Showing papers on "Free-radical reaction published in 1985"
376 citations
53 citations
44 citations
TL;DR: In this article, an approach to the lignan system is presented, where alpha halo stannyl esters react with alkenes to afford lactones, catalyzed by AIBN.
32 citations
31 citations
TL;DR: In this article, free radical cyclizations of several bromo allyl and diallyl substituted sulfonamides are described, and the regiochemical course of these cyclizations depend on the nature of the substituent groups attached to the π-bond.
30 citations
29 citations
TL;DR: A total synthesis of the unique epoxy-lactone alliacolide, featuring a novel, stereoselective intramolecular radical cyclisation onto an enolic double-bond, viz (13) → (14), as a key step, is described in this paper.
26 citations
25 citations
TL;DR: The diphenyl ether herbicides MC 15608 and MC 10878 as discussed by the authors are structurally similar to acifluen-methyl (methyl ester of 5-[2-chloro-4-(trifluoromethyl)phenoxy]-nitrobenzoic acid), except that the NO 2 is replaced by a Cl and H, respectively.
20 citations
TL;DR: In this paper, two examples of radical reactions involving cobalt complexes are described: the reactions of allylcobaloximes with 2-bromo 2-phenylacetonitriles leading to the corresponding monoallyl derivatives.
TL;DR: La reaction a lieu avec et sans inhibiteur de chaine (C 2 H 5 OH) as mentioned in this paper is a reaction in the context of rendements in N 2, N 2 O.
Abstract: La reaction a lieu avec et sans inhibiteur de chaine (C 2 H 5 OH). Mesure des rendements en N 2 , N 2 O. Mecanismes
TL;DR: Free radical additions of hydrogen donor solvents to tert-butyl perpent-4-enoate have given 4-substituted γ-butyrolactones, with yields of 50 % or greater.
TL;DR: In this paper, the disproportionation of chlorite was studied in 0.01 to 1 1/4 M perchloric acid solutions at 25 °C and an ionic strength of 1 1 /4 M. The results suggest at least three reaction paths.
Abstract: The disproportionation of chlorite was studied in 0.01 to 1 M perchloric acid solutions at 25 °C and an ionic strength of 1 M. The results suggest at least three reaction paths. The first is cataly...
TL;DR: In this paper, the cyclic thiocarbonates 1 to 3 react with tri(n-butyl)tin hydride under formation of the deoxygenation products 10, 11, 12, and 14.
TL;DR: Tetrahydrofurans with alkenyl substituents were obtained by the radical cyclization of β-bromoethers using allyltri-n-butylstannane in a one-pot reaction.
Abstract: Tetrahydrofurans with alkenyl substituents were obtained by the radical cyclization of β-bromoethers using allyltri-n-butylstannane in a one-pot reaction.
TL;DR: The radical intermediates generated by denitration of tertiary nitro compounds with tributyltin hydride undergo the carbon-carbon bond forming reaction with double bonds, which provides a useful method for the construction of quaternary carbon centers as discussed by the authors.
Abstract: The radical intermediates generated by denitration of tertiary nitro compounds with tributyltin hydride undergo the carbon–carbon bond forming reaction with double bonds, which provides a useful method for the construction of quaternary carbon centers.
TL;DR: In this paper, a meme reaction a partir d'hydroxy-2' ethyl-2 oxo-4 cyclobutanebutyrate conduit au dioxa-1,6bicyclo is described.
Abstract: Synthese photochimique de perhydro furo [2,3-b] furannebutyrates- et -propionates-2 de methyle a partir des hydroxy-2' ethyl-3 oxo-2 cyclobutanebutyrate- et -propionate de methyle via des perhydro carbena-2furannes. La meme reaction a partir d'hydroxy-2' ethyl-2 oxo-4 cyclobutanebutyrate conduit au dioxa-1,6bicyclo [3.2.1] octanebutyrate-5
TL;DR: In this paper, the kinetics of the homolytic substitution of several trialkyltin iodides by iodine atoms are presented. Rate constants have been determined at three different temperatures and the following activation parameters calculated: A, Ea, and ΔS°≠.
Abstract: The kinetics of the homolytic substitution of several trialkyltin iodides by iodine atoms are presented. Rate constants have been determined at three different temperatures and the following activation parameters calculated: A, Ea, and ΔS°≠. The observation that the activation energy, ΔG≠, is related to the driving force of the ion-pair formation, leads to the conclusion that the charge-transfer model is a valid approach for substitution in the reaction between R3SnI compounds and iodine atoms.
TL;DR: The radicals formed on γ radiolysis of N-acetyl-L-valine in the polycrystalline state at 77 K, at ambient temperature (303 K), and on subsequent warming over the range 77-440 K are reported.
01 Jan 1985
TL;DR: In this article, it is pointed out that only the ESR technique (Sevilla 1981) gives an unequivocal detection of free radicals because it is based on the measurements of unpaired electrons.
Abstract: Free radicals in plant and animal products are far from being thoroughly investigated. Their direct measurements are often lacking and their existence has been usually inferred from either observed products or oxygen depletion studies (Simic and Karel 1980). In both approaches, the deductions are based on comparison with model systems, where free radicals can be observed directly (see, e.g., Hoffman 1981) by electron spin resonance (ESR), spectrophotometry, or some other physicochemical techniques, under strictly controlled conditions. It should be pointed out, however, that only the ESR technique (Sevilla 1981) gives an unequivocal detection of free radicals because it is based on the measurements of unpaired electrons.
TL;DR: In this article, it was shown that there will be strong orienting effects in the collision of two radicals which will invalidate attempts to calculate disproportionation-recombination ratios by simple geometric argu...
Abstract: It is shown that there will be strong orienting effects in the collision of two radicals which will invalidate attempts to calculate disproportionation–recombination ratios by simple geometric argu...
TL;DR: The free radical reaction of lead tetraacetate with hydrocarbons has been investigated in this article, where the products of these reactions are the acetate esters, and the hydrogen abstracting species from lead tetrasacetate is found to have a primary to secondary to tertiary selectivity of 1:27:123 based upon relative reactivities.
TL;DR: In this article, a kinetic ESR study of photo-oxidation reactions initiated by t-butoxyl radicals has been performed on 2,2,6,6-tetramethylpiperidine derivatives (HALS).