ChemInform Abstract: Alkaline Cleavage of Trihaloacetophenones

ChemInform ◽  
2010 ◽  
Vol 22 (8) ◽  
pp. no-no
Author(s):  
J. P. GUTHRIE ◽  
J. COSSAR
Keyword(s):  
Alkaline Cleavage

THE ALKALINE CLEAVAGE OF o-NITROBENZYLTRIMETHYLSILANE SOLVENT EFFECTS IN THE DIOXANE–WATER SYSTEM

1963 ◽  
Vol 41 (6) ◽  
pp. 1525-1530 ◽  
Author(s):  
H. R. Allcock
Keyword(s):  
Transition State ◽  
Solvent Effects ◽  
Water System ◽  
Solvent Polarity ◽  
High Water ◽  
Aqueous Dioxane ◽  
Alkaline Cleavage ◽  
Rate Of Reaction ◽  
Kinetics Of

The kinetics of alkaline cleavage of o-nitrobenzyltrimethylsilane were examined in aqueous dioxane media. At high water concentrations, increases in solvent polarity retard the cleavage, as required by a mechanism involving charge dispersion in the transition state. At high dioxane concentrations, solvent polarity increases are accompanied by increases in the rate of reaction, a result which may reflect association between the solvent components.

scholarly journals Specific lysine labeling by 18OH- during alkaline cleavage of the alpha-1-antitrypsin-trypsin complex.

1977 ◽  
Vol 74 (10) ◽  
pp. 4311-4314 ◽  
Author(s):  
A. B. Cohen ◽  
L. D. Gruenke ◽  
J. C. Craig ◽  
D. Geczy
Keyword(s):  
Alkaline Cleavage ◽  
Alpha 1 Antitrypsin

Alkaline Cleavage of Unsymmetrical β-Diketones. Ring Opening of Acylcylohexanones to Form ε-Acyl Caproic Acids1

1948 ◽  
Vol 70 (12) ◽  
pp. 4023-4026 ◽  
Author(s):  
Charles R. Hauser ◽  
Frederic W. Swamer ◽  
Betty I. Ringler
Keyword(s):  
Ring Opening ◽  
Alkaline Cleavage

scholarly journals Novel Betaines of the Hexaalkylguanidinio-carboxylate Type

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1617-1624 ◽  
Author(s):  
Matthias Walter ◽  
Gerhard Maas
Keyword(s):  
Nucleophilic Substitution ◽  
Methyl Esters ◽  
Melting Points ◽  
Alkaline Cleavage

Betaines 7a, b and 8a, b have been prepared from 3- and 4-piperidinecarboxylic acid and N,N,N',N'-tetraalkyl-chloroformamidinium chlorides via the corresponding methyl esters. These betaines are highly hygroscopic, thermally very stable, and, with the exception of 7b, have rather low melting points. They undergo a surprisingly facile alkaline cleavage of the hexaalkylguanidinium moiety. They react with dichloromethane by a twofold nucleophilic substitution to form methylene dicarboxylates such as 11. TheNMR (1H, 13C) data of betaines 7 and 8 are discussed

Alkaline Cleavage of 2,3-Dibromo-2-butene-1,4-diammonium Salts

2005 ◽  
Vol 75 (11) ◽  
pp. 1717-1719
Author(s):  
T. A. Saakyan ◽  
A. Kh. Gyul'nazaryan ◽  
N. O. Markaryan ◽  
S. T. Kocharyan
Keyword(s):  
Alkaline Cleavage

Flavonoide von Larrea tridentata / Flavonoids of Larrea tridentata

1973 ◽  
Vol 28 (1-2) ◽  
pp. 32-35 ◽  
Author(s):  
Jean Jacques Chirikdjian
Keyword(s):  
Methyl Ether ◽  
Larrea Tridentata ◽  
Spectrophotometric Methods ◽  
Alkaline Cleavage

The presence of 20 flavonoids has been detected in herbs of Larrea tridentata. Six pigments were isolated and characterized by chromatographic and spectrophotometric methods (shifts with several reagents), acid hydrolytic and alkaline cleavage and finally by comparison with authentic samples. The structure of this compounds has been established as: quercetin-3-rhamnoglucoside, quercetin-3-glucoside, kaempferol-3-methyl ether, quercetin-31-methyl ether, kaempferol and quercetin.

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