Transient nitronic acid formation in the acid-catalyzed decomposition of nitrobenzofuroxan and nitrobenzofurazan .sigma.-adducts in methanolic solution. A kinetic study

1985 ◽  
Vol 50 (23) ◽  
pp. 4583-4589 ◽  
Author(s):  
Francois Terrier ◽  
Guy Ah-Kow ◽  
Alain Pierre Chatrousse
Keyword(s):  
Kinetic Study ◽  
Acid Formation ◽  
Methanolic Solution ◽  
Acid Catalyzed ◽  
Nitronic Acid

Benzyl ethers of methyl α-D-glucopyranoside

1980 ◽  
Vol 45 (7) ◽  
pp. 1959-1963 ◽  
Author(s):  
Dušan Joniak ◽  
Božena Košíková ◽  
Ludmila Kosáková
Keyword(s):  
Kinetic Study ◽  
Spectrophotometric Determination ◽  
Reductive Cleavage ◽  
Ether Bond ◽  
Benzyl Ethers ◽  
Acid Catalyzed ◽  
Model Substances ◽  
Hydrolysis Of

Methyl 4-O-(3-methoxy-4-hydroxybenzyl) and methyl 4-O-(3,5-dimethoxy-4-hydroxybenzyl)-α-D-glucopyranoside and their 6-O-isomers were prepared as model substances for the ether lignin-saccharide bond by reductive cleavage of corresponding 4,6-O-benzylidene derivatives. Kinetic study of acid-catalyzed hydrolysis of the compounds prepared was carried out by spectrophotometric determination of the benzyl alcoholic groups set free, after their reaction with quinonemonochloroimide, and it showed the low stability of the p-hydroxybenzyl ether bond.

scholarly journals Theoretical kinetic study of the formic acid catalyzed Criegee intermediate isomerization: multistructural anharmonicity and atmospheric implications

2018 ◽  
Vol 20 (16) ◽  
pp. 10806-10814 ◽  
Author(s):  
M. Monge-Palacios ◽  
Matti P. Rissanen ◽  
Zhandong Wang ◽  
S. Mani Sarathy
Keyword(s):  
Carbon Atom ◽  
Formic Acid ◽  
Kinetic Study ◽  
Theoretical Study ◽  
Isomerization Reaction ◽  
Hydrogen Shift ◽  
Acid Catalyzed ◽  
Double Hydrogen

We performed a theoretical study on the double hydrogen shift isomerization reaction of a six carbon atom Criegee intermediate (C6-CI), catalyzed by formic acid (HCOOH), to produce vinylhydroperoxide (VHP), C6-CI + HCOOH → VHP + HCOOH.

4-β-D-Ribofuranosyl-1,2,4-triazin-3,5(2H,4H)-dione and 4-β-D-ribofuranosyl-6-methyl-1,2,4-triazin-3,5(2H, 4H)-dione

1982 ◽  
Vol 47 (3) ◽  
pp. 994-999 ◽  
Author(s):  
Hubert Hřebabecký
Keyword(s):  
Uv Irradiation ◽  
Sodium Methoxide ◽  
Methanolic Solution ◽  
Acid Catalyzed ◽  
Methyl Pyruvate

4-β-D-Ribofuranosyl-1,2,4-triazin-3,5(2H,4H)-dione (IX) and 4-β-D-ribofuranosyl-6-methyl-1,2,4,-triazin-3,5(2H,4H)-dione (XI) were prepared by cyclization of (Z)-4-β-D-ribofuranosyl-semicarbazones of methyl glyoxylate (VI) and methyl pyruvate (VIII) in the methanolic solution of sodium methoxide. A mixture of (E)- and (Z)-ribosylsemicarbazones III and IV was prepared by condensation of the ribosylsemicarbazide I with methyl dimethoxyacetate and a mixture of (E)-and (Z)-isomers V and VIII was obtained on condensation of I with methyl pyruvate. The (Z) isomer VI was prepared on acid-catalyzed isomerisation of the (E)-isomer III while the (Z)-isomer VIII was obtained on the UV-irradiation of isomer V.

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