scholarly journals Preparation and Identification of Novel 1, 3-Oxazepine Derivatives by Cycloaddition Reactions [2+5] of Selected Carboxylic Acid Anhydrides with Imines Derived from 4-methyl aniline

2018 ◽  
Vol 29 (2) ◽  
pp. 93 ◽  
Author(s):  
Obaid H. Abid ◽  
Ahmed Khames Ramadan
Keyword(s):  
Carboxylic Acid ◽  
Physical Properties ◽  
Spectral Data ◽  
1H Nmr ◽  
Cycloaddition Reaction ◽  
Absolute Ethanol ◽  
Cycloaddition Reactions ◽  
Thermal Condensation ◽  
Ft Ir ◽  
Acid Anhydrides

Novel 1,3-oxazepine derivatives have been synthesis via (2+5) cycloaddition reaction of imines and selected cyclic carboxylic acid anhydrides by refluxing in dry benzene. Imines have been prepared by thermal condensation of 4-methyl aniline and para substituted benzaldehyde in absolute ethanol under reflux conditions. The structure of the target compounds were Identified by some physical properties and spectral data of FT-IR and 1H-NMR.

scholarly journals Quinazolin-4(3H)-ones and 5,6-Dihydropyrimidin-4(3H)-ones from β-Aminoamides and Orthoesters

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2925 ◽  
Author(s):  
Joshua Gavin ◽  
Joel Annor-Gyamfi ◽  
Richard Bunce
Keyword(s):  
Acetic Acid ◽  
Melting Point ◽  
1H Nmr ◽  
13C Nmr ◽  
Pressure Tube ◽  
Absolute Ethanol ◽  
Basic Nitrogen ◽  
One Step ◽  
Ft Ir

Quinazolin-4(3H)-ones have been prepared in one step from 2-aminobenzamides and orthoesters in the presence of acetic acid. Simple 2-aminobenzamides were easily converted to the heterocycles by refluxing in absolute ethanol with 1.5 equivalents of the orthoester and 2 equivalents of acetic acid for 12–24 h. Ring-substituted and hindered 2-aminobenzamides as well as cases incorporating an additional basic nitrogen required pressure tube conditions with 3 equivalents each of the orthoester and acetic acid in ethanol at 110 °C for 12–72 h. The reaction was tolerant towards functionality on the benzamide and a range of structures was accessible. Workup involved removal of the solvent under vacuum and either recrystallization from ethanol or trituration with ether-pentane. Several 5,6-dihydropyrimidin-4(3H)-ones were also prepared from 3-amino-2,2-dimethylpropionamide. All products were characterized by melting point, FT-IR, 1H-NMR, 13C-NMR, and HRMS.

scholarly journals Synthesis and Characterization of some New 1,3,4-Oxadiazole derivatives based on 4-amino benzoic acid

2016 ◽  
Vol 13 (4) ◽  
pp. 762-769
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Benzoic Acid ◽  
Spectral Data ◽  
1H Nmr ◽  
Synthesis And Characterization ◽  
Oxadiazole Derivatives ◽  
Ft Ir ◽  
Amino Benzoic Acid

Various of 2,5- disubstituted 1,3,4-oxadiazole (Schiff base, ?- lactam and azo) were synthesized from 2,5-di (4,4?-amino-1,3,4-oxadiazole which usequently synth-esized from mixture of 4- amino benzoic acid and hydrazine arch of polyphosphorus acid. The synthesized compounds were cherecterized by using some spectral data (UV, FT-IR , and 1H-NMR)

scholarly journals Synthesis, Characterization and Photo-Physical Properties of Europium(III) and Terbium(III) Complexes with Thiosemicarbazones

2020 ◽  
Vol 32 (4) ◽  
pp. 952-958
Author(s):  
Ananya Vishwakarma ◽  
S.K. Sengupta ◽  
O.P. Pandey
Keyword(s):  
Physical Properties ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Emission Spectra ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
X Ray ◽  
Intense Peak ◽  
Ft Ir

Europium(III) and Terbium(III) complexes of type [Eu(L)Cl(H2O)2] and [Tb(L)OAc(H2O)2] (H2L = thiosemicarbazone ligands derived from substituted thiosemicarbazide and benzil/diacetyl) were synthesized. The ligands and synthesized complexes were characterized on the basis of elemental analysis, FT-IR and 1H NMR and X-ray diffraction studies. Photo-physical properties such as excitation spectra, emission spectra and luminescence curves of complexes were investigated. The most intense peak of Eu3+ ion found at 618 nm attributed to 5D0 → 7F2 transition and peak of Tb3+ ion at 549 nm attributed to 5D4 →7F5 transition.

scholarly journals Synthesis, Characterization of some New 1, 3, 4-Oxadiazole derivatives based on 4- amino benzoic acid

2016 ◽  
Vol 13 (2) ◽  
pp. 289-297
Author(s):  
Baghdad Science Journal
Keyword(s):  
Schiff Base ◽  
Benzoic Acid ◽  
Spectral Data ◽  
1H Nmr ◽  
Oxadiazole Derivatives ◽  
Ft Ir ◽  
Amino Benzoic Acid

In this research various of 2,5-disubstituted 1,3,4-oxadiazole (Schiff base, oxo-thiazolidine , and other compounds) were synthesized from 2,5-di(4,4?- amino-1,3,4-oxadiazole ) which use quently synthesized from mixture of 4-amino benzoic acid and hydrazine in the presence of polyphosphorus acid. The synthesized compounds were characterized by using some Spectral data (UV, FT-IR, and 1H-NMR).

scholarly journals Utilization of 1-phenylimidazo[1,5-a]quinoline as partner in 1,4-dipolar cycloaddition reactions

2020 ◽  
Vol 75 (3) ◽  
pp. 259-267
Author(s):  
Areej M. Jaber ◽  
Jalal A. Zahra ◽  
Mustafa M. El-Abadelah ◽  
Salim S. Sabri ◽  
Monther A. Khanfar ◽  
...  
Keyword(s):  
Single Crystal ◽  
Spectral Data ◽  
Cycloaddition Reaction ◽  
Dipolar Cycloaddition ◽  
Cycloaddition Reactions ◽  
Dimethyl Acetylenedicarboxylate ◽  
X Ray ◽  
X Ray Crystallography

AbstractA Selected set of 2-(quinolin-2-yl)-1,3-oxazepino[7,6-b]indoles 4a–d and dihydroacenaphtho[1,2-f][1,3]oxazepine 5 have been prepared via 1,4-dipolar cycloaddition reaction involving 1-phenylimidazo[1,5-a]quinoline, dimethyl acetylenedicarboxylate, and N-(substituted)isatins or acenaphthoquinone. Structures of the new heterocycles 4a–d and 5 are supported by NMR and HRMS spectral data, and confirmed by single-crystal X-ray crystallography for 4c and 5.

scholarly journals Synthesis and Characterization of New heterocyclic Polyacrylamides from Derivatives 2-Aminobenzothiazole

2014 ◽  
Vol 11 (2) ◽  
pp. 407-418
Author(s):  
Baghdad Science Journal
Keyword(s):  
Physical Properties ◽  
1H Nmr ◽  
Synthesis And Characterization ◽  
Melting Points ◽  
Ft Ir ◽  
Ethyl Amine ◽  
Structure Confirmation

The present work involved preparation of new hetro cyclic polyacrylamides (1-9) using reaction of polyacryloyl chloride with 2-aminobenzothiazole which prepeard by thiocyanogen method in the presence of a suitable solvent and amount tri ethyl amine (Et3N) with heating. The structure confirmation of polymers were proved using FT-IR,1H-NMR,C13NMR and UV spectroscopy.Other physical properties including softening and melting points, and solubility of the polymers were also measured.

scholarly journals Synthesis, Characterization of Derivatives Tetrazoles for Trimethoprim Drug

2016 ◽  
Vol 13 (2) ◽  
pp. 266-274
Author(s):  
Baghdad Science Journal
Keyword(s):  
Nmr Spectroscopy ◽  
Physical Properties ◽  
Schiff Bases ◽  
1H Nmr ◽  
13C Nmr ◽  
1H Nmr Spectroscopy ◽  
Second Step ◽  
Direct Reaction ◽  
Ft Ir

The present work involved synthesis of serval new substituted tetrazole via Schiff bases for trimethoprim drug by two steps. The first step involved direct reaction of different ketones and aldehydes with trimethoprim producing the corresponding Schiff bases (1-10), whereas the second step, involved preparation new tetrazoles derivatives (11-20) through reaction of the ready Schiff bases (in the first step) with sodium azidein in dioxin. The prepared compounds were characterized by UV, FT-IR, and some of them by 13C-NMR, 1H-NMR spectroscopy and physical properties.

1H NMR Relaxometry and ATR-FT-IR Spectrosopy Used for the Assesment of Wastewater Treatment in Slaughterhouse

2018 ◽  
Vol 63 (1-2) ◽  
pp. 49-60
Author(s):  
R. Crainic ◽  
◽  
L. R. Drăgan ◽  
R. Fechete ◽  
◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
1H Nmr ◽  
Nmr Relaxometry ◽  
Ft Ir ◽  
1H Nmr Relaxometry
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