11-Deoxycorticosterone. The Aqueous Sulfuric Acid Hydrolysis of 21-Diazoprogesterone

1955 ◽  
Vol 77 (4) ◽  
pp. 1055-1056 ◽  
Author(s):  
Charles G. Salem ◽  
W. Werner Zorbach
Keyword(s):  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Aqueous Sulfuric Acid ◽  
Hydrolysis Of

Thiohydantoins. X. Kinetic Studies of the Acid Hydrolysis of 1-Acyl-2-thiohydantoins

1972 ◽  
Vol 50 (23) ◽  
pp. 3767-3779 ◽  
Author(s):  
Wayne Irvine Congdon ◽  
John Thomas Edward
Keyword(s):  
Sulfuric Acid ◽  
Carboxylic Acid ◽  
Acid Hydrolysis ◽  
Kinetic Studies ◽  
Steric Effects ◽  
Aqueous Sulfuric Acid ◽  
Hydrolysis Of

The rates of hydrolysis of 22 1-acyl-2-thiohydantoins in aqueous sulfuric acid to give 2-thiohydantoin and a carboxylic acid have been determined. In 0–90% sulfuric acid, hydrolysis takes place by an A-2 mechanism, and the rate reaches a maximum in about 70% acid. In acid more concentrated than about 90%, hydrolysis takes place by an A-1 mechanism, and the rate increases monotonically. Evidence for the two mechanisms comes from Yates r and Bunnett-Olsen [Formula: see text] parameters; from entropies of activation; from pσ and pσ+ relations; and from steric effects.

scholarly journals Optimized acid hydrolysis of the polysaccharides from the seaweed Solieria filiformis (Kützing) P.W. Gabrielson for bioethanol production

2017 ◽  
Vol 39 (4) ◽  
pp. 423 ◽  
Author(s):  
George Meredite Cunha de Castro ◽  
Norma Maria Barros Benevides ◽  
Maulori Curié Cabral ◽  
Rafael De Souza Miranda ◽  
Enéas Gomes Filho ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Kinetic Parameters ◽  
Renewable Resource ◽  
Bioethanol Production ◽  
Seaweed Species ◽  
Mild Conditions ◽  
Hydrolysis Of ◽  
Solieria Filiformis

 The seaweeds are bio-resource rich in sulfated and neutral polysaccharides. The tropical seaweed species used in this study (Solieria filiformis), after dried, shows 65.8% (w/w) carbohydrate, 9.6% (w/w) protein, 1.7% (w/w) lipid, 7.0% (w/w) moisture and 15.9% (w/w) ash. The dried seaweed was easily hydrolyzed under mild conditions (0.5 M sulfuric acid, 20 min.), generating fermentable monosaccharides with a maximum hydrolysis efficiency of 63.21%. Galactose and glucose present in the hydrolyzed were simultaneously fermented by Saccharomyces cerevisiae when the yeast was acclimated to galactose and cultivated in broth containing only galactose. The kinetic parameters of the fermentation of the seaweed hydrolyzed were Y(P⁄S) = 0.48 ± 0.02 g.g−1, PP = 0.27 ± 0.04 g.L−1.h−1, h = 94.1%, representing a 41% increase in bioethanol productivity. Therefore, S. filiformis was a promising renewable resource of polysaccharides easily hydrolyzed, generating a broth rich in fermentable monosaccharides for ethanol production. 

scholarly journals Two-stage, dilute sulfuric acid hydrolysis of wood : an investigation of fundamentals

1985 ◽  
Author(s):  
John F. Harris ◽  
Andrew J. Baker ◽  
Anthony H. Conner ◽  
Thomas W. Jeffries ◽  
James L. Minor ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Two Stage ◽  
Dilute Sulfuric Acid ◽  
Hydrolysis Of

Evaluation of the Kinetics of Xylose Formation from Dilute Sulfuric Acid Hydrolysis of Forest Residues ofEucalyptusgrandis

2007 ◽  
Vol 46 (7) ◽  
pp. 1938-1944 ◽  
Author(s):  
Eliana V. Canettieri ◽  
George J. M. Rocha ◽  
João A. Carvalho, ◽  
João B. A. Silva
Keyword(s):  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Forest Residues ◽  
Dilute Sulfuric Acid ◽  
Kinetics Of ◽  
Hydrolysis Of

Dilute sulfuric acid hydrolysis of tropical region biomass

2012 ◽  
Vol 4 (2) ◽  
pp. 021201 ◽  
Author(s):  
I. P. Hernández ◽  
José A. Pérez-Pimienta ◽  
Sarah Messina ◽  
Claudia E. Saldaña Durán
Keyword(s):  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Tropical Region ◽  
Dilute Sulfuric Acid ◽  
Hydrolysis Of

scholarly journals Effect of Dilute Sulfuric Acid Hydrolysis of Coconut Dregs on Chemical and Thermal Properties

2013 ◽  
Vol 68 ◽  
pp. 372-378 ◽  
Author(s):  
Normah Bujang ◽  
Miradatul Najwa Muhd Rodhi ◽  
Mohibah Musa ◽  
Fuzieah Subari ◽  
Norazlina Idris ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Dilute Sulfuric Acid ◽  
Hydrolysis Of

scholarly journals Conformational-dependent reaction mechanism: case of acid hydrolysis of N-benzoyl-9-azabicyclo[6.1.0]non-4-ene

2017 ◽  
Vol 95 (1) ◽  
pp. 37-44 ◽  
Author(s):  
Djallila Missaoui ◽  
Ali Rahmouni ◽  
Okkacha Bensaid ◽  
Néji Besbes
Keyword(s):  
Sulfuric Acid ◽  
Reaction Mechanism ◽  
Acid Hydrolysis ◽  
Gas Phase ◽  
Quantum Chemical ◽  
Basis Sets ◽  
Stable Conformer ◽  
Chemical Studies ◽  
Quantum Chemical Studies ◽  
Hydrolysis Of

Quantum chemical studies of the acid hydrolysis of cis-cis-N-benzoyl-9-azabicyclo[6.1.0]non-4-ene in gas phase and sulfuric acid solution have been carried out. Conformational analysis of reactant and intermediates were done at DFT level of calculations, using different basis sets. Transition states were identified and IRC calculations were done at the same level. In the first step of the reaction, the protonation occurs preferentially on the nitrogen atom. Three products are obtained. The type of mechanism, stepwise or concerted, depends on the stable conformers and the cleaved N–C bond. The main conclusion is that the products of the reaction depend on the nature of the stable conformer of the reactant.

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