Acyl derivatives of Hydroxylamine. XIII. Configuration and conformation of hydroxamic acid derivatives containing sulfur

1968 ◽  
Vol 46 (11) ◽  
pp. 1873-1880 ◽  
Author(s):  
O. Exner ◽  
M. H. Benn ◽  
Frances Willis
Keyword(s):  
Magnetic Resonance ◽  
Hydroxamic Acid ◽  
Proton Magnetic Resonance ◽  
Dipole Moments ◽  
Electronic Nature ◽  
Graphical Comparison ◽  
Derivatives Of ◽  
Configuration And Conformation ◽  
Acyl Derivatives ◽  
Hydroxamic Acid Derivatives

The configurations and conformations of S-methyl benzothiohydroxamic acid (3) and its S-oxo and S,S-dioxo derivatives (5) and (7) were established by means of a graphical comparison of their dipole moments with those of the corresponding p-nitro compounds.The proton magnetic resonance and infrared spectra of these compounds were also studied.It is concluded that the relative stability of stereoisomers in the series of compounds C6H5C(NOH)X seems to depend more on the electronic nature of the group X than on its steric requirements.

Analysis of the lipopolysaccharide of Pseudomonas maltophilia 555

1987 ◽  
Vol 65 (11) ◽  
pp. 968-977 ◽  
Author(s):  
Jose L. Di Fabio ◽  
Malcolm B. Perry ◽  
David R. Bundle
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Brucella Species ◽  
Pseudomonas Maltophilia ◽  
Structure Formula ◽  
Derivatives Of ◽  
Acyl Derivatives

The phenol phase soluble lipopolysaccharide of Pseudomonas maltophilia strain 555, obtained from cells by the hot aqueous phenol method, was of the smooth type. Sodium dodecyl sulfate – polyacrylamide gel electrophoresis, hydrolysis, methylation, and 13C and 1H nuclear magnetic resonance analyses showed that this lipopolysaccharide has an O-chain polysaccharide composed of a repeating pentasaccharide unit, containing D-rhamnose (D-Rha, one part), 3-acetamido-3,6-dideoxy-D-galactose (D-Fuc3NAc, one part), and 4-acetamido-4,6-dideoxy-D-mannose (D-Rha4NAc, three parts) and having the structure[Formula: see text]The serological cross-reactions between P. maltophilia 555 and Brucella species can now be related to the occurrence of N-acyl derivatives of 4-amino-4,6-dideoxy-D-mannopyranosyl residues in the O-chains of their respective lipopolysaccharide components.

The conformational preference and barrier to internal rotation of an equatorial 3,5-dichlorophenyl group by the J method. Derivatives of cyclohexane, 1,3-dithiane, 1,3-dioxane, and 1,3-dioxolane

1979 ◽  
Vol 57 (3) ◽  
pp. 355-359 ◽  
Author(s):  
Ted Schaefer ◽  
Walter Niemczura ◽  
Werner Danchura
Keyword(s):  
Magnetic Resonance ◽  
Molecular Mechanics ◽  
Internal Rotation ◽  
Phenyl Ring ◽  
Proton Magnetic Resonance ◽  
Conformational Preference ◽  
Molecular Mechanics Calculations ◽  
X Ray ◽  
Carbon Carbon Bond ◽  
Derivatives Of

We report the preparation and the analysis of the phenyl ring proton magnetic resonance spectra of 3,5-dichlorophenylcyclohexane and of the 2-(3,5-dichlorophenyl) derivatives of 1,3-dioxane, 1,3-dithiane, and 1,3-dioxolane. With the exception of the dioxolanes these compounds exist predominantly as the equatorial isomers. The J method is used to show that the phenyl moiety prefers the conformation in which the α C—H bond lies in the phenyl plane. The predominantly twofold barriers to rotation about the carbon–carbon bond between the two ring systems are 2.0 ± 0.3, 0.4 ± 0.2, 2.2 ± 0.3, 0.85 ± 0.3 kcal/mol for these compounds, in the order given above. The low value for the barrier in the 1,3-dioxane derivative agrees reasonably well with molecular mechanics calculations and with the results of calorimetric and X-ray studies on equatorial 2-phenyl-1,3-dioxane.

ChemInform Abstract: PROTON MAGNETIC RESONANCE SPECTRA OF ANIONIC Σ-COMPLEXES OF TRINITROBENZENE WITH CYCLOPENTADIENYL AND INDENYL DERIVATIVES OF TIN

1976 ◽  
Vol 7 (50) ◽  
pp. no-no
Author(s):  
YU. A. USTYNYUK ◽  
G. A. ARTAMKINA ◽  
YU. N. LUZIKOV ◽  
YU. K. GRISHIN ◽  
A. A. AZIZOV ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Derivatives Of ◽  
Magnetic Resonance Spectra

ChemInform Abstract: New Hydroxamic Acid Derivatives of Fluoroquinolones: Synthesis and Evaluation of Antibacterial and Anticancer Properties.

ChemInform ◽  
2014 ◽  
Vol 45 (27) ◽  
pp. no-no
Author(s):  
Gavara Govinda Rajulu ◽  
Halehatty Seephya Bhojya Naik ◽  
Abhilash Viswanadhan ◽  
Jayaraman Thiruvengadam ◽  
Kondodiyil Rajesh ◽  
...  
Keyword(s):  
Hydroxamic Acid ◽  
Anticancer Properties ◽  
Derivatives Of ◽  
Hydroxamic Acid Derivatives
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