Palladium-modified functionalized cyclodextrin as an efficient and recyclable catalyst for reduction of nitroarenes

RSC Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 7950-7954 ◽  
Author(s):  
Yafei Guo ◽  
Jiuling Li ◽  
Fen Zhao ◽  
Guineng Lan ◽  
Liang Li ◽  
...  
Keyword(s):  
High Activity ◽  
Catalytic System ◽  
Sodium Borohydride ◽  
Room Temperature ◽  
Recyclable Catalyst

A kind of palladium-modified functionalized cyclodextrin catalytic system was synthesized and characterized. It showed high activity in the reduction of nitroarenes with the absence of sodium borohydride in water at room temperature.

Knoevenagel Condensations Catalyzed by New Oil Shale Recyclable Catalyst at Room Temperature and Assisted by Ultrasounds Irradiations

2021 ◽  
Vol 37 (6) ◽  
pp. 1295-1301
Author(s):  
Elmustapha Ennesyry ◽  
Fathallaah Bazi ◽  
Bahija Mounir ◽  
M’hammed Elkouali Elkouali ◽  
Hassan Hannache ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Catalytic System ◽  
Oil Shale ◽  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Recyclable Catalyst ◽  
Short Time

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.

scholarly journals Aluminium based binary catalytic system for the solvent free conversion of CO2 to carbonates with high activity and selectivity

RSC Advances ◽  
2018 ◽  
Vol 8 (20) ◽  
pp. 11145-11149 ◽  
Author(s):  
Ran Ma ◽  
Haojie Sun ◽  
Yuanzhi Cui
Keyword(s):  
High Activity ◽  
Catalytic System ◽  
Recyclable Catalyst ◽  
Solvent Free

A multifunctional aluminum based complex was employed as an efficient and recyclable catalyst for the synthesis of carbonates from CO2 and epoxides.

A highly efficient copper and ligand free protocol for the room temperature Sonogashira reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Ankur Gogoi ◽  
Anindita Dewan ◽  
Utpal Bora
Keyword(s):  
Catalytic System ◽  
Room Temperature ◽  
Sonogashira Reaction ◽  
Highly Efficient ◽  
Aryl Iodides ◽  
Ligand Free

A mild and efficient catalytic system based on PdCl2 and Na2SO4 has been developed for the Sonogashira reaction of aryl iodides at room temperature.

Electrochemical reduction of indigo by combination of sodium borohydride and copper salt

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiaoyan Li ◽  
MengQian Wang ◽  
Gang Wu ◽  
Jiming Yao
Keyword(s):  
Sodium Borohydride ◽  
Room Temperature ◽  
Reduction Potential ◽  
Copper Ion ◽  
Reduction Process ◽  
Divalent Copper ◽  
Content Type ◽  
Copper Sulfate Pentahydrate ◽  
Electrochemical Technology ◽  
Dyed Fabric

Purpose The purpose of this study is to improve the performance of sodium borohydride in reducing indigo at room temperature, the divalent copper ion complex was combined with electrochemical technology for the reduction of indigo by sodium borohydride. Design/methodology/approach According to the K/S value of the dyed cloth sample, find a more suitable ligand for the copper ion in the catholyte. Response surface analysis tests were performed to evaluate the effects of sodium borohydride concentration, sodium hydroxide concentration and copper sulfate pentahydrate concentration on the reduction potential of the dye solution and the K/S value of the dyed fabric samples. Findings Sodium gluconate was found to be a more suitable ligand for copper ions in catholyte. The effects of NaOH concentration as well as the interaction of NaBH4 and NaOH on the reduction potential of the catholyte and the K/S value of the dyed fabric samples were extremely significant. The optimal concentrations of NaBH4, NaOH and CuSO4•5H2O were 0.5, 2.5 and 0.65 g/L. In the case of the optimized condition, the absolute value of the reduction potential was 968, and the K/S value was 11.92, which is comparable with that of the conventional reduction process with sodium dithionite. Originality/value The divalent copper ion complex combined with electrochemical technology was applied in the process of reducing indigo with NaBH4 at room temperature.

scholarly journals Noble metal-free upgrading of multi-unsaturated biomass derivatives at room temperature: silyl species enable reactivity

2018 ◽  
Vol 20 (23) ◽  
pp. 5327-5335 ◽  
Author(s):  
Hu Li ◽  
Wenfeng Zhao ◽  
Wenshuai Dai ◽  
Jingxuan Long ◽  
Masaru Watanabe ◽  
...  
Keyword(s):  
Noble Metal ◽  
Catalytic System ◽  
Room Temperature ◽  
Metal Free

A simple and robust catalytic system is described for the controllable conversion of biomass-derived chemicals.

Reductions with sulfurated borohydrides. V. Reductions of ketones

1970 ◽  
Vol 48 (15) ◽  
pp. 2366-2371 ◽  
Author(s):  
J. M. Lalancette ◽  
A. Freche
Keyword(s):  
High Temperature ◽  
Carbonyl Group ◽  
Sodium Borohydride ◽  
Room Temperature ◽  
High Yield ◽  
High Yields ◽  
Very High

Ketones can be reduced with sulfurated sodium borohydride. Very high yield (≈90%) of the corresponding alcohol is obtained with the appropriate ratio of ketone and hydride at room temperature. The reaction is much influenced by the steric environment around the carbonyl group. At high temperature (65°) disulfides and tetrasulfides are produced. In some cases the structure of those sulfides have been established. Conjugated ketones can be reduced to the corresponding alcohols with very high yields.

Palladium-Schiff-base-silica framework as a robust and recyclable catalyst for Suzuki–Miyaura cross-coupling in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38085-38092 ◽  
Author(s):  
Tahshina Begum ◽  
Manoj Mondal ◽  
Pradip K. Gogoi ◽  
Utpal Bora
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Aqueous Media ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Recyclable Catalyst ◽  
Cross Coupling Reaction

A novel Pd@imine-SiO2 catalyst was prepared and found to exhibit excellent catalytic activity in a Suzuki-Miyaura cross-coupling reaction under aqueous media at room temperature.

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