scholarly journals Cross-Linked Chitosan/Multi-Walled Carbon Nanotubes Composite as Ecofriendly Biocatalyst for Synthesis of Some Novel Benzil Bis-Thiazoles

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1728
Author(s):  
Latifah A. Alshabanah ◽  
Sobhi M. Gomha ◽  
Laila A. Al-Mutabagani ◽  
Tariq Z. Abolibda ◽  
Nahed A. Abd El-Ghany ◽  
...  

Aminohydrazide cross-linked chitosan (CLCS) and its MWCNTs (CLCS/MWCNTs) were formulated and utilized as a potent ecofriendly basic heterogeneous biocatalyst under ultrasonic irradiation for synthesis of two novel series of benzil bis-aryldiazenylthiazoles and benzil bis-arylhydrazonothiazolones from the reaction of benzil bis-thiosemicarbazone with 2-oxo-N′-arylpropanehydrazonoyl chlorides and ethyl 2-chloro-2-(2-phenylhydrazono) acetates, respectively. The chemical structures of the newly synthesized derivatives were elucidated by spectral data and alternative methods, where available. Additionally, their yield % was estimated using a traditional catalyst as TEA and green recyclable catalysts as CLCS and CLCS/MWCNTs composite in a comparative study. We observed that, under the same reaction conditions, the yield % of the desired products increased by changing TEA to CLCS then to CLCS/MWCNT from 72–78% to 79–83% to 84–87%, respectively. The thermal stability of the investigated samples could be arranged as CLCS/MWCNTs composite > CLCS > chitosan, where the weight losses of chitosan, CLCS and CLCS/MWCNTs composite at 500 °C were 65.46%, 57.95% and 53.29%, respectively.

2012 ◽  
Vol 97 (8) ◽  
pp. 1405-1414 ◽  
Author(s):  
Zuzana Morávková ◽  
Miroslava Trchová ◽  
Elena Tomšík ◽  
Juraj Čechvala ◽  
Jaroslav Stejskal

2012 ◽  
Vol 24 (17) ◽  
pp. 3510-3510 ◽  
Author(s):  
E. Dervishi ◽  
Z. Li ◽  
A. R. Biris ◽  
D. Lupu ◽  
S. Trigwell ◽  
...  

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