Studies on Lignin and Related Compounds. XXV. Mechanism of Vanillin Formation from Spruce Lignin Sulfonic Acids in Relation to Lignin Structure1

1936 ◽  
Vol 58 (2) ◽  
pp. 348-353 ◽  
Author(s):  
George H. Tomlinson ◽  
Harold Hibbert
Keyword(s):  
Sulfonic Acids ◽  
Related Compounds

Reactivity of triformylmethane. I. Reactions of triformylmethane with selected types of amino compounds

1991 ◽  
Vol 56 (5) ◽  
pp. 1019-1031 ◽  
Author(s):  
Zdeněk Arnold ◽  
Miloš Buděšínský ◽  
Magdalena Pánková
Keyword(s):  
Lewis Acids ◽  
Secondary Amines ◽  
Primary Amines ◽  
Carbamic Acid ◽  
Sulfonic Acids ◽  
Primary Products ◽  
Amino Compounds ◽  
Related Compounds

Reactions of triformylmethane with various types of amino compounds were investigated. Besides with ammonia, triformylmethane reacts spontaneously with primary amines, aminoacids and their esters, urea and related compounds including carbamic acid derivatives. Reactions with amides of carboxylic and sulfonic acids require catalysis with Lewis acids. Primary products are aminomethylenemalonaldehyde derivatives IIIa-IIIv. Reactions of triformylmethane with excess of selected primary amines and two secondary amines (dimethylamine and morpholine) were also studied.

Amino sulfonic acids, peptidosulfonamides and other related compounds

Tetrahedron ◽  
2018 ◽  
Vol 74 (13) ◽  
pp. 1355-1421 ◽  
Author(s):  
Oleksandr O. Grygorenko ◽  
Angelina V. Biitseva ◽  
Serhii Zhersh
Keyword(s):  
Sulfonic Acids ◽  
Related Compounds

Ionization of sulfonic acids and dimethylsulfoxide basicity. A 13C nuclear magnetic resonance and calorimetric study

1989 ◽  
Vol 67 (12) ◽  
pp. 2148-2152 ◽  
Author(s):  
Robert L. Benoit ◽  
Monique Fréchette ◽  
Danielle Boulet
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Bulk Water ◽  
Calorimetric Study ◽  
Enthalpies Of Solution ◽  
Sulfonic Acids ◽  
13C Nuclear Magnetic Resonance ◽  
Related Compounds ◽  
C Nmr ◽  
Nuclear Magnetic

The ionization of trifluoromethane-, methane-, and benzene-sulfonic acids in Me2SO and in water has been studied by 13C nuclear magnetic resonance. While the protonation shifts of CF3SO3− and CH3SO3− in both solvents are too small to make a quantitative interpretation possible, the C6H5SO3− shift data in H2O–H2SO4 mixtures, when treated by the method of Cox and Yates, gave a pKa value of −2.5 for the ionization of C6H5SO3H. Our results are discussed in relation to those of other workers. Enthalpies of solution and of ionization of these acids and related compounds have been obtained in both solvents. Single ion enthalpies of transfer from water to Me2SO have been calculated from our data and from a transfer value for CF3SO3− (+1.9 kJ mol−1) based on the tetraphenylarsonium–tetraphenylborate extrathermodynamic assumption. The transfers are endothermic processes for the anions CH3SO3− (+29.6 kJ mol−1), C6H5SO3− (+ 20.2 kJ mol−1), and p-CH3C6H4SO3− (+ 21.8 kJ mol−1), and exothermic for H+(−27.4 kJ mol−1). These results are discussed in terms of the properties of the ions and solvents. The transfer value for H+ is a valuable measure of the basicity difference between bulk water and Me2SO. Keywords: sulfonic acids, ionization, dimethylsulfoxide, 13C NMR, calorimetry.

scholarly journals THE COMBINATION OF DIVALENT MANGANESE WITH CERTAIN PROTEINS, AMINO ACIDS, AND RELATED COMPOUNDS

1935 ◽  
Vol 19 (1) ◽  
pp. 127-147 ◽  
Author(s):  
Raymond K. Main ◽  
Carl L. A. Schmidt
Keyword(s):  
Amino Acids ◽  
Complex Formation ◽  
Phosphoric Acid ◽  
Dicarboxylic Acids ◽  
Manganese Complexes ◽  
Test Substance ◽  
Sulfonic Acids ◽  
Monocarboxylic Acids ◽  
Inorganic Acids ◽  
Related Compounds

1. A study of the mode of combination which takes place between certain amino acids, proteins, various carboxylic acids, and certain sulfonic acids and manganous ions to form complexes is reported. 2. Three criteria for complex formation were used: (a) the equilibrium between the substance under test and manganous ions dissolved in aqueous buffered solution and isonitrosoacetophenone dissolved in chloroform; (b) the electrophoretic migration of manganese in the presence of the test substance with varying pH; and (c) anomalous titration. 3. The following classes of substances were found to possess the necessary groupings to form manganese complexes: hydroxy-monocarboxylic acids (lactic, gluconic), dicarboxylic acids (oxalic, malonic), hydroxy-, di- and tricarboxylic acids (citric, tartaric), dicarboxylic amino acids (aspartic, glutamic), certain inorganic acids (phosphoric, sulfuric), certain phosphoric acid-containing compounds (nucleic, glycerophosphoric), certain aromatic enol sulfonic acids (phenolsulfonic, catecholsulfonic), and certain proteins (casein, edestin, gelatin). 4. A correlation between the amount of manganese bound by the several proteins and the free carboxyl and phosphoric acid groups has been made. 5. An explanation based on the residual charge of certain atoms is advanced for the manner in which divalent manganese may be united by the compounds studied.

Zebrafish models for hallucinogenic-related compounds

2013 ◽  
Author(s):  
A. V. Kalueff ◽  
A. M. Stewart ◽  
V. Gjeloshi ◽  
D. Kondaveeti ◽  
N. Neelkantan ◽  
...  
Keyword(s):  
Related Compounds
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