Sulfoquinones in the hydrolysis of aryl esters of o- and p-hydroxyarenesulfonic acids in alkaline aqueous solutions of dioxane

1985 ◽  
Vol 50 (12) ◽  
pp. 2158-2165 ◽  
Author(s):  
Sergio Thea ◽  
Giorgio Cevasco ◽  
Giuseppe Guanti ◽  
Andrew Hopkins ◽  
Nasrin Kashefi-Naini ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of

Kinetic studies on the rate of hydrolysis of N-ethyl-N′-(dimethylaminopropyl)carbodiimide in aqueous solutions using mass spectrometry and capillary electrophoresis

2002 ◽  
Vol 310 (1) ◽  
pp. 122-124 ◽  
Author(s):  
Q Paula Lei ◽  
David H Lamb ◽  
Ron K Heller ◽  
Anthony G Shannon ◽  
Robert Ryall ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Capillary Electrophoresis ◽  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Rate Of Hydrolysis ◽  
Hydrolysis Of

THE WATER-SOLUBLE POLYSACCHARIDES OF DERMATOPHYTES: IV. GALACTOMANNANS I FROM TRICHOPHYTON GRANULOSUM, TRICHOPHYTON INTERDIGITALE, MICROSPORUM QUINCKEANUM, TRICHOPHYTON RUBRUM, AND TRICHOPHYTON SCHÖNLEINII

1965 ◽  
Vol 43 (1) ◽  
pp. 30-39 ◽  
Author(s):  
C. T. Bishop ◽  
M. B. Perry ◽  
F. Blank ◽  
F. P. Cooper
Keyword(s):  
Aqueous Solutions ◽  
Copper Complexes ◽  
Trichophyton Rubrum ◽  
Periodate Oxidation ◽  
Structural Features ◽  
Water Soluble ◽  
Major Constituent ◽  
Branch Points ◽  
Terminal Units ◽  
Hydrolysis Of

A group of polysaccharides, called galactomannans I, were precipitated as their insoluble copper complexes from aqueous solutions of the crude polysaccharides obtained from each of the organisms designated in the title. The five galactomannans I were homogeneous under conditions of electrophoresis and ultracentrifugation and had high positive specific rotations. The major constituent monosaccharide was D-mannose; amounts of D-galactose ranged from nil for the polysaccharide from T. rubrum to 13% for that from T. schönleinii. Methylation and hydrolysis of the five galactomannans I yielded varying amounts of the following: 2,3,5,6-tetra-O-methyl-D-galactose (not present in the products from T. rubrum), 2,3,4,6-tetra-O-methyl-D-mannose, 2,3,4-tri-O-methyl-D-mannose, 2,4,6-tri-O-methyl-D-mannose, 3,4-di-O-methyl-D-mannose, and 3,5-di-O-methyl-D-mannose. Periodate oxidation results agreed with the methylation studies. The gross structural features of each galactomannan I appear to be the same, namely, a basic chain of 1 → 6 linked α-D-mannopyranose units for approximately every 22 of which there is a 1 → 3 linked α-D-mannopyranose residue. Branch points occur along the 1 → 6 linked chain at the C2 positions of the D-mannopyranose units and once in every 45 units at the C2 position of a 1 → 6 linked D-mannofuranose residue. The D-galactose in the polysaccharides is present exclusively as non-reducing terminal furanose units; non-reducing terminal units of D-mannopyranose are also present. The variations in the identities and relative amounts of the non-reducing terminal units were the only apparent differences in the gross structural features within this group of polysaccharides.

Properties of γ-FeOOH, α-FeOOH and α-Fe2O3 particles precipitated by hydrolysis of Fe3+ ions in perchlorate containing aqueous solutions

2006 ◽  
Vol 417 (1-2) ◽  
pp. 292-299 ◽  
Author(s):  
Mira Ristić ◽  
Svetozar Musić ◽  
Matjaž Godec
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of

Isoxazoles. VII: Hydrolysis of 4-Methyl- 5-isoxazolylnaphthoquinone Derivatives in Aqueous Solutions

1991 ◽  
Vol 80 (6) ◽  
pp. 573-577 ◽  
Author(s):  
Marcela R. Longhi ◽  
Maria M. de Bertorello ◽  
Margarita C. Brinón
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of

Electrophoretic and tyndallometric studies on the hydrolysis of zinc in aqueous solutions

1971 ◽  
Vol 33 (2) ◽  
pp. 445-453 ◽  
Author(s):  
B Pokrić ◽  
Z Pučar
Keyword(s):  
Aqueous Solutions ◽  
Hydrolysis Of

Hydrolysis of Monomethyl-, Dimethyl-, and Trimethyltin(IV) Cations in Fairly Concentrated Aqueous Solutions atI= 1 mol·L−1(NaNO3) andT= 298.15 K. Evidence for the Predominance of Polynuclear Species

2011 ◽  
Vol 56 (4) ◽  
pp. 1108-1115 ◽  
Author(s):  
Rosalia M. Cigala ◽  
Concetta De Stefano ◽  
Alba Giacalone ◽  
Antonio Gianguzza ◽  
Silvio Sammartano
Keyword(s):  
Aqueous Solutions ◽  
Concentrated Aqueous Solutions ◽  
Polynuclear Species ◽  
Hydrolysis Of

Effect of Chloride Ions on the Hydrolysis of Trivalent Lanthanum, Praseodymium and Lutetium in Aqueous Solutions of 2 M Ionic Strength

2005 ◽  
Vol 34 (4) ◽  
pp. 427-441 ◽  
Author(s):  
H. López-González ◽  
M. Solache-Ríos ◽  
M. Jiménez-Reyes ◽  
J. J. Ramírez-García ◽  
A. Rojas-Hernández
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Chloride Ions ◽  
Hydrolysis Of

Metal Ion Chelates of Lipophilic Alkyl Diazinyl Ketoximes as Hydrolytic Catalysts

1999 ◽  
Vol 64 (7) ◽  
pp. 1159-1179 ◽  
Author(s):  
Radek Cibulka ◽  
František Hampl ◽  
Tomáš Martinů ◽  
Jiří Mazáč ◽  
Sonja Totevová ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Hydrolytic Activity ◽  
Hexadecyltrimethylammonium Bromide ◽  
Diphenyl Phosphate ◽  
Hydrolysis Of ◽  
Metal Ligand

A series of lipophilic dodecyl hetaryl ketoximes (hetaryl = pyridin-2-yl, pyridazin-3-yl, pyrimidin-2-yl, pyrimidin-4-yl, pyrazin-2-yl as well as their methyl hetaryl homologues was synthesized and hydrolytic activity of their chelates with Co2+, Ni2+, Cu2+ and Zn2+ in a micellar matrix of hexadecyltrimethylammonium bromide or in homogeneous aqueous solutions was investigated using 4-nitrophenyl acetate, 4-nitrophenyl hexanoate and 4-nitrophenyl diphenyl phosphate as model substrates. While Co2+ and Cu2+ chelates are almost inactive, those of Ni2+ and Zn2+ exhibit considerable activity. None of the studied chelates promotes hydrolysis of the used phosphate. The effective species are chelates of the metal : ligand stoichiometry 1 : 3 and 1 : 1 with Ni2+ and Zn2+, respectively, when the ester cleavage proceeds in the micellar matrix. The 1 : 2 stoichiometry was found in aqueous solutions of Ni2+ and Zn2+ chelates of methyl ketoximes.

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