scholarly journals Synthesis and Characterization of New Mannich Bases Derived from 7-hydroxy-4-methyl Coumarin

2016 ◽  
Vol 13 (2) ◽  
pp. 235-243
Author(s):  
Baghdad Science Journal
Keyword(s):  
Spectral Analysis ◽  
Mass Spectrum ◽  
Physical Properties ◽  
Benzene Ring ◽  
Sodium Acetate ◽  
Mannich Bases ◽  
Primary Amines ◽  
Synthesis And Characterization ◽  
Coumarin Derivatives

Coumarin is a natural substance isolated from different plants. It belonges to a group of benzobyrones which consists of a benzene ring joined to a pyrone nucleus. In the present research, a new series of coumarin derivatives were formed. Compound (1) (7-hydroxy-4-methyl Coumarin) was converted into 4-methylquinolin-2(H) derivative (2) by reaction with acetamide, and then reaction of (2) with thiosemicarbazide in ethanol leads to the synthesize of hydrazincarbothioamide derivative (3).The reaction of (3) with ethylchloroacetate in presence of sodium acetate leads to closure ring to get [(1-(5-oxo-2-thioxoimidazolidin-1-ylimino) ethyl)]quinolin-2(1H)-one (4). Mannich bases were prepared through the reaction of (4) with primary amines to form compounds (5-6). New coumarin derivatives were characterized by their physical properties and various spectral analysis like: FTIR, 1HNMR spectra and GC-Mass spectrum for some of them.

scholarly journals Synthesis and characterization of some novel coumarin based various 2-aryl-pyrido [3,2-c] coumarins

2020 ◽  
Vol 10 (2) ◽  
pp. 158-163
Author(s):  
Mahesh K. Pandya ◽  
Tapan H. Parekh ◽  
Mehulsinh R. Chhasatia ◽  
Nileshkumar D. Vala
Keyword(s):  
Acetic Acid ◽  
Spectral Data ◽  
Ammonium Acetate ◽  
Mannich Bases ◽  
Synthesis And Characterization ◽  
Pyridinium Salts ◽  
Coumarin Derivatives ◽  
New Methods ◽  
Active Interest

A survey of the literature reveals that the number of coumarin derivatives having heterocyclic moieties either as substituent groups or fused with parent coumarin nucleus possesses a variety of functions and are widely used in drugs and dyes. Because of this wide utility, the synthesis of coumarin has remained a subject of active interest. Looking at the importance of these heterocoumarins and with a view to exploring new methods of their synthesis, the present work was undertaken and  this synthesis deals with  various 2-aryl-pyrido [3,2-c] coumarins. The compounds have been synthesized by reacting Mannich bases of various 4-hydroxy coumarins with pyridinium salts of various aroyl methyl bromides in the presence of ammonium acetate and acetic acid. All the compounds synthesized have been characterized by analytical and spectral data. Keywords: Pyrido, Coumarins, Krohanke’s reaction.

scholarly journals Synthesis and characterization of new complexes of Co+2 , Ni+2 , Cu+2 and Zn+2 with (Sodium acetate thio ) ethylene ligands

2013 ◽  
Vol 10 (3) ◽  
pp. 650-657
Author(s):  
Baghdad Science Journal
Keyword(s):  
Content Analysis ◽  
General Formula ◽  
Metal Content ◽  
Sodium Acetate ◽  
Magnetic Measurement ◽  
Synthesis And Characterization ◽  
Square Planar ◽  
Square Planar Complexes ◽  
Uv Visible

This research involves the preparation of new ligands 1,1,2,2- tetrakis (sodium acetate thio)ethylene(L1) and 1,1,2- tris(sodiumacetatethio) ethylene(L2), through the reaction of disodium thioglycolate) with tetra chloro ethylene or tri chloro ethylene in (1:4) or (1:3) moler ratio . Homodinucliar complexes of general formlu [M2(L1)] and [M2(L2)ClH2O] , when M= Co(II), Ni(II), Cu (II) and Zn(II) also mono nuclear complexes of general formula [M(L2)] . The prepared complexes were characterized using spectral method (UV/Visible/ IR) , metal content analysis , magnetic and atomic measurements . The spectral and magnetic measurement indicats that some complexes have tetrahedral or square planar complexes environtment .

Towards the Synthesis of Mono- and Bi-Functional Amphiphilic Oligothiophenes: Organic Materials for Opto-Electronic Applications

1999 ◽  
Vol 561 ◽  
Author(s):  
R.C. Advincula ◽  
S. Inaoka ◽  
M. Park ◽  
D. Phillips ◽  
D.M. Shin
Keyword(s):  
Physical Properties ◽  
Ultrathin Films ◽  
Organic Materials ◽  
Photophysical Properties ◽  
Electronic Devices ◽  
Synthesis And Characterization ◽  
Important Class ◽  
Maldi Tof Ms ◽  
Tof Ms

ABSTRACTIn this report, we describe our initial synthesis and characterization of mono-functional and bi-functional dibromoalkyl oligothiophenes to achieve amphiphilicity and telechelic functionality. Oligothiophenes are an important class of organic materials for opto-electronic devices and display applications. We have mono-functionalized oligothiophenes by the synthesis of a quinquethiophene bromoalkyl derivative. A bi-functional sexithiophene was derived primarily by the symmetrical coupling of terthiophene derivatives. Both were synthesized using Grignard coupling and lithiation reaction methodologies. UV-Vis, IR, NMR, MALDI-TOF-MS, and DSC confirmed the structure and physical properties of the oligomers. In addition, we have also synthesized an amphiphilic diamine derivative from the reaction of hexamethylenediamine with a bromoalkyl terthiophene derivative. Using photoluminescence, the photophysical properties of the oligomers were found to be that of typical oligothiophenes. Processing as ultrathin films for devices is currently being investigated.

Synthesis and Physical Properties of Skutterudite Superlattices

2000 ◽  
Vol 626 ◽  
Author(s):  
Joshua R. Williams ◽  
David C. Johnson ◽  
Michael Kaeser ◽  
Terry Tritt ◽  
George Nolas ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Physical Properties ◽  
High Temperatures ◽  
Synthesis And Characterization ◽  
Superlattice Structure

ABSTRACTPredicted and observed reductions in thermal conductivity of materials with superlattice structure have prompted interesting research into the possibility of using these materials as higher efficiency thermoelectrics. Synthesis of superlattice materials is challenging however, as the structure itself is generally not very stable at high temperatures as it is prone to interdiffusion. Presented here is the successful synthesis and characterization of a superlattice composed of two materials with the skutterudite structure, IrSb3 and CoSb3.

Synthesis and characterization of photocrosslinkable albumin-based hydrogels for biomedical applications

Soft Matter ◽  
2020 ◽  
Vol 16 (40) ◽  
pp. 9242-9252
Author(s):  
Darlin Lantigua ◽  
Michelle A. Nguyen ◽  
Xinchen Wu ◽  
Sanika Suvarnapathaki ◽  
Seongjin Kwon ◽  
...  
Keyword(s):  
Physical Properties ◽  
Glycidyl Methacrylate ◽  
Biomedical Applications ◽  
Synthesis And Characterization

Modulating the levels of glycidyl methacrylate modification in the BSAGMA prepolymer yields hydrogel products with tunable physical properties and enhanced biocompatibility, making BSAGMA hydrogels suitable for a range of biomedical applications.

Synthesis and characterization of Mannich bases of lawsone and their anticancer activity

2020 ◽  
Vol 50 (11) ◽  
pp. 1724-1735
Author(s):  
Pratik Nariya ◽  
Falguni Shukla ◽  
Hitarthi Vyas ◽  
Ranjitsinh Devkar ◽  
Sonal Thakore
Keyword(s):  
Anticancer Activity ◽  
Mannich Bases ◽  
Synthesis And Characterization

Synthesis and characterization of SFX-based coumarin derivatives for OLEDs

2021 ◽  
Vol 185 ◽  
pp. 108969
Author(s):  
Hui Zhang ◽  
Xiaochun Liu ◽  
Yuxuan Gong ◽  
Tianzhi Yu ◽  
Yuling Zhao
Keyword(s):  
Synthesis And Characterization ◽  
Coumarin Derivatives
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