Cellulose nanocrystals obtained from microcrystalline cellulose by p-toluene sulfonic acid hydrolysis, NaOH and ethylenediamine treatment

Cellulose ◽  
2022 ◽  
Author(s):  
Songlin Wang ◽  
Qian Wang ◽  
Yao Kai
Keyword(s):  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Cellulose Nanocrystals ◽  
Sulfonic Acid ◽  
Toluene Sulfonic Acid

scholarly journals Cellulose Nanocrystals Obtained From Microcrystalline Cellulose by p-toluene Sulfonic Acid Hydrolysis, NaOH and Ethylenediamine Treatment

2021 ◽  
Author(s):  
Songlin Wang ◽  
Qian Wang ◽  
Yao Kai
Keyword(s):  
Microcrystalline Cellulose ◽  
Cellulose Nanocrystals ◽  
Sulfonic Acid ◽  
Crystallinity Index ◽  
X Ray Diffraction ◽  
Cellulose I ◽  
Good Thermal Stability ◽  
Transmission Electron ◽  
Toluene Sulfonic Acid ◽  
Comprehensive Characterization

Abstract Cellulose nanocrystals (CNC) were first isolated from microcrystalline cellulose (MCC) by p-toluene sulfonic acid (p-TsOH) hydrolysis. Cellulose II nanocrystal (CNC II) and cellulose III nanocrystal (CNC III) were then formed by swelling the obtained cellulose I nanocrystal (CNC I) in concentrated sodium hydroxide solutions and ethylenediamine (EDA) respectively. The properties of CNC I, CNC II and CNC III were subjected to comprehensive characterization by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results indicated that CNC I, CNC II and CNC III obtained in this research had high crystallinity index and good thermal stability. The degradation temperatures of the resulted CNC I, CNC II and CNC III were 300 ℃, 275 ℃ and 242 ℃, respectively. No ester bonds were found in the resulted CNC. CNC prepared in this research also had large aspect ratio and high negative zeta potential.

Design, Synthesis, Antimicrobial Evaluation and Molecular Modeling Study of New 2-mercaptoimidazoles (Series-III)

2019 ◽  
Vol 16 (5) ◽  
pp. 512-521 ◽  
Author(s):  
Nidhi Rani ◽  
Randhir Singh
Keyword(s):  
Sulfonic Acid ◽  
Docking Study ◽  
Molecular Docking Study ◽  
One Pot ◽  
Design Synthesis ◽  
Toluene Sulfonic Acid ◽  
Antimicrobial Evaluation ◽  
Bacteria And Fungi ◽  
High Yields ◽  
Antimicrobial Potency

Background: A series of novel substituted 2-mercaptoimidazoles was synthesised efficiently and in high yields using one-pot synthesis from m-hydroxyacetophenones. Methods: The structures of the newly synthesized compounds were established, their molecular activity was investigated against some bacteria and fungi were further validated using molecular docking study. Results: Reaction of o-hydroxyphenacylbromide (2) with substituted aniline and KSCN, in the presence of catalyst p-toluene sulfonic acid afforded 4(a-r) in good yield. The structure of compounds (4a-r) was confirmed by IR, NMR and MS. Conclusion: The compounds exhibited excellent antimicrobial potency against the tested microorganism.

scholarly journals A Simple and Green Protocol for 2H-Indazolo[2,1-b]phthalazine-triones Using Grinding Method

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Xiao-chuan Jia ◽  
Jing Li ◽  
Yu Ding ◽  
Bin Zhang ◽  
Na Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Sulfonic Acid ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Short Reaction Time ◽  
Green Protocol ◽  
Simple Operation ◽  
Grinding Method ◽  
Toluene Sulfonic Acid ◽  
High Yields

A robust, facile, and solvent-free route for the three-component synthesis of 2H-indazolo[2,1-b]phthalazine-triones in the presence of a catalytic amount ofp-toluene sulfonic acid utilizing grinding has been developed. Short reaction time, simple operation, and high yields are the advantages of this protocol.

Synthesis of fatty 1,2,4-trioxanes by peracetalisation of β-hydroxy hydroperoxides

Synthesis ◽  
2021 ◽  
Author(s):  
Thomas De Dios Miguel ◽  
Dan Louvel ◽  
Killian Onida ◽  
Adeline Lavoignat ◽  
Stephane Picot ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Heterogeneous Catalysts ◽  
Antimalarial Activity ◽  
Acid Catalyst ◽  
Methyl Tert Butyl Ether ◽  
Significant Activity ◽  
Butyl Ether ◽  
Aliphatic Aldehydes ◽  
Toluene Sulfonic Acid ◽  
Optimized Conditions

The peracetalisation of a β-hydroxy hydroperoxide derived from methyl oleate was studied using benzaldehyde as a model substrate to give the corresponding fatty 1,2,4-trioxane. The desired product was obtained as a mixture of regioisomers but only one diastereoisomer of each was formed. The nature of the acid catalyst was studied and both para-toluene sulfonic acid (PTSA) and Amberlyst A35 (A35) were found to be efficient homogeneous and heterogeneous catalysts, respectively. The nature of the solvent was also investigated and ethereal solvents such as 2-methyltetrahydrofuran (2-MeTHF), methyl tert-butyl ether (MTBE) and cyclopentyl methyl ether (CPME) gave the best NMR yield (85%) for the preparation of the fatty trioxane. The optimized conditions were applied to a range of aromatic and aliphatic aldehydes and the corresponding 1,2,4-trioxanes were isolated with 30-91% yields (21 examples). The antimalarial activity of 3 trioxanes was studied against Plasmodium falciparum, however, no significant activity was detected (IC50 > 1600 nM).

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