The Equilibrium between an Areneselenic Acid and Its Anhydride
The equilibrium constants (Keq = 2/) associated with the equilibrium (eq 1) between o-nitro- and o-benzoylbenzeneselenenic anhydrides (2a and 2b) and the corresponding selenenic acids (1a and 1b) have been determined in dioxane containing 0.25-1.5percent water.For the 2b-1b equilibrium, Keq = 0.16 (25 deg C) and ΔH0 = +0.6 kcal/mol.The equilibrium constant for the 2a-1a system is ca. 10 times larger.That ΔH0 for the hydrolysis of 2b is slightly endothermic contrasts sharply with the exothermic nature of the hydrolysis of most common acid anhydrides.The values of Keq for both 2b and 2a are such that conditions can easily be encountered in media of low water content, where a significant fraction of the selenenic anhydride will remain unhydrolyzed at equilibrium, a situation without precedent in the chemistry of typical acid anhydrides.
Kang, Sang-Ihn,Kice, John L.
p. 2968 - 2972
(2007/10/02)
Mechanism of the Hydrolysis of o-Nitro- and o-Benzoylbenzeneselenenic Anhydrides
The hydrolyses (eq 1) of o-nitro- (2a) and o-benzoylbenzeneselenenic (2b) anhydrides to the corresponding acids (1a and 1b) havebeen studied kinetically over a range of pH in a series of buffers in 60percent dioxane.Both hydrolyses require acid catalysis.
Kice, John L.,McAfee, Farrell,Slebocka-Tilk, Henryka
p. 3100 - 3106
(2007/10/02)
Mechanism of the Reaction of Thiols with o-Nitro- and o-Benzoylbenzeneselenenic Acids and Anhydrides
The kinetics of the reaction of an alkanethiol (n-BuSH) with o-nitro- (1a) and o-benzoylbenzeneselenenic (1b) acids (eq 3) and with the corresponding selenenic anhydrides (eq 4, 2a and 2b) have been investigated over a range of pH in a series of buffers i
Kice, John L.,McAfee, Farrell,Slebocka-Tilk, Henryka
p. 3106 - 3114
(2007/10/02)
THE ANHYDRIDE STRUCTURE OF SEVERAL PREVIOUSLY REPORTED STABLE ARSENESELENENIC ACIDS
The compounds previously reported to be the stable areneselenenic acids, o-nitro- (1a) and o-benzoylbenzeneselenenic acid (1b), are shown actually to be the corresponding selenenic anhydrides (ArSeOSeAr).Solutions of the selenenic acids (ArSeOH), however,
Kice, John L.,McAfee, Farrell,Slebocka-Tilk, Henryka
p. 3323 - 3326
(2007/10/02)
More Articles about upstream products of 84250-81-7