Kinetics of the Acid-catalyzed Hydrolysis of 1-Methoxy-3,5-dihydroxybenzene and 1,3,5-Trimethoxybenzene

1963 ◽  
Vol 85 (9) ◽  
pp. 1284-1289 ◽  
Author(s):  
W. M. Schubert ◽  
Rodney H. Quacchia
Keyword(s):  
Acid Catalyzed ◽  
Kinetics Of ◽  
Hydrolysis Of

Cyclization and acid-catalyzed hydrolysis of O-benzoylbenzamidoximes

1986 ◽  
Vol 51 (12) ◽  
pp. 2786-2797
Author(s):  
František Grambal ◽  
Jan Lasovský
Keyword(s):  
Reaction Rate ◽  
Kinetic Isotope ◽  
Acid Base Equilibrium ◽  
Mineral Acids ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Ph Scale ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

Kinetics of formation of 1,2,4-oxadiazoles from 24 substitution derivatives of O-benzoylbenzamidoxime have been studied in sulphuric acid and aqueous ethanol media. It has been found that this medium requires introduction of the Hammett H0 function instead of the pH scale beginning as low as from 0.1% solutions of mineral acids. Effects of the acid concentration, ionic strength, and temperature on the reaction rate and on the kinetic isotope effect have been followed. From these dependences and from polar effects of substituents it was concluded that along with the cyclization to 1,2,4-oxadiazoles there proceeds hydrolysis to benzamidoxime and benzoic acid. The reaction is thermodynamically controlled by the acid-base equilibrium of the O-benzylated benzamidoximes.

scholarly journals Effect of a Substituent in the Benzene Ring upon the Kinetics of Acid-Catalyzed Hydrolysis of exo-2-Norbornyl Phenyl Ether.

1997 ◽  
Vol 51 ◽  
pp. 515-520 ◽  
Author(s):  
Martti Lajunen ◽  
Marja Himottu ◽  
Kirsi Tanskanen-Lehti ◽  
Maamar Hamdi ◽  
Suzanne Fery-Forgues ◽  
...  
Keyword(s):  
Benzene Ring ◽  
Phenyl Ether ◽  
Acid Catalyzed ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetics of the acid-catalyzed hydrolysis of tetraethoxysilane (TEOS) by 29Si NMR spectroscopy and mathematical modeling

2018 ◽  
Vol 86 (2) ◽  
pp. 316-328 ◽  
Author(s):  
J. C. Echeverría ◽  
P. Moriones ◽  
G. Arzamendi ◽  
J. J. Garrido ◽  
M. J. Gil ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Nmr Spectroscopy ◽  
29Si Nmr ◽  
Acid Catalyzed ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
29Si Nmr Spectroscopy

Kinetics of acid-catalyzed hydrolysis of fluorinated propanoates

1983 ◽  
Vol 48 (10) ◽  
pp. 2805-2811 ◽  
Author(s):  
Oldřich Paleta ◽  
Jaroslav Kvíčala ◽  
Václav Dědek
Keyword(s):  
Rate Constants ◽  
Relative Rate ◽  
Chloride Concentration ◽  
Activation Entropy ◽  
High Activation ◽  
Isokinetic Relationship ◽  
Relative Rate Constants ◽  
Acid Catalyzed ◽  
Kinetics Of ◽  
Hydrolysis Of

Rates of hydrolysis, kH+, of methyl 2-chloro-2,3,3,3-tetrafluoro-(III), 2,3-dichloro-2,3,3-trifluoro-(IV), 2,2,3-trichloro-3,3-difluoro-(V), 2,3,3,3-tetrafluoro-(VI) and 3-chloro-2,3,3-trifluoropropanoate (VII) were measured in 0.5M-HCl in aqueous methanol (80% vol; 76% wt) at 40, 50 and 60 °C. The relative rate constants, krel (50 °C), (for the propanoate III, kH+ = 4.3 . 10-5 l mol-1 s-1; krel = 100) are 311, 100, 38, 9.4, 44 and 15 for the esters II, III, IV, V, VI and VII, respectively (experimental error ±9%). It was found that krel = αβ where α and β are the following factors for groups in the position 2 and 3: CClF 10, CHF 4.2, CCl2 2.8, CF3 10 and CClF2 3.6. The rate constants obey the isokinetic relationship. For the ester III the dependence of log kobs on logarithm of hydrogen chloride concentration is linear at concentrations 0.08-2.4 mol l-1 which, together with high activation entropy ΔS≠ for the esters III-VII (-167 to -217 J mol-1 K-1), shows that the hydrolysis proceeds by an AAC2 mechanism.

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