Showing papers by "G. I. Nikishin published in 1992"
TL;DR: One-pot synthesis of crown thioethers, 1,10-dioxa-4,7,13,16-tetrathiacyclooctadecanes and 1-oxa- 4,7-dithiacyclononanes, which are the 2:2 and 1:1 cycloadducts of the homolytic macrocyclization of alkynes with 3-oxapentane-1,5-dimithiol, has been developed as discussed by the authors.
11 citations
TL;DR: In the presence of NaOAc, the esters of α,α,ω,ω-alkanetetracarboxylic acids undergo effective hydroxymethylation, followed by cyclization into substituted five-and six-member lactones, or tetrahydrofurans when structurally possible.
Abstract: Cyclization of esters of butane-1,1,4,4- and pentane-1,1,5,5-tetracarboxylic acids during electrolysis in methanol in the presence of Nal produces, with a yield of 95%, the esters of cyclobutane-1,1,2,2- and cyclopentane-1,1,2,2-tetracarboxylic acids. Under similar conditions, esters of the highest α,α,ω,ω-alkanetetracarboxylic acids undergo iodation and hydroxymethylation due to electrical oxidation of methanol to formaldehyde. During electrolysis in methanol in the presence of NaOAc, the esters of α,α,ω,ω-alkanetetracarboxylic acids undergo effective hydroxymethylation, followed by cyclization into substituted five- and six-member lactones, or tetrahydrofurans when structurally possible.
2 citations
TL;DR: In the two-phase system CH2Cl2 as mentioned in this paper, water gave the corresponding carbonyl compounds with good yields, including 4-chlorobutanol, cyclopropylcarbinols, andm-phenoxybenzyl alcohol.
Abstract: Oxidation of 4-chlorobutanol-1, cyclopropylcarbinols, andm-phenoxybenzyl alcohol with electrogenerated bromine, molecular bromine, and sodium hypochlorite using N-oxopiperidinium salt in the two-phase system CH2Cl2—water gave the corresponding carbonyl compounds with good yields
2 citations
TL;DR: In the presence of a mediator (sodium iodide) acetylacetone dimerizes with the formation of 3,4-diacetylhexane-2,5-dione, with a yield up to 90% as mentioned in this paper.
Abstract: In the presence of a mediator (sodium iodide) acetylacetone dimerizes with the formation of 3,4-diacetylhexane-2,5-dione, with a yield up to 90%. Salts of 2-halosubstituted 1,3-diketones form more highly enolized cyclic 1,3-diketones — 1,3-cyclohexanedione and dimedone under analogous conditions, with a yield up to 90%.
2 citations
TL;DR: The main product of the reaction of 1-methylcyclobutanol with Pb(OAc)4 in benzene is 1-phenyl-4-pentanone as discussed by the authors.
Abstract: The main product of the reaction of 1-methylcyclobutanol with Pb(OAc)4 in benzene is 1-phenyl-4-pentanone; the use of Mn(OAc)3 in acetic acid gives a mixture of 2,9-decanedione and methyl propyl ketone; 1-(chloro-, bromo-, thiocyano-, or cyano)-4-pentanone is formed in the presence of the systems Pb(OAc)4-metal halide or Mn(OAc)3-metal halide.