Showing papers by "G. I. Nikishin published in 1980"
1 citations
TL;DR: In this paper, a mixture of α-hydroxy hydroperoxide (n = 0, 1, 2) and α,α-dihydroxy peroxide C2H5O2-CCH2C(OH)(CH3)-O-OC(OH)(CH3)CH2CO2C2C5 (n=0, 1.2) are generated selectively and enter into recombination, hydrogen transfer, and oxidation (when n=0) reactions.
Abstract: 1.
Ethyl pyruvate and levulinate react with an ether solution of hydrogen peroxide, forming α-hydroxy hydroperoxides CH3C(OH)(OOH)-(CH2)nCOOC2H5 (where n=0, 2); acetoacetic ester gives a mixture of α-hydroxy hydroperoxide (n=1) and α,α′-dihydroxy peroxide C2H5O2-CCH2C(OH)(CH3)-O-OC(OH)(CH3)CH2CO2C2H5.
2.
During the decomposition of the α-hydroxy hydroperoxides by the action of ferrous sulfate and ferrous chloride the radicals ·(CH2)nCOOC2H5 (n=0, 1, 2) are generated selectively and enter into recombination, hydrogen transfer, and oxidation (when n=0) reactions.
1 citations
TL;DR: In this article, the reaction of alkyl maleates with the methyl and ethyl esters of glutaric, adipic, azelaic, and sebacic acids, initiated by tert-butyl peroxide, gives the 1∶1 and 2∵1 adducts.
Abstract: 1.
The reaction of alkyl maleates with the methyl and ethyl esters of glutaric, adipic, azelaic, and sebacic acids, initiated by tert-butyl peroxide, gives the 1∶1 and 2∶1 adducts. From the methyl esters of the investigated acids, using a 10-fold mole excess, the 1∶1 and 2∶1 adducts are formed in a ratio ranging from 0.9∶1 to 1.4∶1, while the ethyl esters they are formed in a ratio ranging from 1.9∶1 to 2.3∶1. The use of a 20-fold excess of the ester increases this ratio to ∿4∶1.
2.
Two types of adducts are obtained from the esters of glutaric and adipic acids: the addition products of the alkyl maleate to the α-C atoms of the acyl and alkoxyl portions of the ester addend. The addition of the methyl esters of azelaic and sebacic acids to the alkyl maleate takes place predominantly (over 90%) at the carbon atom adjacent to the methoxycarbonyl group.
TL;DR: The reaction, initiated by tert-butyl peroxide, of the C1-C5 alkyl esters of alkanoic acids, excluding the ethyl alkanoates, with alkyls maleates gives only the addition products at the acyl group of the ester, in which connection the propionates and isobutyrates react regioselectively at the α-C atom, while the other esters react predominantly at the (ω-1)-C atoms as discussed by the authors.
Abstract: 1.
The reaction, initiated by tert-butyl peroxide, of the C1-C5 alkyl esters of alkanoic acids, excluding the ethyl alkanoates, with alkyl maleates gives only the addition products at the acyl group of the ester, in which connection the propionates and isobutyrates react regioselectively at the α-C atom, while the other esters react predominantly at the α- and (ω-1)-C atoms.
2.
Hexyl acetate, octyl formate, and ethyl benzoate under analogous conditions add to alkyl maleates at the alkoxyl group (ethyl benzoate reacts regioselectively at the α-C atom, while hexyl acetate and octyl formate react predominantly at the (ω-1)-C atom.
3.
γ-Butyrolactone and the alkyl maleate form the addition products at both theα- and γ-c atoms of butyrolactone in an ∿4∶1 ratio.
TL;DR: In this article, the spontaneous formation of stabilized 1,2-dicarboxyethyl radicals in a crystalline matrix during the complete removal of the solvent from a solution of PDSA and SA in water, methanol, or acetone was discovered.
Abstract: A new phenomenon, viz. the spontaneous formation of stabilized 1,2-dicarboxyethyl radicals in a crystalline matrix during the complete removal of the solvent from a solution of PDSA and SA in water, methanol, or acetone, was discovered.