Degradation of Paclitaxel and Related Compounds in Aqueous Solutions II: Nonepimerization Degradation Under Neutral to Basic pH Conditions

2008 ◽  
Vol 97 (8) ◽  
pp. 3100-3108 ◽  
Author(s):  
Jiaher Tian ◽  
Valentino J. Stella
Keyword(s):  
Aqueous Solutions ◽  
Ph Conditions ◽  
Related Compounds

scholarly journals Copper(II) Complexes of Histidine and Its Related Compounds in Aqueous Solutions

1974 ◽  
Vol 47 (4) ◽  
pp. 1003-1007 ◽  
Author(s):  
Hiroji Aiba ◽  
Akira Yokoyama ◽  
Hisashi Tanaka
Keyword(s):  
Aqueous Solutions ◽  
Related Compounds

Selective Sorption of Phenol and Related Compounds from Aqueous Solutions onto Graphitized Carbon Black. Adsorption and Flow Microcalorimetric Studies

Langmuir ◽  
1996 ◽  
Vol 12 (2) ◽  
pp. 423-430 ◽  
Author(s):  
Zoltán Király ◽  
Imre Dékány ◽  
Erwin Klumpp ◽  
Hans Lewandowski ◽  
Hans D. Narres ◽  
...  
Keyword(s):  
Carbon Black ◽  
Aqueous Solutions ◽  
Graphitized Carbon Black ◽  
Selective Sorption ◽  
Graphitized Carbon ◽  
Related Compounds

Formation and properties of Fe(II)Fe(III) hydroxy-carbonate and its possible significance in soil formation

Clay Minerals ◽  
1980 ◽  
Vol 15 (4) ◽  
pp. 369-382 ◽  
Author(s):  
R. M. Taylor
Keyword(s):  
Soil Formation ◽  
Oxidation Products ◽  
Ph Values ◽  
Carbonate Solutions ◽  
Freeze Dried ◽  
Colour Changes ◽  
Ph Conditions ◽  
Related Compounds ◽  
Magnetite Phase ◽  
Hydroxy Carbonate

AbstractSmall amounts of Fe(III) induce precipitation of Fe(II) from carbonate solutions around neutral pH values. The reaction involves the formation of Fe(II)Fe(III) hydroxycarbonate, a green, layer-structured compound of the pyroaurite group of minerals. Variations in the concentration of Fe(II) in the solution phase, and in the form and amounts of the total Fe(III) in the system, may cause other phases such as magnetite and siderite to form also. Freeze-dried Fe(II)Fe(III) hydroxy-carbonate undergoes topotactic alteration to a magnetic phase, presumably maghemite, when stored under vacuum. The compound is readily oxidized in air in either the moist or dry state, rapidly becoming yellow or yellow-brown in colour. Oxidation leads to the formation of either goethite, lepidocrocite, ferrihydrite or mixtures of these phases, depending on the mode of oxidation and the impurities present. The similarity between the rapid colour changes and the oxidation products of the blue-green precipitates in gleyed soil horizons and this Fe(II)Fe(III) hydroxy-carbonate leads to the speculation that this and related compounds may be the meta-stable precipitates in such soils, rather than a previously postulated hydro-magnetite phase. Eh and pH conditions for the formation of Fe(II)Fe(III) hydroxy-carbonate are given, and are in the range encountered in the soil environment.

Ionization of Buthidazole, VEL 3510, Tebuthiuron, Fluridone, Metribuzin, and Prometryn

Weed Science ◽  
1980 ◽  
Vol 28 (5) ◽  
pp. 467-474 ◽  
Author(s):  
J. B. Weber
Keyword(s):  
Aqueous Solutions ◽  
Related Compounds

Aqueous solutions of buthidazole {3-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl]-4-hydroxy-1-methyl-2-imidazolidinone}, VEL 3510 {1-β,β-dimethoxyethyl-1-methyl-3-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl] urea}, tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadazol-2-yl]-N,N′-dimethylurea}, fluridone 1-methyl-3-phenyl-5-[3-trifluoromethyl)phenyl]-4(1H)-pyridinone, metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one], and prometryn [2,4-bis(isopropylamino)-6-(methylthio)-s-triazine] were spectrophotometrically titrated to obtain pKAvalues. Ionizing properties of the chemicals were compared with other related compounds reported in the literature. The pKAvalues for the six herbicides were 0.6 and 11.3, 0.9 and 9.0, 1.2, 1.7, 1.1, and 4.1, respectively.

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