Notizen: Reaction Product of Formaldehyd and O-Benzylhydroxylamine: A Schiff Base?

1984 ◽  
Vol 39 (8) ◽  
pp. 1154-1155 ◽  
Author(s):  
Johannes Respondek
Keyword(s):  
Schiff Base ◽  
Structure Elucidation ◽  
Nmr Spectra ◽  
C Nmr

Abstract200 MHz 1H and 50 MHz 13C NMR spectra were recorded from the reaction product of form aldehyd 1 and O -benyzlhydroxylamine 2 for the purpose of its structure elucidation

Stoffwechselprodukte von Mikroorganismen, XXIX [1] 13C-NMR-Spektren hochsubstituierter Naturstoffe vom Phthalid-Typ / Investigations on Metabolites of Microorganisms, XXIX [1] 13C NMR Spectra of Highly Substituted Natural Products of the Phthalide Type

1985 ◽  
Vol 40 (3) ◽  
pp. 426-428 ◽  
Author(s):  
Hans Achenbach ◽  
Andreas Mühlenfeld ◽  
Dieter Hunkler
Keyword(s):  
Natural Products ◽  
13C Nmr ◽  
Structure Elucidation ◽  
Nmr Spectra ◽  
13C Nmr Spectra ◽  
Substituted Benzenes ◽  
C Nmr

Since the usual 13C shift increments are not applicable for very highly substituted benzenes, the 13C NMR spectra of 3-O-ethyl-cyclopolic acid (1) and 2 were studied and fully analyzed. These results were essential for the structure elucidation of a number of new highly substituted phthalides recently isolated from cultures of Aspergillus duricaulis [3].

Microwave-assisted synthesis and antibacterial and pesticidal activity studies of aluminum(III) and gallium(III) complexes with a bioactive Schiff base

2011 ◽  
Vol 34 (5-6) ◽  
pp. 147-152
Author(s):  
Nirmala Singh ◽  
Shobha Rastogi ◽  
R.V. Singh
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Schiff Base ◽  
Nmr Spectra ◽  
Free Ligand ◽  
Azomethine Nitrogen ◽  
Microwave Assisted Synthesis ◽  
Pathogenic Microorganisms ◽  
Microwave Assisted ◽  
C Nmr

Abstract Biologically potent complexes of aluminum(III) and gallium(III) derived from semicarbazone of 3-acetylcoumarin have been synthesized under microwave irradiation and investigated using a combination of microanalytical analysis, melting point, ultraviolet spectra, infrared spectra, 1H nuclear magnetic resonance (NMR) spectra, and 13C NMR spectra. Aluminum and gallium isopropoxides interact with the ligand, resulting in the formation of colored products. Based on conductance and spectral evidences, a five-coordinated structure for aluminum(III) and gallium(III) complexes has been assigned for 1:1 ratio and a six-coordinated structure for 1:2 and 1:3 ratios. The ligand is coordinated to the aluminum(III) and gallium(III) via the azomethine nitrogen atom and the enolic oxygen atom. The free ligand and its metal complexes have been tested in vitro against a number of pathogenic microorganisms in order to assess their antimicrobial and pesticidal properties. Both the ligand and its complexes were found to possess appreciable bactericidal and pesticidal properties.

scholarly journals Synthesis, Spectral and Thermal Behavior of Some New Four Coordinated Complexes

2012 ◽  
Vol 9 (4) ◽  
pp. 2483-2492 ◽  
Author(s):  
M. Montazerozohori ◽  
S. Khani ◽  
S. Joohari ◽  
S. A. Musavi
Keyword(s):  
Thermal Analysis ◽  
Weight Loss ◽  
Schiff Base ◽  
Thermal Behavior ◽  
Thermodynamic Parameters ◽  
Nmr Spectra ◽  
Molar Conductivity ◽  
Conductivity Measurements ◽  
Ft Ir ◽  
C Nmr

A new symmetric bidentate Schiff baseN, N′bis(4-fluorobenzal-dehydene)-1,2-diaminoethane(L) and its complexes with general formula MLX2(M= Zn(II), Cd(II) and Hg(II) and X=chloride, bromide, iodide, thiocyanate and azide) have been prepared. The ligand and complexes have been established by microanalysis, electronic, FT-IR,1H and13C NMR spectra, and by molar conductivity measurements. All compounds are non-electrolytes in chloroform or DMSO-d6. The thermal behavior of the complexes shows weight loss by decomposition of the anions and ligand segments in the subsequent steps. Some activation thermodynamic parameters such as E*, ∆H*, ∆S* and ∆G* were calculated from thermal analysis.

scholarly journals A New Monodesmosidic Triterpenoid Saponin from the Leaves of Pometia Pinnata

2012 ◽  
Vol 7 (11) ◽  
pp. 1934578X1200701 ◽  
Author(s):  
Faryal Vali Mohammad ◽  
Mushtaq Noorwala ◽  
Viqar Uddin Ahmad ◽  
Aqib Zahoor ◽  
HJ. Nordin
Keyword(s):  
Structure Elucidation ◽  
Nmr Spectra ◽  
2D Nmr ◽  
Triterpenoid Saponin ◽  
Phytochemical Investigation ◽  
Nmr Techniques ◽  
C Nmr

Phytochemical investigation of the leaves of Pometia pinnata resulted in the isolation of a new triterpenoid saponin (1), together with a known compound, kaemferol 3- O-α-L-rhamnopyranoside (2). The structure of 1 was established as 3- O-[α-L-arabinofuranosyl-(1→4)–α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl]-hederagenin. The structure elucidation of the isolated compounds was based primarily on 1D- and 2D-NMR techniques, including 1H and 13C NMR spectra, DEPT, and by 2D COSY, HMQC, HMBC and TOCSY experiments.

New investigations of the reaction of epichlorohydrin with hindered amines: X-ray and NMR analyses

1989 ◽  
Vol 67 (10) ◽  
pp. 1514-1522 ◽  
Author(s):  
Michel Laguerre ◽  
Chantal Boyer ◽  
Jean-Michel Leger ◽  
Alain Carpy
Keyword(s):  
Hydroxy Group ◽  
Amino Alcohol ◽  
Structure Elucidation ◽  
Nmr Spectra ◽  
Secondary Amines ◽  
Primary Amines ◽  
Nmr Studies ◽  
X Ray ◽  
Hindered Amines ◽  
C Nmr

During the synthesis of a series of new antiarhythmic drugs, the reaction between epichlorohydrin and hindered amines was reinvestigated. With primary amines, 3-azetidinols were formed in fair yields. The X-ray structure elucidation of one of these compounds (1: P21/n, a = 17.210, b = 6.665, c = 23.585, β = 102.29, and R = 0.064 for 2005 observed reflections) and NMR studies led to the conclusion that both the hydroxy group and the bulky nitrogen substituent are on the same side of the azetidine ring. With secondary amines, the reaction was very complex, leading to diamino dioxane, diamino alcohols, amino alcohol ethers, and one glycol. X-ray analysis and 1H and 13C NMR studies allowed complete assignments for all compounds. All but one exhibited a slow interconversion of the nitrogen visible in the 13C NMR spectra. Keywords: epichlorohydrin, hindered amines, azetidinol, adamantane, alkanol amines.

Conformational structure of ethylene glycol dibenzoate. Vibrational and NMR spectra

1981 ◽  
Vol 46 (8) ◽  
pp. 1913-1929 ◽  
Author(s):  
Bohdan Schneider ◽  
Pavel Sedláček ◽  
Jan Štokr ◽  
Danica Doskočilová ◽  
Jan Lövy
Keyword(s):  
Ethylene Glycol ◽  
Vibrational Spectra ◽  
Nmr Spectra ◽  
Coupling Constants ◽  
Conformational Structure ◽  
Infrared And Raman Spectra ◽  
H Nmr ◽  
Liquid States ◽  
Crystalline Forms ◽  
C Nmr

It was found that three crystalline forms of ethylene glycol dibenzoate can be prepared. Infrared and Raman spectra of these three forms, as well as of the glassy and liquid states, were measured. From 3JHH coupling constants obtained by analysis of the 13C satellite band of the -CH2- group in 1H NMR spectra, and from the 3JCH coupling constants of the -CO.O.CH2- fragment obtained by analysis of the carbonyl band in 13C NMR spectra it was found that in the liquid state the -CH2-CH2- group exists predominantly in the gauche conformational structure, and the bonds C-O-C-C assume predominantly a trans orientation. The results of the analysis of NMR and vibrational spectra were used for the structural interpretation of conformationally sensitive bands in vibrational spectra of ethylene glycol dibenzoate.

13C NMR spectra of 1-aryl-ferrocenylethylenes

1986 ◽  
Vol 51 (3) ◽  
pp. 670-676 ◽  
Author(s):  
Eva Solčániová ◽  
Štefan Toma ◽  
Tibor Liptaj
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
Substituent Effects ◽  
13C Nmr Spectra ◽  
Bridge Group ◽  
C Nmr ◽  
Electron Effects

13C NMR spectra of 18 ferrocene analogues of trans stilbenes (1-aryl-2-ferrocenylethylenes) were measured. It was found that bridge group weakens the transfer of the substituent electron effects into ferrocene nucleus, especially distinctly into 3',4'positions of cyclopentadienyl ring. The transfer of substituent effects into β-position of the bridge -CH=CH- is greater in derivatives studied by us than in stilbenes. Synthesis of 1-(4-dimethylaminophenyl)-2-ferrocenylethylene is described.

The synthesis and stereochemistry of the ternary cobalt(III) complex with a stereospecific ligand derived from (S)-leucine

1986 ◽  
Vol 51 (2) ◽  
pp. 318-326 ◽  
Author(s):  
Milan Strašák ◽  
Pavol Novomeský
Keyword(s):  
Ir Spectroscopy ◽  
Aqueous Medium ◽  
Absorption Spectroscopy ◽  
Absolute Configuration ◽  
Nmr Spectra ◽  
Methyl Groups ◽  
Electron Absorption Spectroscopy ◽  
Electron Absorption ◽  
C Nmr

A new stereospecific ligand, ethylenediamine-N,N'-di(S)-α-isocapronic acid, was synthesized by condensation of (S)-leucine with 1,2-dibromoethane in alkaline aqueous medium. It follows from the 1H and 13C NMR spectra that the terminal methyl groups are chemically and magnetically nonequivalent. Of the four theoretically possible isomers of the ternary cobalt (III) complex with ethylenediamine, separation on catex yielded only one, whose absolute configuration was determined by a combination of 1H and 13C NMR, electron absorption spectroscopy and CD and IR spectroscopy.

17O and 13C NMR spectra of some geminal diacetates

1988 ◽  
Vol 53 (3) ◽  
pp. 588-592 ◽  
Author(s):  
Antonín Lyčka ◽  
Josef Jirman ◽  
Jaroslav Holeček
Keyword(s):  
13C Nmr ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
The Other ◽  
13C Nmr Spectra ◽  
Other Hand ◽  
Carboxylic Esters ◽  
C Nmr ◽  
Oxygen Atoms

The 17O and 13C NMR spectra of eight geminal diacetates RCH(O(CO)CH3)2 derived from simple aldehydes have been measured. In contrast to the dicarboxylates R1R2E(O(CO)R3)2, where E = Si, Ge, or Sn, whose 17O NMR spectra only contain a single signal, and, on the other hand, in accordance with organic carboxylic esters, the 17O NMR spectra of the compound group studied always exhibit two well-resolved signals with the chemical shifts δ(17O) in the regions of 183-219 ppm and 369-381 ppm for the oxygen atoms in the groups C-O and C=O, respectively.

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