scholarly journals A rapid and efficient synthetic route to terminal arylacetylenes by tetrabutylammonium hydroxide- and methanol-catalyzed cleavage of 4-aryl-2-methyl-3-butyn-2-ols

2011 ◽  
Vol 7 ◽  
pp. 426-431 ◽  
Author(s):  
Jie Li ◽  
Pengcheng Huang
Keyword(s):  
Reaction Time ◽  
Active Catalyst ◽  
Catalyst System ◽  
Synthetic Route ◽  
Reaction Conditions ◽  
Tetrabutylammonium Hydroxide ◽  
Highly Active ◽  
Novel Catalyst ◽  
Usual Reaction

Tetrabutylammonium hydroxide with methanol as an additive was found to be a highly active catalyst for the cleavage of 4-aryl-2-methyl-3-butyn-2-ols. The reaction was performed at 55–75 °C and gave terminal arylacetylenes in good to excellent yields within several minutes. Compared with the usual reaction conditions (normally >110 °C, several hours), this novel catalyst system can dramatically decrease the reaction time under much milder conditions.

Synthesis and characterization of γ-Fe2O3@SiO2–(CH2)3–PDTC–Pd magnetic nanoparticles: a new and highly active catalyst for the Heck/Sonogashira coupling reactions

2019 ◽  
Vol 43 (23) ◽  
pp. 8930-8938 ◽  
Author(s):  
Zahra Tashrifi ◽  
Saeed Bahadorikhalili ◽  
Hossein Lijan ◽  
Samira Ansari ◽  
Haleh Hamedifar ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Active Catalyst ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Highly Active ◽  
Novel Catalyst

A novel catalyst is synthesized based on the immobilization of palladium on γ-Fe2O3@SiO2–(CH2)3–PDTC nanoparticles and is used as a highly active catalyst for the Heck/Sonogashira coupling reactions.

Catalytic Application of H4SiW12O40/SiO2 in Synthesis of Acetals and Ketals

2011 ◽  
Vol 284-286 ◽  
pp. 2374-2379 ◽  
Author(s):  
Shui Jin Yang ◽  
Yong Kui Huang ◽  
Li Yu
Keyword(s):  
Reaction Time ◽  
High Activity ◽  
Sol Gel ◽  
Reaction Parameters ◽  
Reaction Conditions ◽  
Catalytic Application ◽  
Ft Ir ◽  
Gel Technique ◽  
Catalyst Dosage ◽  
Novel Catalyst

A novel catalyst, H4SiW12O40/SiO2was synthesized by a sol-gel technique, and characterized by FT-IR and XRD. Catalytic application of H4SiW12O40/SiO2for synthesis of acetals and ketals were tested. The variation of different reaction parameters, such as mole ratio of aldehyde/ketone to alcohols, catalyst dosage and reaction time on the yield of acetals and ketals were also studied. The results reveal that the H4SiW12O40/SiO2catalysis generally results in good yields of acetals and ketals under mild reaction conditions and the high activity and stability of the catalyst is well retained on recycling.

A Highly Active Catalyst System for Intermolecular Hydroacylation

2000 ◽  
Vol 39 (17) ◽  
pp. 3070-3072 ◽  
Author(s):  
Chul-Ho Jun ◽  
Dae-Yon Lee ◽  
Hyuk Lee ◽  
Jun-Bae Hong
Keyword(s):  
Active Catalyst ◽  
Catalyst System ◽  
Highly Active

scholarly journals Microwave Assisted One Pot Synthesis of 3,4-Dihydropyrano[c]chromene Derivatives using [Emim]OH Ionic Liquid as Novel Catalyst

2019 ◽  
Vol 31 (4) ◽  
pp. 829-833
Author(s):  
D.S. Bhagat ◽  
S.G. Pande ◽  
M.V. Katariya ◽  
R.P. Pawar ◽  
P.S. Kendrekar
Keyword(s):  
Ionic Liquid ◽  
Reaction Time ◽  
High Yield ◽  
Reaction Conditions ◽  
One Pot ◽  
Short Reaction Time ◽  
Aryl Aldehydes ◽  
Microwave Assisted ◽  
Novel Catalyst ◽  
Work Up

One-pot efficient protocol to the synthesis of 2-amino-5-oxo-4,5-dihydropyrano(3,2-c)chromene-3-carbonitrile derivatives via condensation of various aryl aldehydes, dicyanomethane and 4-hydroxycoumarin in presence of Emim hydroxide as an excellent homogeneous liquid catalyst. The key advantages of this methodology are mild reaction conditions, novel catalyst, short reaction time, eco-friendly, easy work-up procedure and high yield of isolation of derivatives.

Magnetic NiO nanoparticles confined within open ends MWCNTs: a novel and highly active catalyst for hydrogenation and synthesis of imines

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58805-58812 ◽  
Author(s):  
Gangquan Chen ◽  
Wenbin Gao ◽  
Xuejun Wang ◽  
Hongfei Huo ◽  
Wenzhu Li ◽  
...  
Keyword(s):  
Active Catalyst ◽  
The Novel ◽  
Nio Nanoparticles ◽  
Highly Active ◽  
Novel Catalyst

The novel catalyst is highly active for hydrogenation and synthesis of imines.

VanadiumV(salen) catalysed synthesis of oxazolidinones from epoxides and isocyanates

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31345-31352 ◽  
Author(s):  
Christopher Beattie ◽  
Michael North
Keyword(s):  
Active Catalyst ◽  
Tetrabutylammonium Bromide ◽  
Catalyst System ◽  
Highly Active ◽  
Salen Complex

The combination of a vanadiumV(salen) complex V+O(salen) EtOSO3− and tetrabutylammonium bromide forms a highly active catalyst system for the reaction between epoxides and isocyanates leading to oxazolidinones.

A Highly Active Catalyst System for the Heteroarylation of Acetone.

ChemInform ◽  
2004 ◽  
Vol 35 (10) ◽  
Author(s):  
Ping Liu ◽  
Thomas J. Jr. Lanza ◽  
James P. Jewell ◽  
Carrie P. Jones ◽  
William K. Hagmann ◽  
...  
Keyword(s):  
Active Catalyst ◽  
Catalyst System ◽  
Highly Active

N,O-ligated Pd(ii) complexes for catalytic alcohol oxidation

2014 ◽  
Vol 4 (8) ◽  
pp. 2526-2534 ◽  
Author(s):  
Laura M. Dornan ◽  
Gráinne M. A. Clendenning ◽  
Mateusz B. Pitak ◽  
Simon J. Coles ◽  
Mark J. Muldoon
Keyword(s):  
Crystal Structure ◽  
Sulfonic Acid ◽  
Active Catalyst ◽  
Alcohol Oxidation ◽  
Secondary Alcohols ◽  
Reaction Conditions ◽  
Highly Active

The (HSA)Pd(OAc)2 complex (where HSA = 8-hydroxyquinoline-2-sulfonic acid) is a highly active catalyst for the oxidation of a range of secondary alcohols in 4–6 hours at a low loading of 0.5 mol%. The crystal structure has been obtained and the influence of reaction conditions on catalyst degradation was also examined.

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