Tunable Fabrication of NiAl‐LDHs Containing Acid Activity Sites as Green Catalyst for Acetalization of Furfural to Furfural Diethyl Acetal

2018 ◽  
Vol 3 (27) ◽  
pp. 7996-8002 ◽  
Author(s):  
Yali Du ◽  
Xuezhen Liu ◽  
Xu Wu ◽  
Qiangqiang Cheng ◽  
Chao Ci ◽  
...  
Keyword(s):  
Diethyl Acetal ◽  
Green Catalyst

Ipso-Hydroxylation of Aryl/Heteroarylboronic Acids Using WEBPA as a Green Catalyst

2017 ◽  
Vol 13 (10) ◽  
pp. 764-769 ◽  
Author(s):  
Eramoni Saikia ◽  
Bolin Chetia ◽  
Sankar Bora
Keyword(s):  
Green Catalyst

Full Kinetics and a Mechanism Investigation for the Generation of 4- Substituted 1, 4-Dihydropyridine Derivatives in the Presence of Green Catalyst and Aqueous Medium: Experimental Procedure

2020 ◽  
Vol 17 ◽  
Author(s):  
Sayyed Mostafa Habibi-Khorassani ◽  
Mehdi Shahraki ◽  
Sadegh Talaiefar
Keyword(s):  
Reaction Mechanism ◽  
Reaction Centre ◽  
Green Catalyst ◽  
Experimental Procedure ◽  
Dominant Mechanism ◽  
Rate Determining Step ◽  
12 Steps ◽  
Reaction Constant ◽  
Substituted 1 ◽  
Dihydropyridine Derivatives

Aims and Objective: The main objective of the kinetic investigation of the reaction among ethyl acetoacetate 1, ammoniumacetat 2, dimedone 3 and diverse substitutions of benzaldehyde 4-X, (X= H, NO2, CN, CF3, Cl, CH (CH3)2, CH3, OCH3, OCH3, and OH) for the generation of 4-substituted 1, 4-dihydropyridine derivatives (product 5) was the recognition of the most realistic reaction mechanism. The layout of the reaction mechanism studied kinetically by means of the UV-visible spectrophotometry approach. Materials and Methods: Among the various mechanisms, only mechanism1 (path1) involving 12 steps was recognized as a dominant mechanism (path1). Herein, the reaction between reactants 1 and 2 (kobs= 814.04 M-1 .min-1 ) and also compound 3 and 4-H (kobs= 151.18 M-1 .min-1 ) were the logical possibilities for the first and second fast steps (step1 and step2, respectively). Amongst the remaining steps, only step9 of the dominant mechanism (path1) had substituent groups (X) near the reaction centre that could be directly resonated with it. Results and Discussion: Para electron-withdrawing or donating groups on the compound 4-X increases the rate of the reaction 4 times more or decreases 8.7 times less than the benzaldehyde alone. So, this step is sensitive for monitoring any small or huge changes in the reaction rate. For this reason, step9 is the rate-determining step of the reaction mechanism (path1). Conclusion: The recent result is the agreement with the Hammett description with an excellent dual substituent factor (r = 0.990) and positive value of reaction constant (ρ = +0.9502) which confirmed both the resonance and inductive effects “altogether” contributed on the reaction centre of step9 in the dominant mechanism (path1).

DMF. I2 Complex as Efficient Green Catalyst in the Diels-alder Reaction of Anthracene-9-Methanol with Maleimide

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Urbain C. Kassehin ◽  
Sèdami M. Fagla ◽  
Fernand A. Gbaguidi ◽  
Julien R. C. Prevost ◽  
Raphaël Frédérick ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Green Catalyst ◽  
Diels Alder Reaction

scholarly journals Synthesis of 9-(4-bromophenyl)-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione using lime and lemon juice as a green catalyst and its antioxidant activity

2021 ◽  
Author(s):  
Rini Retnosari ◽  
Anita Lestari ◽  
Siti Marfu’ah ◽  
Aman Santoso ◽  
Dedek Sukarianingsih ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Lemon Juice ◽  
Green Catalyst

Application of Activated Bentonite Impregnated with PdO as Green Catalyst for Acylation Reaction of Aromatic Compounds

2021 ◽  
pp. 105508
Author(s):  
Yehezkiel Steven Kurniawan ◽  
Arif Cahyo Imawan ◽  
Yoeretisa Miggia Stansyah ◽  
Tutik Dwi Wahyuningsih
Keyword(s):  
Aromatic Compounds ◽  
Acylation Reaction ◽  
Green Catalyst ◽  
Activated Bentonite

scholarly journals Gum arabic-OPO3H2 as a new natural-based green catalyst for the one-pot pseudo-four-component synthesis of naphtho[1,2-e][1,3]oxazines

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40508-40513
Author(s):  
Sahar Saadat Hosseinikhah ◽  
Bi Bi Fatemeh Mirjalili ◽  
Naeimeh Salehi ◽  
Abdolahamid Bamoniri
Keyword(s):  
Gum Arabic ◽  
Phosphorus Pentoxide ◽  
One Pot ◽  
Green Catalyst ◽  
The One

Gum arabic-OPO3H2 (GA-OPO3H2) as a unique natural-based green catalyst was synthesized by the reaction of phosphorus pentoxide with gum arabic.

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