Tosyl-a-amino Acids. III. The Acid-catalysed Degradation of Tosyl-α-amino Acids and Derivatives

1963 ◽  
Vol 16 (5) ◽  
pp. 889 ◽  
Author(s):  
AF Beecham
Keyword(s):  
Amino Acids ◽  
Carbon Monoxide ◽  
Carbon Atom ◽  
Sulphuric Acid ◽  
Carbonyl Compound ◽  
Amino Acids And Derivatives ◽  
Relationship Of ◽  
The Relationship

Tosyl-α-amino acids, their chlorides and esters, evolve carbon monoxide when dissolved in concentrated sulphuric acid. Toluene-p-sulphonamide and a carbonyl compound are produced when water is added to the resulting solutions. The ease of degradation depends upon the nature of the substituents at the α-carbon atom. The relationship of these to similar degradations of substituted α-amino acids is discussed.

scholarly journals Mn(III)acetate-Induced Electron Transfer in Pentaammine Cobalt(III)Complexes of α-Amino Acids in Micellar Medium

2012 ◽  
Vol 9 (2) ◽  
pp. 912-917
Author(s):  
S. Udhayavani ◽  
K. Subramani
Keyword(s):  
Amino Acids ◽  
Electron Transfer ◽  
Sulphuric Acid ◽  
Carbonyl Compound ◽  
Carbonyl Compounds ◽  
Acidic Medium ◽  
Micellar Medium ◽  
Uv Visible ◽  
Experimental Findings ◽  
Catalyzed Oxidation

A micellar catalyzed oxidation of pentaamminecobalt(III) complexes of α-amino acids by Mn(III)acetate in acidic medium yielding nearly 100% Co(II) and about 100% carbonyl compounds are ultimate products. The unbound amino acids yield about 100% of carbonyl compound in presence of micelles. The effect of variation of sulphuric acid has been carried. The decrease in UV-Visible absorbance at λ=502 nm for Co(III) complex corresponds to nearly 100% of the initial absorbance. In spite of the stoichiometry of Mn(III) to unbound ligand is 2:1, the ratio of Mn(III) to cobalt(III) complex is 1:1 accounting for about 100% reduction at the cobalt(III) centre. The kinetic and stoichiometric results have been accounted. A suitable mechanism consistent with the experimental findings has been proposed by involving a radical cation intermediate.

The Relationship of Physicochemical Properties to the Antioxidative Activity of Free Amino Acids in Fenton System

2015 ◽  
Vol 49 (7) ◽  
pp. 4245-4254 ◽  
Author(s):  
Sonja Milić ◽  
Jelena Bogdanović Pristov ◽  
Dragosav Mutavdžić ◽  
Aleksandar Savić ◽  
Mihajlo Spasić ◽  
...  
Keyword(s):  
Amino Acids ◽  
Physicochemical Properties ◽  
Free Amino Acids ◽  
Free Amino ◽  
Antioxidative Activity ◽  
Relationship Of ◽  
The Relationship ◽  
Fenton System

scholarly journals Amino acid deprivation and its effect on mating ability inEscherichia coliK12

1966 ◽  
Vol 8 (1) ◽  
pp. 115-118 ◽  
Author(s):  
K. W. Fisher
Keyword(s):  
Escherichia Coli ◽  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Deprivation ◽  
Mating Ability ◽  
Chromosome Transfer ◽  
E Coli ◽  
Donor Cells ◽  
Relationship Of ◽  
The Relationship

The conclusion by Suit, Matney, Doudney & Billen (1964) that Hfr donor cells ofEscherichia coliK12, starved of required amino acids can mate, has been re-examined. It appears that their conclusion is not valid and that apparent fertility of amino-acid starved cells is due to cross-feeding by the F−cells. The relationship of this result to the alternative mechanisms for chromosome transfer inE. coliis discussed.

A Study of the Relationship of Street Level Carbon Monoxide Concentrations to Traffic Accidents

AIHAJ ◽  
1960 ◽  
Vol 21 (1) ◽  
pp. 46-54 ◽  
Author(s):  
George D. Clayton ◽  
Warren A. Cook ◽  
W. G. Fredrick
Keyword(s):  
Carbon Monoxide ◽  
Traffic Accidents ◽  
Street Level ◽  
Relationship Of ◽  
The Relationship
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