scholarly journals Co-N-Si/AC Catalyst for Aerobic Oxidation of Benzyl Alcohols to Esters under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6792
Author(s):  
Changjian Zhou ◽  
Rong Sun ◽  
Yuting Zhang ◽  
Biao Xiong ◽  
Hui Dai ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Significant Loss ◽  
Ambient Conditions ◽  
Benzyl Alcohols ◽  
Oxidative Esterification ◽  
Product Yields ◽  
Mild Conditions ◽  
Earth Abundant

A stable, earth-abundant, reusable cobalt-based heterogeneous catalyst is developed for the oxidative esterification of alcohols under ambient conditions, featuring broad substrate scope, providing good to excellent product yields. This protocol enables easy recyclability of the catalyst, measured up to five times without significant loss of efficiency. The active sites of Co-N-Si/AC are proposed to be Co-N species.

Nitrogen enriched polytriazine as a metal-free heterogeneous catalyst for the Knoevenagel reaction under mild conditions

2018 ◽  
Vol 42 (15) ◽  
pp. 12924-12928 ◽  
Author(s):  
Monika Chaudhary ◽  
Paritosh Mohanty
Keyword(s):  
Heterogeneous Catalyst ◽  
Knoevenagel Reaction ◽  
Ambient Conditions ◽  
Metal Free ◽  
Mild Conditions

A nitrogen-enriched nanoporous polytriazine was used as a metal-free heterogeneous organocatalyst for high-yielding ultra-fast Knoevenagel reactions under ambient conditions.

scholarly journals Recyclable [Ce(l-Pro)2]2 (Oxa) used as Heterogeneous Catalyst: One-Pot Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones in Ethanol

Synthesis ◽  
2017 ◽  
Vol 49 (23) ◽  
pp. 5143-5148 ◽  
Author(s):  
Ramesh Katla ◽  
Rakhi Chowrasia ◽  
Caren da Silva ◽  
Aline de Oliveira ◽  
Beatriz dos Santos ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Significant Loss ◽  
One Pot ◽  
Mild Conditions ◽  
One Pot Synthesis ◽  
The One ◽  
Recyclable Heterogeneous Catalyst

[Ce(l-Pro)2]2 (Oxa) was used as a recyclable heterogeneous catalyst under mild conditions for the preparation of 2-aryl-2,3-dihydroquinazolin-4(1H)-one derivatives. The one-pot protocol proceeds in ethanol using anthranilamide with several aldehydes at 50–55 °C. The catalyst can be recycled and reused three cycles without significant loss of catalytic activity.

scholarly journals Trimesic Acid-Functionalized Chitosan: A Novel And Efficient Multifunctional Organocatalyst For Green Synthesis of Polyhydroquinolines And Acridinediones Under Mild Conditions

2021 ◽  
Author(s):  
Rahman Beiranvand ◽  
Mohammad G. Dekamin
Keyword(s):  
Active Sites ◽  
Simple Procedure ◽  
Xrd Analysis ◽  
Significant Loss ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Trimesic Acid ◽  
Mild Conditions ◽  
Hantzsch Condensation

Abstract Trimesic acid-functionalized chitosan (Cs/ECH-TMA) material was prepared through a simple procedure by using chitosan (Cs), epichlorohydrin (ECH) and trimesic acid (TMA). The obtained bio-based Cs/ECH-TMA material was characterized using energy-dispersive X-ray (EDX) and Fourier-transform infrared spectroscopy (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) analysis. The Cs/ECH-TMA material was successfully used, as a multifunctional heterogeneous and sustainable catalyst, for efficient and expeditious synthesis of medicinally important polyhydroquinoline (PHQ) and polyhydroacridinedione (PHA) scaffolds through the Hantzsch condensation in a one-pot reaction. Indeed, the heterogeneous Cs/ECH-TMA material can be considered as a synergistic multifunctional organocatalyst due to the presence of a large number of acidic active sites in its structure as well as hydrophilicity. Both PHQs and PHAs were synthesized in the presence of biodegradable heterogeneous Cs/ECH-TMA catalytic system from their corresponding substrates in EtOH under reflux conditions and high to quantitative yields. The Cs/ECH-TMA catalyst is recyclable and can be reused at least four times without significant loss of its catalytic activity.

Simplified preparation of graphene-co-shelled Ni/NiO@C nano-catalyst and its application in the N-di-methylation synthesis of amines under mild conditions

2021 ◽  
Author(s):  
Jianguo Liu ◽  
Yanpei Song ◽  
Xiuzheng Zhuang ◽  
Mingyue Zhang ◽  
Longlong Ma
Keyword(s):  
Heterogeneous Catalyst ◽  
Important Goal ◽  
Mild Conditions ◽  
Organic Syntheses ◽  
Nano Catalyst ◽  
Earth Abundant

The development of Earth-abundant reusable and no-toxic heterogeneous catalyst applied in the pharmaceutically, bio-active relevant compounds synthesis as well as other organic syntheses still remains as the most important goal...

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

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