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.

ChemInform Abstract: Silica Sulfuric Acid Mediated Acylation of Amines with 1,3-Diketones via C-C Bond Cleavage under Solvent-Free Conditions.

ChemInform ◽  
2016 ◽  
Vol 47 (8) ◽  
pp. no-no
Author(s):  
Ruiqiang Guo ◽  
Chuanlei Zhu ◽  
Zhe Sheng ◽  
Yanzhe Li ◽  
Wei Yin ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Bond Cleavage ◽  
Solvent Free ◽  
Silica Sulfuric Acid ◽  
Solvent Free Conditions

scholarly journals Silica sulfuric acid: a reusable solid catalyst for one pot synthesis of densely substituted pyrrole-fused isocoumarins under solvent-free conditions

2013 ◽  
Vol 9 ◽  
pp. 2344-2353 ◽  
Author(s):  
Sudipta Pathak ◽  
Kamalesh Debnath ◽  
Animesh Pramanik
Keyword(s):  
Sulfuric Acid ◽  
Low Cost ◽  
Solvent Free ◽  
Primary Amines ◽  
Solid Catalyst ◽  
Silica Sulfuric Acid ◽  
Reaction Conditions ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Solvent Free Reaction

A convenient and efficient methodology for the synthesis of densely substituted pyrrole-fused isocoumarins, which employs solid-supported silica sulfuric acid (SSA) as catalyst, has been developed. When the mixture of ninhydrin adducts of acetylacetone/ethyl acetoacetate and primary amines was heated on the solid surface of SSA under solvent-free conditions, the pyrrole-fused isocoumarins were formed in good yields. This synthetic method has several advantages such as the employment of solvent-free reaction conditions without the use of any toxic reagents and metal catalysts, the ease of product isolation, the use of a recyclable catalyst, the low cost, the easy availability of the starting materials, and the excellent yields of products.

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.

Silica sulfuric acid as an efficient and recyclable catalyst for the methoxymethylation of alcohols under solvent-free conditions

2006 ◽  
Vol 7 (7) ◽  
pp. 494-498 ◽  
Author(s):  
Khodabakhsh Niknam ◽  
Mohammad Ali Zolfigol ◽  
Ahmad Khorramabadi-Zad ◽  
Reza Zare ◽  
Mohsen Shayegh
Keyword(s):  
Sulfuric Acid ◽  
Recyclable Catalyst ◽  
Solvent Free ◽  
Silica Sulfuric Acid ◽  
Solvent Free Conditions

Rapid and efficient diazotization and diazo coupling reactions on silica sulfuric acid under solvent-free conditions

2009 ◽  
Vol 81 (3) ◽  
pp. 240-244 ◽  
Author(s):  
A ZAREI ◽  
A HAJIPOUR ◽  
L KHAZDOOZ ◽  
B MIRJALILI ◽  
A NAJAFICHERMAHINI
Keyword(s):  
Sulfuric Acid ◽  
Solvent Free ◽  
Coupling Reactions ◽  
Silica Sulfuric Acid ◽  
Solvent Free Conditions ◽  
Diazo Coupling
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