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.

scholarly journals N-Formylation of Anilines with Silica Sulfuric Acid under Solvent-Free Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Davood Habibi ◽  
Payam Rahmani ◽  
Ziba Akbaripanah
Keyword(s):  
Sulfuric Acid ◽  
Formic Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Secondary Amines ◽  
Silica Sulfuric Acid ◽  
Excellent Yield ◽  
Solvent Free Conditions ◽  
Primary And Secondary Amines

N-formylation of primary and secondary amines was carried out with formic acid in the presence of silica sulfuric acid under solvent-free conditions to give the corresponding formamides in excellent yield and short reaction times.

Mixed er-NHC/phosphine Pd(ii) complexes and their catalytic activity in the Buchwald–Hartwig reaction under solvent-free conditions

2019 ◽  
Vol 48 (10) ◽  
pp. 3447-3452 ◽  
Author(s):  
Alexandra A. Ageshina ◽  
Grigorii K. Sterligov ◽  
Sergey A. Rzhevskiy ◽  
Maxim A. Topchiy ◽  
Gleb A. Chesnokov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Solvent Free ◽  
Secondary Amines ◽  
Solvent Free Conditions ◽  
Primary And Secondary Amines

A single catalyst for solvent-free Buchwald–Hartwig amination with both primary and secondary amines.

Efficient thioacetalisation of carbonyl compounds

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Davood Habibi ◽  
Payam Rahmani ◽  
Ziba Akbaripanah
Keyword(s):  
Reaction Time ◽  
Heterogeneous Catalyst ◽  
Sulphuric Acid ◽  
Silica Gel ◽  
Carbonyl Compounds ◽  
Solvent Free ◽  
Short Reaction Time ◽  
Solvent Free Conditions ◽  
Derivatives Of ◽  
Efficient Heterogeneous Catalyst

AbstractThe thioacetalisation of a variety of heterocyclic, aromatic, and aliphatic carbonyl compounds (1 mmol) with ethane-1,2-dithiol (1 mmol) using silica sulphuric acid (SSA) is presented as an efficient heterogeneous catalyst under mild and solvent-free conditions at 60°C. The thioacetals were formed within a short reaction time (1–34 min) and isolated with 90–98 % yield following an extractive procedure and chromatography on silica gel. The competitive protection reaction between aldehyde and ketone with ethane-1,2-dithiol afforded the protected derivatives of benzaldehyde and acetophenone with 92 % and 8 % yields, respectively, indicating some selectivity.

scholarly journals Microwave-assisted Aminolysis of Epoxides under Solvent-free Conditions Catalyzed by Montmorillonite Clay

1999 ◽  
Vol 23 (2) ◽  
pp. 128-129
Author(s):  
Mohammad M. Mojtahedi ◽  
Mohammad R. Saidi ◽  
Mohammad Bolourtchian
Keyword(s):  
Microwave Irradiation ◽  
Amino Alcohols ◽  
Solvent Free ◽  
Montmorillonite Clay ◽  
Secondary Amines ◽  
Microwave Assisted ◽  
Montmorillonite K10 ◽  
Solvent Free Conditions ◽  
Primary And Secondary Amines ◽  
High Yields

The reaction of primary and secondary amines with epoxides in the presence of montmorillonite K10 clay, under solvent-free condtions and microwave irradiation affords high yields of β-amino alcohols.

scholarly journals Tandem Fries Reaction–Conjugate Addition under Microwave Irradiation in Dry Media; One-pot Synthesis of Flavanones

1999 ◽  
Vol 23 (9) ◽  
pp. 574-575
Author(s):  
Firouz Matloubi Moghaddam ◽  
Mohammad Ghaffarzadeh ◽  
Seyed Hossein Abdi-Oskoui
Keyword(s):  
Microwave Irradiation ◽  
Silica Gel ◽  
Conjugate Addition ◽  
Solvent Free ◽  
Naphthalene Derivatives ◽  
One Pot ◽  
Fries Rearrangement ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Fries Reaction

An AICl3–ZnCl2 mixture supported on silica gel is found to be an efficient medium for the Fries rearrangement of acyloxybenzene or naphthalene derivatives in solvent-free conditions under microwave irradiation.

A green and novel method for synthesis of β-sulfonyl esters under solvent-free conditions

2021 ◽  
pp. 1-10
Author(s):  
Gholamhassan Imanzadeh ◽  
Havva Rezaei ◽  
Roghayyeh Asgharzadeh ◽  
Zahra Soltanzadeh
Keyword(s):  
Solvent Free ◽  
Solvent Free Conditions ◽  
Novel Method

Direct amidation of carboxylic acids with amines under microwave irradiation using silica gel as a solid support

2015 ◽  
Vol 17 (5) ◽  
pp. 3157-3163 ◽  
Author(s):  
Andrea Ojeda-Porras ◽  
Alejandra Hernández-Santana ◽  
Diego Gamba-Sánchez
Keyword(s):  
Fatty Acids ◽  
Microwave Irradiation ◽  
Carboxylic Acids ◽  
Silica Gel ◽  
Solid Support ◽  
Secondary Amines ◽  
Primary And Secondary Amines ◽  
Direct Amidation

A highly improved methodology for the direct amidation of carboxylic acids with amines using silica gel as a solid support and catalyst is described. Several examples using aliphatic, aromatic, unsaturated and fatty acids combined with primary and secondary amines are shown.

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