  
Derivatives Of

Trimethylboron and trimethylgallium react with 3-methylpyrazole to yield isomer pairs of dimeric products [Me2E(Mepz)]2 (E = B, Ga; Mepz = 3-methylpyrazolyl), in the approximate ratios 4:3 (E = B) and 9:1 (E = Ga), while trimethylindium gives a single species. Reactions of indazole with trimethylgallium and trimethylindium also yield a single structural isomer of the dimer [Me2Eind]2 (E = Ga, In; ind = indazolyl). Solution structures were interpreted on the basis of 1H nmr data.

Fluorinated carbohydrates. Part V. Nuclear magnetic resonance data on pyranose and furanose derivatives of 3-deoxy-3-fluoro-D-glucose

1970 ◽  
Vol 48 (24) ◽  
pp. 3937-3945 ◽  
Author(s):  
A. B. Foster ◽  
R. Hems ◽  
L. D. Hall
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Data ◽  
Spectral Parameters ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Derivatives Of ◽  
Glucose Derivatives ◽  
Nuclear Magnetic

The n.m.r. spectra of a series of 3-fluorinated glucose derivatives have been measured; spectral assignments were confirmed by 1H–{19F} heteronuclear decoupling experiments. The 19F spectral parameters illustrate a variety of stereospecific dependencies, the most noteworthy being that of 4JF,H couplings, for which 4Je,e = ca. + 4.0 Hz while 4Je,a = ca. − 1.5 Hz.

scholarly journals Monitoring Key Reactions in Degradation of Chloroaromatics by In Situ 1H Nuclear Magnetic Resonance: Solution Structures of Metabolites Formed from cis-Dienelactone

2002 ◽  
Vol 184 (5) ◽  
pp. 1466-1470 ◽  
Author(s):  
Dietmar H. Pieper ◽  
Katrin Pollmann ◽  
Patricia Nikodem ◽  
Bernardo Gonzalez ◽  
Victor Wray
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Solution Structure ◽  
Solution Structures ◽  
H Nmr ◽  
Enzymatic Transformation ◽  
1H Nuclear Magnetic Resonance ◽  
Resonance Solution ◽  
Dienelactone Hydrolase ◽  
Nuclear Magnetic

ABSTRACT A 1H nuclear magnetic resonance (1H NMR) assay was used to study the enzymatic transformation of cis-dienelactone, a central intermediate in the degradation of chloroaromatics. It was shown that the product of the cis-dienelactone hydrolase reaction is maleylacetate, in which there is no evidence for the formation of 3-hydroxymuconate. Under acidic conditions, the product structure was 4-carboxymethyl-4-hydroxybut-2-en-4-olide. Maleylacetate was transformed by maleylacetate reductase into 3-oxoadipate, a reaction competing with spontaneous decarboxylation into cis-acetylacrylate. One-dimensional 1H NMR in 1H2O could thus be shown to be an excellent noninvasive tool for monitoring enzyme activities and assessing the solution structure of substrates and products.

Carbon-13 nuclear magnetic resonance study of phenyl derivatives of B, Si, Sn, P, and Te fluorides

1993 ◽  
Vol 71 (4) ◽  
pp. 526-528 ◽  
Author(s):  
Chengrui Wang ◽  
Yuxiang Mo ◽  
Meehae Jang ◽  
Alexander F. Janzen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Central Element ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Experimental Values ◽  
Derivatives Of ◽  
Nuclear Magnetic

13C nuclear magnetic resonance data for a variety of phenyl derivatives of boron, silicon, tin, phosphorus, and tellurium fluorides are presented. Neutral, anionic, and cationic complexes are included and the coordination number of the central element varies from 3 to 6. Empirical equations of the 13C chemical shifts of the benzene ring have been deduced by taking into consideration the charge density, dipole moment, and binding energy, and the 13C chemical shifts calculated from these equations deviate from the experimental values by up to 1.4 ppm, but mostly less than 0.7 ppm.

NEW REARRANGEMENTS OF THE CARYOPHYLLENE SKELETON: THE DINITROPHENYLHYDRAZONES FROM CARYOPHYLLENE OXIDE

1964 ◽  
Vol 42 (7) ◽  
pp. 1664-1675 ◽  
Author(s):  
E. W. Warnhoff
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Data ◽  
Chemical Data ◽  
Caryophyllene Oxide ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Derivatives Of ◽  
Nuclear Magnetic

Caryophyllene oxide (I) and dihydrocaryophyllene oxide (II) have been found to give 2,4-dinitrophenylhydrazones. Structures IV, V, and VII are assigned to three of these compounds on the basis of nuclear magnetic resonance data, other spectral and chemical data, and mechanistic considerations. Structure VII is the product of a new cyclization–rearrangement of the caryophyllene system. The dinitrophenylhydrazone previously obtained from isocaryophyllene oxide-a (III) is probably identical with VII. Three other new derivatives of caryophyllene are described, one of which (VI) is an intermediate in the conversion of I to VII.

Methods to Determine Phytopharmaceuticals in Tobacco and Tobacco Products. 4th Report: A Procedure to Determine Vamidothion and its Metabolites/Methoden zur Bestimmung von Phytopharmaka in Tabak und Tabakerzeugnissen: IV. Mitteilung: Ein Bestimmungsverfahren fuer Vamidothion und seine Metaboliten

1977 ◽  
Vol 9 (2) ◽  
Author(s):  
A.N. Sagredos ◽  
R. Moser
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Acetic Acid ◽  
Magnetic Resonance ◽  
Aluminium Oxide ◽  
Nuclear Magnetic Resonance Data ◽  
Gas Chromatograph ◽  
Tobacco Products ◽  
Magnetic Resonance Data ◽  
Resonance Data

AbstractBased on previous work (7) a method to simultaneously determine vamidothion [I], vamidothion-sulfoxide [II] and vamidothion sulfone [III] in tobacco has been developed. The compounds are extracted with water/acetone/acetic acid from the tobacco, cleansed over an aluminium oxide column and then determined on the gas chromatograph with the specific sulphur detector. Rates of recovery are 70 % - 92 %, the determination level is 0.1 ppm. Mass spectrometry and nuclear magnetic resonance data of vamidothion [I], vamidothion-sulfoxide [ II ] and vamidothion-sulfone [III] are given.

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