scholarly journals FTIR and1H-NMR studies of chiral (S)-(-)-2-methylbutyl 4′-(4″-hexyloxy-, (S)-(-)-2-methylbutyl 4′-(4″-(d13)-hexyloxy‒, (S)-(-)-2-methylbutyl 4′-(4″-octyloxy- and (S)-(-)-2-methylbutyl 4′-(4″-(d17)-octyloxyphenyl)benzoates

2000 ◽  
Vol 14 (3) ◽  
pp. 93-98 ◽  
Author(s):  
Guan-Yeow Yeap ◽  
Yoichi Takanishi ◽  
Hideo Takezoe
Keyword(s):  
Elemental Analysis ◽  
Potassium Bromide ◽  
Ftir Spectra ◽  
Nmr Studies ◽  
Chiral Compounds ◽  
H Nmr ◽  
First Time

Four organic chiral compounds (S)-(-)-2-methylbutyl 4′-(4″-hexyloxy-, (S)-(-)-2-methylbutyl 4′-(4″-(d13)- hexyloxy-, (S)-(-)-2-methylbutyl 4′-(4″-octyloxy- and (S)-(-)-2-methylbutyl 4′-(4″-(d17)-octyloxy-phenyl)benzoates were synthesized via generalized methods and characterized by elemental analysis, FTIR and1H NMR. A noticeable difference between the compounds which possess hydrogenated achiral substituent with the deuterated counterparts as exemplified from the FTIR spectra has been suggested for the first time to result from the afinity of the latter compounds towards hydroxylation induced by potassium bromide.

Synthesis and properties of axially substituted zirconium(IV) and hafnium(IV) phthalocyanines with organic ligands

2001 ◽  
Vol 05 (10) ◽  
pp. 731-734 ◽  
Author(s):  
L. A. TOMACHYNSKI ◽  
V. YA. CHERNII ◽  
S. V. VOLKOV
Keyword(s):  
Elemental Analysis ◽  
Water Soluble ◽  
Organic Ligands ◽  
Axial Position ◽  
H Nmr ◽  
New Compounds ◽  
First Time

Water-soluble phthalocyaninato zirconium(IV) and hafnium(IV) complexes have been synthesized for the first time. An increased solubility in comparison to PcZrCl 2 and PcHfCl 2 was caused by the introduction of gallic, 1,8-dihydroxynaphthalene-3,6-disulfonic (chromotropic), and 5-sulfosalicylic acids in the axial position. The new compounds were characterized by 1 H NMR, IR, UV-vis and elemental analysis.

Seco-porphyrazines with eight (p-tolyl) and (o-tolyl) units

2008 ◽  
Vol 12 (02) ◽  
pp. 116-122 ◽  
Author(s):  
Ergün Gonca ◽  
Ümmü Gülsüm Baklaci ◽  
Hatice Akin Dinçer
Keyword(s):  
Spectral Data ◽  
Elemental Analysis ◽  
Trifluoroacetic Acid ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
H Nmr ◽  
Ft Ir ◽  
First Time ◽  
Oxidized Products

Magnesium porphyrazinates substituted with eight (p-tolyl) and (o-tolyl) units on the peripheral positions have been synthesized for the first time by cyclotetramerization of 1,2-bis(p-tolyl)maleonitrile and 1,2-bis(o-tolyl)maleonitrile in the presence of magnesium butanolate. Their demetalation by the treatment with trifluoroacetic acid resulted in partially oxidized products, namely, octakis(p-tolyl)-2-seco-porphyrazine-2,3-dione and octakis(o-tolyl)-2-seco-porphyrazine-2,3-dione. Further reactions of these products with copper(II) acetate, zinc(II) acetate and cobalt(II) acetate have led to the metallo derivatives, [octakis(p-tolyl)-2-seco-2,3-dioxoporphyrazinato] M(II) and [octakis(o-tolyl)-2-seco-2,3-dioxoporphyrazinato] M(II) ( M = Cu , Zn , Co ). These novel compounds have been characterized by elemental analysis, together with FT-IR, 1H NMR, UV-vis and mass spectral data.

Imino Diels–Alder reaction — An efficient synthetic protocol for 2-methyl-4-substituted tetrahydroquinolines catalyzed by copper dipyridine dichloride

2010 ◽  
Vol 88 (5) ◽  
pp. 443-452 ◽  
Author(s):  
C. S. Kavitha ◽  
K. M. Hosamani ◽  
R. S. Harisha
Keyword(s):  
Elemental Analysis ◽  
Alder Reaction ◽  
Diels Alder ◽  
Reusable Catalyst ◽  
Substituted Anilines ◽  
H Nmr ◽  
Diels Alder Reaction ◽  
First Time ◽  
C Nmr

For the first time, copper dipyridine dichloride (CuPy2Cl2) is used as an efficient and reusable catalyst for the imino Diels–Alder reaction of para-substituted anilines with N-vinylpyrrolidinone, N-vinylcarbazole, and N-vinylcaprolactam in acetonitrile to afford the corresponding 2-methyl-4-substituted-1,2,3,4-tetrahydroquinoline derivatives in excellent yields with good purity. The products were characterized by FTIR, 1H NMR, 13C NMR, MS, and elemental analysis.

Sesquiterpenes and Flavonoid Aglycones from a Hungarian Taxon of the Achillea millefolium Group

2002 ◽  
Vol 57 (11-12) ◽  
pp. 976-982 ◽  
Author(s):  
Sabine Glasl ◽  
Pavel Mucaji ◽  
Ingrid Werner ◽  
Armin Presser ◽  
Johann Jurenitsch
Keyword(s):  
2D Nmr ◽  
The Other ◽  
Achillea Millefolium ◽  
Spectroscopic Methods ◽  
Nmr Studies ◽  
Flavonoid Aglycones ◽  
H Nmr ◽  
Nmr Data ◽  
First Time ◽  
C Nmr

The investigation of a dichloromethane extract of flower heads of a Hungarian taxon of the Achillea millefolium group led to the isolation of three flavonoid aglycones, one triterpene, one germacranolide and five guaianolides. Their structures were elucidated by UV-VIS, EI- and CI-MS, 1H NMR and 13C NMR spectroscopic methods as well as by 2D-NMR studies and by selective 1D-NOE experiments. Besides apigenin, luteolin and centaureidin, β-sitosterol, 3β-hydroxy-11α,13-dihydro-costunolide, desacetylmatricarin, leucodin, achillin, 8α-angeloxy-leucodin and 8α-angeloxy-achillin were isolated. Both latter substances are reported here for the first time. Their NMR data were compared with those of the other guaianolides. The stereochemistry of 3β-hydroxy-11α,13-dihydro-costunolide was discussed and compared with data of the literature.

1H NMR Conformational Studies in Water of Angiotensin II Analogues Modified at the N- and C-Termini: Interactions of the Aromatic Side Chains and Folding of the N-Terminal Domain

1994 ◽  
Vol 59 (11) ◽  
pp. 2523-2532 ◽  
Author(s):  
John Hondrelis ◽  
John Matsoukas ◽  
George Agelis ◽  
Paul Cordopatis ◽  
Ning Zhou ◽  
...  
Keyword(s):  
Shielding Effect ◽  
Resonance Spectroscopy ◽  
Nmr Studies ◽  
Previous Suggestion ◽  
Aminoisobutyric Acid ◽  
H Nmr ◽  
Neutral Ph ◽  
Angiotensin Ii Analogues ◽  
Proton Resonances ◽  
Cosy Nmr

The conformation of [Sar1]angiotensin II in water at neutral pH has been examined by proton magnetic resonance spectroscopy at 400 MHz and in particular by comparing its 1H NMR spectral data with those of analogues modified at positions 1,4 and 6, namely [Sar1,Cha8]ANGII, [Des Asp1,Cha8]ANGII, [Aib1,Tyr(Me)4]ANGII, [Aib1,Tyr(Me)4,Ile8]ANGII, [N-MeAib1,Tyr(Me)4]ANGII, [N-MeAib1,Tyr(Me)4,Ile8]ANGII, ANGIII and [Sar1,Ile8]ANGII. Assignment of all proton resonances in these analogues was made possible by 2D COSY NMR experiments. The H-2 and H-4 protons for the histidine ring in [Sar1]ANGII, ANGII and ANGIII were shielded compared with the same protons in [Sar1,Ile8]ANGII, [Sar1,Cha8]ANGII and [Des Asp1,Cha8]ANGII; this shielding effect was not disturbed upon methylation of the tyrosine hydroxyl and/or replacement of residue 1 (sarcosine or aspartic acid) with aminoisobutyric acid (Aib) or N-methyl aminoisobutyric acid (N-MeAib). These data are consistent with our previous suggestion based on NMR studies in neutral DMSO that a characteristic folded conformation for ANGII previously observed in non-polar solvents can also be detected in water at neutral pH, but to a lesser degree.

Synthesis and Antituberculotic Activity of Some Substituted 3-Arylamino-5-cyano-2-pyrazinecarboxamides

1995 ◽  
Vol 60 (7) ◽  
pp. 1236-1241 ◽  
Author(s):  
Martin Doležal ◽  
Jiří Hartl ◽  
Antonín Lyčka ◽  
Vladimír Buchta ◽  
Želmíra Odlerová
Keyword(s):  
Nucleophilic Substitution ◽  
Elemental Analysis ◽  
Nmr Spectra ◽  
Substituted Anilines ◽  
H Nmr

Nucleophilic substitution of 3-chloro-5-cyano-2-pyrazinecarboxamide by substituted anilines afforded substituted 3-arylamino-5-cyano-2-pyrazinecarboxamides I-X. The structures of compounds were confirmed by elemental analysis, UV, IR and 1H NMR spectra. The assessment of in vitro antimycotic and antimycobacterial activities of the compounds was carried out. The highest antituberculotic activity against M. tuberculosis in this series was shown by 3-anilino- 5-cyano-2-pyrazinecarboxamide (I), whose efficacy was the same as that of pyrazinecarboxamide.

scholarly journals Isocyanate und verwandte Verbindungen des trimeren Phosphornitriddifluorids / Isocyanates and Related Compounds of Trimeric Phosphor-difluoronitride

1971 ◽  
Vol 26 (7) ◽  
pp. 679-683 ◽  
Author(s):  
Herbert W. Roesky ◽  
Enno Janssen
Keyword(s):  
Ir Spectra ◽  
Elemental Analysis ◽  
Mass Spectra ◽  
H Nmr ◽  
Carbonic Acids ◽  
Related Compounds

P3N3F5NCO was prepared by reaction of P3N3F5NSO with (COCl) 2. Substituted amides were obtained from the reaction of P3N3F5NSO with carbonic acids e. g. P3N3F5NHCOCH3, P3N3F5NHCOC2H5, and P3N3F5NHCOC3H7. If these substances were treated with PCl5 the following compounds P3N3F5N = CClCH3, P3N3F5N = CClCH5, and P3N3F5TN = CClC3H7 were formed. They reacted with nucleophiles to give P3N3F5N = CNH2CH3, P3N3F5N = TN (CH3) 2C2H5, and P3N3F5N = CN (CH3) 2CH7. The properties of these compounds are described. They were characterized by elemental analysis and IR-spectra. 19F-, 1H-NMR, and mass spectra are reported.

scholarly journals Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N2O2 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Lakhdar Sibous ◽  
Embarek Bentouhami ◽  
Mustayeen Ahmed Khan
Keyword(s):  
Schiff Base ◽  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Electrochemical Behaviour ◽  
Absolute Ethanol ◽  
Molar Ratio ◽  
H Nmr ◽  
Chelating Ligand ◽  
Metal Ligand

4,4′-Diaminobiphenyl reacts with 2,4-pentanedione in absolute ethanol in a molar ratio 1 : 2 to form mainly the product of [1 + 2] condensation, 4,4′-(biphenyl-4,4′-diyldinitrilo)dipentan-2-one (H2L). The Schiff base was used as tetradentate chelating ligand to coordinate CoII and NiII chlorides leading to complexes where the ratio of metal ligand was found to be 2 : 1 or 2 : 2. All the synthesized products were characterized by elemental analysis, infrared, electronic, and mass spectroscopy, 1H NMR, and DSC. The electrochemical behaviour of the ligand and its complexes in DMF is also investigated.

scholarly journals Synthesis, Characterization and Study of the Biological activity of Some Aldimines Derivatives

2006 ◽  
Vol 3 (4) ◽  
pp. 257-261 ◽  
Author(s):  
Mohamed N. Ibrahim ◽  
Hazem K. Al - Deeb
Keyword(s):  
Biological Activity ◽  
Schiff Bases ◽  
Aromatic Aldehyde ◽  
Aromatic Amine ◽  
Elemental Analysis ◽  
Primary Aromatic Amine ◽  
H Nmr

A number of imines derivatives have been synthesized, they were obtained by condensation of aromatic aldehyde derivatives with primary aromatic amine derivatives. Their structures have been characterised by IR,1H NMR in addition to the elemental analysis. The biological activity of these imines (which are also known as Schiff bases) were examined against different type of microorganisms and they found to have considerable activity in comparison with the most commonly used antibiotics.

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