The volume changes, ΔV, in the proton ionization of some pyridinium ions have been determined at 25°C from the partial molar volumes, V° of neutral bases and their hydrochloride salts. The ΔV° values have been compared with those of other classes of amines and discussed in terms of ...
Chemischer InformationsdienstSanchez-Ruiz, J. M., Llor, J., and Cortijo, M. (1984) Thermody- namic constants for tautomerism and ionization of pyridoxine and 3-hydroxy-pyridine in water- dioxane. J. Chem. Soc. Perkin Trans. II 2047-2051....
Perturbations produced by electrospray ionization mass spectrometry in the speciation of aluminium(III)/1,6-dimethyl-4-hydroxy-3-pyridinecarboxylate aqueou... Electrospray ionization mass spectrometry (ESI-MS) is very often employed to study metal/ligandequilibria in aqueous solution. However, the ioniza...
An interesting feature of the present system is that it can be operated under full-scan conditions for an “alarm” when pesticides are present in ground water samples. These levels are generally set at 2 μg/l, and from the LC- APCI-MS traces in Fig. 5.22A, it is clear that this ...
1H-1H COSY NMR measurement of fully acetylated amylosamine: A mixture of theN-acetylated amylosamine (8.5mg),acetic anhydride(0.50mL, 5.00mmol), andN,N-dimethylaminopyridine (0.50mg, 4.09μmol) in pyridine (1.0mL) was stirred at 80°C for 6h. After concentration of the reaction...
Nonlogarithmic titration method for the determination ofdissociation constantof loratadine; 非对数滴定法测定氯雷他定的解离常数 3. The isoelectric point(I) anddissociation constants,K_(a1) and K_(a2) of 4-hydroxy-3-nitro-pyridine were determined by acid-base titration with a pH meter. ...
The distribution of pyridine, quinoline, and certain methyl-substituted derivatives has been studied in immiscible systems composed of cyclohexane or chloroform and water or citrate-phosphate buffer. Partition coefficients and approximat... M Orchin,C Golumbic - 《Journal of the American Chemical Soci...
Triplet acetylenes as synthetic equivalents of 1,2-bicarbenes: phantom n,pi state controls reactivity in triplet photocycloaddition. Diaryl acetylenes, in which one of the aryl groups is either a pyridine or a pyrazine, undergo efficient triplet state photocycloaddition to 1,4-cyclohexad... Tare...
chloroform and distilled water used for the preparation of extraction solvent and ribitol used as internal standard were purchased from Wako Pure Chemical In- dustries, Ltd. (Osaka, Japan). Pyridine (Wako), methoxyamine hydrochloride (Sigma Aldrich, Milwaukee, WI, USA) and N-Methyl-N-(trimethyls...
b. Ionization of a strong acid in water solution. c. Ionization of a weak acid in water solution. Write the balanced equation for the ionization of the weak base pyridine, C_5H_5N, in water. Classify the compound given as a strong acid,...