recyclable catalyst
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2022 ◽  
Vol 19 ◽  
Angad B. Barkule ◽  
Yatin U. Gadkari ◽  
Vikas N. Telvekar

Abstract: A rapid and highly efficient methodology for the synthesis of 1, 2, 4-Triazolidine-3-thiones derivatives has been developed in the presence of a catalytic amount of guanidine hydrochloride using water as a solvent. The reaction of thiosemicarbazide with different aryl aldehydes resulted in the formation of title compounds in good yields (85% -95%) with a convenient reaction time (20-30 min). The key advantages of this approach are shorter reaction time, energy efficiency, easy work-up procedure, and wide substrate scope tolerance. Further, the catalyst was recycled without significant loss of its catalytic activity

2021 ◽  
Vol 37 (6) ◽  
pp. 1295-1301
Elmustapha Ennesyry ◽  
Fathallaah Bazi ◽  
Bahija Mounir ◽  
M’hammed Elkouali Elkouali ◽  
Hassan Hannache ◽  

Functionalized alkenes were successfully synthesized via a clean procedure in a short time by using a new recycled heterogeneous catalyst prepared from Moroccan oil shale, this catalyst is characterized by different technics such XRD, BET-BJH, MEB-EDS, and TGA, before it’s has been used in the Knoevenagel condensation between different aldehydes and active methylenes. The results showed that coupling the catalyst with ultrasound irradiations could improve the catalytic system in this transformation by achieving the products in a very short time, the results showed clearly that this catalyst could be considered as excellent recyclable support in Knoevenagel condensation.

2021 ◽  
Vol 161 ◽  
pp. 106467
Laura M. Orozco ◽  
Sandra Cardona ◽  
Claudia Gomez ◽  
Helen Inciarte ◽  
Yurany Villada ◽  

Mahmoud Nasrollahzadeh ◽  
Narjes Motahharifar ◽  
Mohaddeseh Sajjadi ◽  
Alireza Naserimanesh ◽  
Mohammadreza Shokouhimehr

2021 ◽  
Vol 2 (11) ◽  
pp. 1170-1175
Wangjing Ma ◽  
Xiao TC ◽  
Liu BN ◽  
Xu ZC ◽  
Jin ZQ ◽  

The accelerated UV visible photocatalytic carbon-carbon double bond isomerization of Linear Alpha Olefins (LAO) with 12-Tungstophosphate Acids (12-TPA) as an efficient, environmentally-friendly and recyclable catalyst was described, which produced the corresponding Linear Internal Olefins (LIO) in general high selectivity and high yields.

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