Kinetics of the Acid-catalyzed Hydrolysis of 4-(p-Sulfophenylazo)-1-naphthyl Methyl Ether and 4-(p-Sulfophenylazo)-anisole1

1961 ◽  
Vol 83 (5) ◽  
pp. 1117-1123 ◽  
Author(s):  
J. F. Bunnett ◽  
Erwin Buncel
Keyword(s):  
Methyl Ether ◽  
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

Storage Stability of Solvent-Free Condensates of Functionalized Trialkoxysilanes

1999 ◽  
Vol 576 ◽  
Author(s):  
S. Stein ◽  
St. Cramer V. Clausbruch ◽  
N. Moszner ◽  
V. Rheinberger Ivoclar Ag
Keyword(s):  
Methyl Ether ◽  
Storage Stability ◽  
Solvent Free ◽  
Residual Silanol Groups ◽  
Acid Catalyzed ◽  
Chemical Conditions ◽  
Degree Of Condensation ◽  
Hydrolysis Of ◽  
Initial Viscosity ◽  
Butyl Methyl Ether

ABSTRACTThe lack of storage stability of organic-inorganic solvent-free sols is a well-known problem. We investigated the influence of different solvents in the acid catalyzed hydrolysis of various sols on their storage stability. Our experiments were based on two different silanes, 3-methacryloxypropyltrimethoxysilane (MPTS) and 1,1,1-tris(allyloxymethyl)-l-[[[3-(triethoxysilyl)propyl]aminocarbonyl]oxymethyl]methane (silane 31), synthesized by reaction of pentaerythritol triallyl ether and 3-isocyanatopropyltriethoxysilane. The employed solvents were alcohol, tetrahydofuran and tert-butyl methyl ether in a range of 95 wt% to 30 wt% in solution. In order to get comparable chemical conditions the degree of condensation of the various sols were adjusted between 75% and 85%. Furthermore, the sols were modified by silylation with trimethylchlorosilane. A comparison of silylated and not silylated silane 31 clearly showed that a decrease in residual silanol groups increase the storage stability. The results of the investigations demonstrated that both the kind and the amount of solvent used in hydrolysis affects the initial viscosity of solvent-free condensates of silane 31 and MPTS.

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 the hydrolysis of pyridoxine 4'-methyl ether hydrochloride

1979 ◽  
Vol 13 (9) ◽  
pp. 929-934
Author(s):  
A. A. Efremenko ◽  
M. V. Balyakina ◽  
T. M. Filippova ◽  
T. M. Konopleva ◽  
I. G. Suchkova ◽  
...  
Keyword(s):  
Methyl Ether ◽  
Kinetics Of ◽  
Hydrolysis Of
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