ChemInform Abstract: CHEMISTRY OF OXALYL DERIVATIVES OF METHYL KETONES. II. RING OPENING OF 5-ARYL-2,3-FURANDIONES. SYNTHESIS OF AROYLPYRORACEMIC ACID ESTERS

1978 ◽  
Vol 9 (1) ◽  
Author(s):  
YU. S. ANDREICHIKOV ◽  
S. P. TENDRYAKOVA ◽  
YU. A. NALIMOVA ◽  
G. D. PLAKHINA
Keyword(s):  
Ring Opening ◽  
Methyl Ketones ◽  
Derivatives Of ◽  
Acid Esters

Chemistry of oxalyl derivatives of methyl ketones. XVII. Synthesis and biological activity of (arylsulfonyl)pyruvic acid esters and their derivatives

1977 ◽  
Vol 11 (10) ◽  
pp. 1379-1383
Author(s):  
Yu. S. Andreichikov ◽  
A. L. Fridman ◽  
V. L. Gein ◽  
E. L. Pidémskii ◽  
A. N. Plaksina
Keyword(s):  
Biological Activity ◽  
Pyruvic Acid ◽  
Methyl Ketones ◽  
Derivatives Of ◽  
Acid Esters

ChemInform Abstract: Anionic Derivatives of Pentafluoro-λ6-sulfanyl (Fluorosulfonyl) Acetic Acid Esters.

ChemInform ◽  
2010 ◽  
Vol 25 (7) ◽  
pp. no-no
Author(s):  
R. WINTER ◽  
G. L. GARD ◽  
R. MEWS ◽  
M. NOLTEMEYER
Keyword(s):  
Acetic Acid ◽  
Derivatives Of ◽  
Acetic Acid Esters ◽  
Acid Esters

Derivatives of isatin in aqueous solution. I. Kinetics of ring opening of Isatin-5-sulfonate

1981 ◽  
Vol 34 (2) ◽  
pp. 365 ◽  
Author(s):  
H Stunzi
Keyword(s):  
Ring Opening ◽  
Rate Of Change ◽  
Spectroscopic Methods ◽  
Ph Values ◽  
Buffer Region ◽  
Pka Value ◽  
Back Titration ◽  
Kinetics Of ◽  
Derivatives Of ◽  
Sulfonate Anion

The reactions of isatin-5-sulfonate anion (si-) which cause a hysteresis in pH titrations were studied by pH-metric and n.m.r, spectroscopic methods. Rapid alkalimetric titrations [I 0.15 M (KNO3),37�] gave the pKa value corresponding to the addition of OH- to si- [pKa(ring) 9.55]. The slow ring opening to the sulfonatoisatate dianion (sia2-) led to a drift of the pH values towards an equilibrium buffer region. Its pKa, value [pKa(eq) 3.44] corresponds to the reaction si-+H2O ↔ sia 2-+H+ Rapid back-titration gave the pKa value of the ring-opened species Hsia- [pKa(open) c. 1.3]. The rate law for the ring opening d[sia]/dt=k2 [siOH](OH)+k1*[si] was obtained from the rate of change of pH. N-Methylisatin-5-sulfonate behaves analogously.

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