scholarly journals Synthesis of Some Aryl Chalcones Using Silica-Sulphuric Acid Reagent under Solvent Free Conditions

2007 ◽  
Vol 4 (1) ◽  
pp. 90-96 ◽  
Author(s):  
G. Thirunarayanan ◽  
G. Vanangamudi
Keyword(s):  
Spectral Data ◽  
Sulphuric Acid ◽  
Solvent Free ◽  
Unsaturated Ketones ◽  
Physical Constants ◽  
Solvent Free Conditions ◽  
Acid Reagent ◽  
Substituted Benzaldehydes

There are two series of α, β-unsaturated ketones derived form Biphenyl and 9H-Fluorenyl, and ketones with various substituted benzaldehydes under solvent free conditions using silica-sulphuric acid as a reagent in an oven. The catalyst silica is reusable and the yields of chalcones are more than 90%. These chalcones are characterized by physical constants and spectral data.

The Iron(III) Chloride Mediated 1,4-Addition of Mercaptans to α,β-Unsaturated Ketones and Esters under Solvent-Free Conditions.

ChemInform ◽  
2007 ◽  
Vol 38 (1) ◽  
Author(s):  
Cheng-Ming Chu ◽  
Wan-Ju Huang ◽  
Chaowei Lu ◽  
Pohsi Wu ◽  
Ju-Tsung Liu ◽  
...  
Keyword(s):  
Solvent Free ◽  
Unsaturated Ketones ◽  
Solvent Free Conditions

A One-Pot, Three-Component, Solvent-Free Synthesis of Novel 6H-Chromeno[3’,4’:5,6]Pyrido[2,3-d]Pyrimidine-Triones under Microwave Irradiation

2018 ◽  
Vol 42 (12) ◽  
pp. 604-607
Author(s):  
Loghman Firoozpour ◽  
Hoda Yahyavi ◽  
Ramona Ejtemaei ◽  
Setareh Moghimi ◽  
Alireza Foroumadi
Keyword(s):  
Microwave Irradiation ◽  
Efficient Method ◽  
Barbituric Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Substituted Benzaldehydes ◽  
High Yields ◽  
Solvent Free Synthesis

A green and efficient method for preparing novel heterocyclic systems is established through the reaction of differently substituted benzaldehydes, barbituric acid and 4-amino-2H-chromene-2-one under solvent-free conditions. This method affords 6H-chromeno[3’,4’:5,6] pyrido[2,3-d]pyrimidine-trione derivatives in high yields and short reaction times.

A simple and efficient one-pot synthesis of Hantzsch 1,4-dihydropyridines using silica sulphuric acid as a heterogeneous and reusable catalyst under solvent-free conditions

2011 ◽  
Vol 65 (6) ◽  
Author(s):  
Eskandar Kolvari ◽  
Mohammad Zolfigol ◽  
Nadiya Koukabi ◽  
Behzad Shirmardi-Shaghasemi
Keyword(s):  
Sulphuric Acid ◽  
Recyclable Catalyst ◽  
Solvent Free ◽  
Reusable Catalyst ◽  
One Pot ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Dihydropyridine Derivatives

AbstractA simple, inexpensive and efficient one-pot synthesis of 1,4-dihydropyridine derivatives under solvent-free conditions using silica sulphuric acid (SSA) as a heterogeneous and recyclable catalyst is reported.

scholarly journals Magnetic Fe3O4@silica sulfuric acid nanoparticles promoted regioselective protection/deprotection of alcohols with dihydropyran under solvent-free conditions

RSC Advances ◽  
2017 ◽  
Vol 7 (89) ◽  
pp. 56559-56565 ◽  
Author(s):  
Kalyani Rajkumari ◽  
Juri Kalita ◽  
Diparjun Das ◽  
Lalthazuala Rokhum
Keyword(s):  
Sulfuric Acid ◽  
Sulphuric Acid ◽  
Catalytic Amount ◽  
Solvent Free ◽  
Hydroxyl Groups ◽  
Silica Sulfuric Acid ◽  
Solvent Free Conditions ◽  
Magnetic Fe3o4

Protection (and deprotection) of hydroxyl groups via tetrahydropyranylation was carried out effectively using a catalytic amount of Fe3O4 supported silica sulphuric acid nanoparticles (Fe3O4@SiO2@SO3H) under solvent-free conditions.

Sulphuric acid immobilized on silica gel (H2SO4–SiO2) as an eco-friendly catalyst for transamidation

RSC Advances ◽  
2015 ◽  
Vol 5 (14) ◽  
pp. 10567-10574 ◽  
Author(s):  
Sk. Rasheed ◽  
D. Nageswar Rao ◽  
A. Siva Reddy ◽  
Ravi Shankar ◽  
Parthasarathi Das
Keyword(s):  
Sulphuric Acid ◽  
Silica Gel ◽  
Solvent Free ◽  
Secondary Amines ◽  
Solvent Free Conditions ◽  
Primary And Secondary Amines ◽  
Novel Method

A novel method of transamidation of carboxamides with amines using catalytic amounts of H2SO4–SiO2 under solvent-free conditions has been developed. The scope of the methodology has been demonstrated with primary and secondary amines.

Iodine-catalyzed Michael addition of mercaptans to α,β-unsaturated ketones under solvent-free conditions

2005 ◽  
Vol 46 (30) ◽  
pp. 4971-4974 ◽  
Author(s):  
Cheng-Ming Chu ◽  
Shijay Gao ◽  
M.N.V. Sastry ◽  
Ching-Fa Yao
Keyword(s):  
Michael Addition ◽  
Solvent Free ◽  
Unsaturated Ketones ◽  
Solvent Free Conditions

scholarly journals Solvent-Free Synthesis and Spectral Linearity of Some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta[b]thiophene-3-carboxamides

2013 ◽  
Vol 13 ◽  
pp. 160-174 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Statistical Analysis ◽  
Microwave Irradiation ◽  
Spectral Data ◽  
Chemical Shifts ◽  
Solvent Free ◽  
Nmr Chemical Shifts ◽  
Substituent Constants ◽  
Substituted Benzaldehydes ◽  
Solvent Free Synthesis ◽  
Spectral Group

Some (E)-2-(substituted benzylideneamino)-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta[b]thiophene-3-carboxamide derivatives have been synthesized by SiO2:H3PO4 catalyzed solvent-free condensation of 2-amino-N-(3-chloro-4-fluorophenyl)-hexahydro-2H-cyclopenta [b]thiophene-3-carboxamide and various substituted benzaldehydes in microwave irradiation. The yield of the imine-carboximido derivatives has been found to be more than 85 %. The purity of all imine-carboximido derivatives has been checked using their physical constants and spectral data. The spectral data of the imine-carboximido derivatives such as infrared ν (cm-1) of CO, NH, C-N, C-Cl, C-F, C=N, and the NMR chemical shifts (δ, ppm) of NH, CH, CO and C=N have been correlated with Hammett substituent constants, F and R parameters. From the results of statistical analysis, the effects of substituent on the above spectral group absorptions have been discussed.

scholarly journals Preheated Fly-Ash Catalyzed Cyclization of Chalcones: Synthesis of some Substituted Pyrazole-1-Carbothioamides and Spectral Correlations in 3-(3,4-Dichlorophenyl)-5-(Substituted Phenyl)-4,5-Dihydro-1H-Pyrazole-1-Carbothioamides

2013 ◽  
Vol 15 ◽  
pp. 18-34 ◽  
Author(s):  
Ganesamoorthy Thirunarayanan ◽  
K.G. Sekar
Keyword(s):  
Regression Analysis ◽  
Fly Ash ◽  
Linear Regression ◽  
Microwave Irradiation ◽  
Spectral Data ◽  
Linear Regression Analysis ◽  
Solvent Free ◽  
Physical Constants ◽  
Multi Linear Regression ◽  
Substituted 1

Some substituted 1-thiocarbomyl pyrazolines including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides using solvent-free preheated fly-ash catalyzed cyclization between chalcones and thiosemicarbazide microwave irradiation. The yields of these thiocarbomyl pyrazolines are more than 80%. The purities of these synthesised pyrazoline derivatives are checked by their physical constants and spectral data earlier reported in the literature. The spectral data of these 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-carbothioamides had been correlated, using single and multi-linear regression analysis.

Sign in / Sign up

Export Citation Format

Share Document