Silica sulfuric acid-catalyzed expeditious environment-friendly hydrolysis of carboxylic acid esters under microwave irradiation

2008 ◽  
Vol 62 (6) ◽  
Author(s):  
Zheng Li ◽  
Jing Liu ◽  
Xue Gong ◽  
Xuerong Mao ◽  
Xiunan Sun ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Carboxylic Acid ◽  
Microwave Irradiation ◽  
High Yield ◽  
Silica Sulfuric Acid ◽  
Environment Friendly ◽  
Acid Catalyzed ◽  
Work Up ◽  
Hydrolysis Of ◽  
Acid Esters

AbstractSilica sulfuric acid was found to be an efficient, recoverable, reusable and environment-friendly catalyst for the fast hydrolysis of various carboxylic acid esters in high conversions and selectivities under microwave irradiation conditions. This protocol has the advantages of no corrosion, no environmental pollution, high reaction rate, high yield, and simple work-up procedure.

Isocarbostyrils. II. The Conversion of 2-Methyl-4-acyl-5-nitroisocarbostyrils to 2-Substituted Indole-4-carboxylic Acids

1971 ◽  
Vol 49 (17) ◽  
pp. 2797-2802 ◽  
Author(s):  
D. E. Horning ◽  
G. Lacasse ◽  
J. M. Muchowski
Keyword(s):  
Sulfuric Acid ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Alkaline Hydrolysis ◽  
Mannich Reaction ◽  
Reductive Cyclization ◽  
Acid Catalyzed ◽  
Acid Anhydrides ◽  
Hydrolysis Of ◽  
Derivatives Of

The sulfuric acid catalyzed acylation of 2-methyl-5-nitroisocarbostyril with carboxylic acid anhydrides gave the corresponding 4-acylated derivatives 3, which underwent reductive cyclization to 2-substituted derivatives of 4-methyl-1,3,4,5-tetrahydropyrrolo[4.3.2.de]isoquinolin-5-one (4). Alkaline hydrolysis of the six-membered lactam in 4 was accompanied by a retro-Mannich reaction to produce 2-substituted indole-4-carboxylic acids in about 40 % overall yield from 3.

Nano-silica sulfuric acid catalyzed the efficient synthesis of 1,3,5-triarylbenzenes under microwave irradiation

2012 ◽  
Vol 9 (5) ◽  
pp. 791-798 ◽  
Author(s):  
R. Ghanbaripour ◽  
I. Mohammadpoor-Baltork ◽  
M. Moghadam ◽  
A. R. Khosropour ◽  
S. Tangestaninejad ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Microwave Irradiation ◽  
Efficient Synthesis ◽  
Silica Sulfuric Acid ◽  
Nano Silica ◽  
Acid Catalyzed

Improved synthesis of anti-sesquinorbornene

1984 ◽  
Vol 62 (9) ◽  
pp. 1840-1844 ◽  
Author(s):  
Karl R. Kopecky ◽  
Alan J. Miller
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Carboxylic Acid ◽  
Lead Tetraacetate ◽  
Carboxyl Group ◽  
Silver Acetate ◽  
Benzenesulfonyl Chloride ◽  
Methoxide Ion ◽  
Hydrolysis Of ◽  
Monomethyl Ester

Treatment of methyl hydrogen decahydro-1,4:5,8-exo,endo-dimethanonaphthalene-4a,8a-dicarboxylate with lead tetraacetate in benzene – acetic acid replaces the carboxyl group by an acetoxy group. Hydrolysis of this product with 25% sulfuric acid at 130 °C forms 8a-hydroxydecahydro-1,4:5,8-exo,endo-dimethanonaphthalene-4a-carboxylic acid 10. The reaction between 10 and benzenesulfonyl chloride in pyridine containing triethylamine at 95 °C produces anti-sesquinorbornene 1 in 34% yield. In the absence of triethylamine 1 is converted to the hydrochloride. The iodohydroperoxide of 1 is converted by silver acetate at 0 °C to the diketone in a luminescent reaction. The 1,2-dioxetane could not be isolated. Decahydro-1,4:5,8-exo,exo-dimethanonaphthalene-4a,8a-dicarboxylic anhydride is converted slowly by methoxide ion in methanol at 150 °C to the monomethyl ester which then undergoes demethylation. The isomeric exo,endo anhydride undergoes reaction readily with methoxide ion at 80 °C.

Micelle Catalyzed Hydrolysis of Carboxylic Acid Esters in Water–β‐Cyclodextrin–Cetyltrimethylammonium Bromide Systems

2003 ◽  
Vol 24 (1) ◽  
pp. 97-101 ◽  
Author(s):  
Jiaqing Xie ◽  
Yi Zhang ◽  
Juan Du ◽  
Xian‐cheng Zeng ◽  
Ying‐jin Liu ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Cetyltrimethylammonium Bromide ◽  
Hydrolysis Of ◽  
Acid Esters

scholarly journals A Fast, Highly Efficient, and Green Protocol for Synthesis of Biscoumarins Catalyzed by Silica Sulfuric Acid Nanoparticles as a Reusable Catalyst

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Bahareh Sadeghi ◽  
Tayebe Ziya
Keyword(s):  
Sulfuric Acid ◽  
Aromatic Aldehyde ◽  
High Yield ◽  
Reusable Catalyst ◽  
Silica Sulfuric Acid ◽  
Green Protocol ◽  
Highly Efficient

Silica sulfuric acid nanoparticles have been prepared and shown to efficiently catalyse the reaction between an aromatic aldehyde or phenylglyoxal and a 4-hydroxycoumarin at reflux in EtOH to afford the biscoumarin derivatives in high yield.

Sign in / Sign up

Export Citation Format

Share Document