共查询到20条相似文献,搜索用时 31 毫秒
1.
G. V. Gavrilova D. P. Krut'ko A. A. Gavrilov K. P. Butin 《Russian Chemical Bulletin》1997,46(9):1565-1568
The reaction of 2,6-di-tert-butyl-4-dichloromethyl-4-methylcyclohexa-2,5-dien-1-one with (Me3Si)2NNa yielded 2,4-di-tert-butyl-1-chloro-6-methyltricyclo[4.1.0.02,7]hept-4-en-3-one (substituted tropovalene). The structure of the title compound was established by1H and13C NMR spectroscopy and X-ray diffraction analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1642–1645, September, 1997. 相似文献
2.
V. N. Glushakova N. A. Skorodumova V. I. Nevodchikov L. G. Abakumova N. P. Makarenko V. K. Cherkasov N. O. Druzhkov 《Russian Chemical Bulletin》1999,48(5):934-937
Reaction of 3,6-di-tert-butyl-1,2-benzoquinone and 3,6-di-tert-butylcatechol withtert-butyl hydroperoxide in aprotic solvents leads to the generation of semiquinone (SQ.H), alkylperoxy (ROO.), and alkyloxy radicals. The reaction of SQ.H and ROO. produces 2,5-di-tert-butyl-6-hydroxy-1,4-benzoquinone, 3,6-di-tert-butyl-1-oxacyclohepta-3,5-diene-2,7-dione, and 2,5-di-tert-butyl-3,6-dihydroxy-1,4-benzoquinone. The radical generated from solvent attacks SQ.H at position 4 with C−C bond formation. 4-Benzyl-2,5-di-tert-butyl-6-hydroxycyclohexa-2,5-diene-1-dione produced in this way is transformed into 4-benzyl-3,6-di-tert-butyl-1,2-benzoquinone under the reaction conditions.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 943–946, May, 1999. 相似文献
3.
L. Yu. Ukhin K. Yu. Suponitskii L. V. Belousova T. N. Gribanova 《Russian Chemical Bulletin》2009,58(5):940-943
5-(3,5-Di-tert-butyl-4-hydroxyphenyl)-1,2,3,5-tetrahydrophenazine was synthesized by the reaction of 2,6-di-tert-butyl-1,4-benzoquinone-4-(o-aminophenyl)imine with cyclohexanone. The structure of the reaction product was established by X-ray diffraction. 相似文献
4.
Bukharov S. V. Syakaev V. V. Pod'yachev S. N. Nugumanova G. N. Mukmeneva N. A. 《Russian Journal of General Chemistry》2002,72(6):924-927
Solvolysis of 3,5-di-tert-butyl-4-hydroxybenzyl acetate in alcohol solutions involves intermediate formation of 2,6-di-tert-butyl-4-methylene-1-benzoquinone that further takes up a molecule of the alcohol. 相似文献
5.
A. P. Avdeenko V. V. Pirozhenko O. V. Shishkin G. V. Palamarchuk R. I. Zubatyuk S. A. Konovalova O. N. Ludchenko 《Russian Journal of Organic Chemistry》2008,44(6):807-813
Chlorination of N-aroyl(arylsulfonyl)-2,6-di-tert-butyl-1,4-benzoquinone imines gave Z and E isomers of 4-arylsulfonylimino-2,6-di-tert-butyl-5,6-dichlorocyclohex-2-en-1-ones and Z isomers of 4-aroyl-(arylsulfonyl)imino-2,6-di-tert-butyl-5,5,6-trichlorocyclohex-2-en-1-ones, in which the tert-butyl group on the sp
3-hybridized carbon atom occupies exclusively the axial position. The formation of Z/E-isomeric structures is related to configurational stability of the chlorination products. The chlorination of 4-aroylamino-2,6-di-tertbutylphenols was found to be accompanied by replacement of one tert-butyl group by chlorine atom with formation of 4-aroylimino-6-tert-butyl-2,3,5,6-tetrachlorocyclohex-2-en-1-ones.
Original Russian Text ? A.P. Avdeenko, V.V. Pirozhenko, O.V. Shishkin, G.V. Palamarchuk, R.I. Zubatyuk, S.A. Konovalova, O.N.
Ludchenko, 2008, published in Zhurnal Organicheskoi Khimii, 2008, Vol. 44, No. 6, pp. 818–824.
For communication VII, see [1]. 相似文献
6.
P. S. Vlasov O. Yu. Sergeeva N. S. Domnina I. Yu. Chukicheva E. V. Buravlev A. V. Kuchin 《Chemistry of Natural Compounds》2012,48(4):531-534
New macromolecular antioxidants that were conjugates of dextran or hydroxyethylated starch with functionalized derivatives synthesized from 2,6-diisobornyl-4-methylphenol were prepared. Their antiradical activity compared with derivatives of 2,6-di-tert-butyl-4-methylphenol was studied in a model reaction with 2,2-diphenyl-1-picrylhydrazyl. The studied conjugates exhibited greater activity than sterically hindered phenols not bonded to a polymer chain. The synthesized isobornyl derivatives were more active than previously studied tert-butyl analogs. 相似文献
7.
A. P. Krysin A. M. Genaev L. M. Pokrovskii M. M. Shakirov 《Russian Journal of Organic Chemistry》2014,50(3):367-370
2,6-Di-tert-butyl-4-(2-hydroxyethyl)phenol undergoes oxidative self-coupling by the action of K3Fe(CN)6 in alkaline medium at room temperature to give 7,9-di-tert-butyl-4-(3,5-di-tert-butyl-4-hydroxyphenyl)-1-hydroxymethyl-2-oxaspiro[4.5]deca-6,9-dien-8-one. The composition of the reaction products has been determined, and the mechanism of their formation is discussed. 相似文献
8.
1-(3,5-Di-tert-butyl-4-hydroxyphenyl)-2-arylbenzimidazoles were synthesized by the condensation of 2,6-di-tert-butyl-p-benzoquinone imine with aromatic aldehydes. 2-(3,5-Di-tert-butyl-4-hydroxybenzylidene) benzimidazoles were synthesized by the reaction of 2-aminobenzimidazole with 2,6-di-tert-butyl-4-hydroxybenzaldehyde. The substances were characterized by elemental analysis, IR and NMR spectra. The electrochemical
reduction and oxidation of these compounds and phenoxy radicals derived from them was studied by cyclic voltammetry. The stability
of the studied phenoxy radicals was confirmed by the electron spin resonance method. 相似文献
9.
Products of thermolysis of 2,6-di-tert-butyl-4-dimethylaminomethylphenol were determined qualitatively and quantitatively by GLC, UV, and1H NMR methods. The kinetics of the reaction was studied. The thermolysis products were studied as the inhibitors in thermopolymerization
of monomers.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1881–1883, October, 1997. 相似文献
10.
Colin F. Moffat Alister S. McGill Robert S. Anderson 《Journal of separation science》1991,14(5):322-326
Methyl esters were synthesized from lipid extracted by a modified Bligh and Dyer technique. The lipid was saponified and the free fatty acids methylated using boron trifluoride in methanol. Butylated hydroxytoluene (BHT; 2,6-di-tert-butyl-4-methylphenol) was added to the initial sample and to the extracted lipid prior to methyl ester synthesis. Under these conditions, the BHT was derivatized to a range of compounds, some of which can result in misinterpretation of the GC trace. Three components have been characterized by mass spectroscopy. Two of these, which eluted slightly before 16:0 on a polar column, were shown to be 2,6-di-tert-butyl-4-methoxyphenol and 2,6-di-tert-butyl-4-methoxy-methylphenol. The third component, which coeluted with 15:0 on the same column, is 2,6-di-tert-butyl-4-methoxy-5-hydroxyphenol. 相似文献
11.
D. R. Stevenson J. E. Mulvaney 《Journal of polymer science. Part A, Polymer chemistry》1972,10(9):2713-2725
Aromatic polyesters of 3,5-di-tert-butyl-4-hydroxybenzoic acid and 3,5-diisopropyl-4-hydroxybenzoic acid were prepared. The polymers were found to be high-melting but largely insoluble in organic solvents. The polymer based on 3,5-di-tert-butyl-4-hydroxy-benzoic acid was not degraded to monomer by sulfuric acid. A number of new aromatic polyesters were also prepared. Several new monomers for aromatic polyesters were synthesized, including bis(2,5-di-tert-butyl-4-carbophenoxyphenyl)terephthalate, m- and p-phenylene bis(3,5-di-tert-butyl-4-hydroxybenzoate), bis(2,6-di-tert-butyl-4-chlorocarboxyphenyl)terephthalate, and m-phenylene bis(3,5-diisopropyl-4-hydroxybenzoate). An aromatic polyester prepared from bis(2,6-di-tert-butyl-4-chlorocarboxyphenyl) terephthalate and resorcinol had a ηinh (trichloroethylene) of 1.05 (0.5%, 30°C) and a possible melting point of 330°C (DSC). Tough, creasable films could be cast from trichloroethylene solution of this polymer. Attempts to observe or to trap the keto-ketene that might result when 3,5-di-tert-butyl-4-hydroxybenzoyl chloride is treated with base were unsuccessful. 相似文献
12.
M. G. Perevozkina N. M. Storozhok A. P. Krysin V. E. Borisenko 《Russian Chemical Bulletin》2006,55(8):1380-1387
In a model system of initiated oxidation of methyl oleate, the antioxidant activities of 3-hydroxy-2-ethyl-6-methylpyridinesuccinate
(mexidol) and bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propyl] disulfide (SO-4) were studied and compared with those of α-tocopherol and 1-hydroxy-2,6-di-tert-butyl-4-methylbenzene (dibunol). A linear pattern of dependence of the inhibitory effect on the concentration of compounds
was established. The ability of antioxidants to decompose hydroperoxides and inhibit their accumulation was revealed. The
combined inhibitory effects of SO-4 with mexidol, α-tocopherol, and phospholipids were described for the first time. The rate
constant for disproportionation of the SO-4 phenoxyl radicals, k
9 = 0.90·103 L mol−1 s−1, was determined by steady-state photolysis. The rate constant k
10
eff for the reactions of SO-4 phenoxyl radicals with lipids characterized by different unsaturation degrees were determined for
methyl oleate, linolic and arachidonic acids containing one, two, and four multiple bonds, and phospholiopids containing polyunsaturated
fatty acids.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1330–1337, August, 2006. 相似文献
13.
Kurbatov S. V. Simakov V. I. Vikrishchuk N. I. Ruzhnikov A. E. Zhdanov Yu. A. Olekhnovich L. P. 《Russian Journal of General Chemistry》2001,71(5):776-779
A new method was developed for synthesizing benzoxazine derivatives by O-alkylation of 2,6-di-tert-butyl-4-(o-hydroxyphenylimino)-2,5-cyclohexadienones with allyl or benzyl halides and subsequent thermal heterocyclization of allyl or benzyl ethers thus formed. The cyclization of ethers derived from 2,6-di-tert-butyl-4-(o-hydroxyphenylimino)-2,5-cyclohexadienones and phenacyl bromides or diethyl bromomalonate is so fast that these compounds cannot be isolated. 相似文献
14.
I. V. Loginova I. Yu. Chukicheva A. V. Kuchin 《Russian Journal of Organic Chemistry》2011,47(10):1501-1503
Chlorine dioxide was used to oxidize sterically hindered phenols and their derivatives (2,6-di-tertbutylphenol, 2,6-diisobornylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-diisobornyl-4-methylphenol, and 3,5-diisobornyl-4-hydroxybenzaldehyde) in organic solvent. 相似文献
15.
A. I. Shif S. N. Lyubchenko O. Ya. Borbulevych O. V. Shishkin K. A. Lyssenko L. P. Olekhnovich 《Russian Chemical Bulletin》1999,48(1):139-146
Oxidation of 4,6-di-tert-butylpyrogallol gave two dimeric products instead of the expected 4,6-di-tert-butyl-3-hydroxy-1,2-benzoquinone (2). It was established by X-ray diffraction analysis that the first product has the structure
of tetra-tert-butyl-6, 10a-dihydroxy-1,2-dioxo-3,4a,7,9-1,2,4a, 10a-tetrahydrodibenzo-1,4-dioxine. From this it follows that compound 2
undergoes regio- and stereospecific dimerization according to the [2π+4π]-cycloaddition mechanism,viz, the hetero Diels—Alder reaction. The double intensities of the signals in the1H NMR spectrum are indicative of a symmetrical structure of the second product, 2,6,4′, 6′-tetra-tert-butyl-4,4′-dihyroxy-3,5,3′,5′-tetraoxo-4,4′-bi(cyclohexene), which is a racemate of enantiomers formed upon recombination
(r+r orl+l) of the intermediate of oxidation of pyrogallol, namely, of ther,l-stereogenic 3,5-di-tert-butyl-1-hydroxy-2,6-dioxocyclohex-3-enyl radical.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 139–146, January, 1999. 相似文献
16.
G. N. Nugumanova T. A. Barsukova S. V. Bukharov D. B. Krivolapov I. A. Litvinov V. V. Syakaev N. A. Mukmeneva A. R. Burilov 《Russian Journal of General Chemistry》2010,80(7):1341-1344
3-[2-(3,5-Di-tert-butyl-4-hydroxyphenylsulfanyl)acetoxy]2,2-bis[2-(3,5-di-tert-butyl-4-hydroxyphenylsulfanyl) acetoxymethyl]propyl 3,5-di-tert-butyl-4-hydroxyphenylsulfanylacetate was synthesized. Its structure was determined by means of 1H and 13C NMR spectroscopy and X-ray-diffraction analysis. This compound was found to possess high antioxidant activity in the conditions
of auto-oxidation of low-pressure polyethylene. 相似文献
17.
E. N. Cherezova F. B. Balabanova D. P. Shalyminova S. Sh. Saigitbatalova A. G. Liakumovich 《Russian Journal of Applied Chemistry》2014,87(1):42-47
A phenolic antioxidant was synthesized by the reaction of N,N-dimethyl(3,5-di-tert-butyl-4-hydroxybenzyl) amine with cyclohexanone. The infl uence of temperature, reactant ratio, pressure, and time on the yield of the product, 2,6-bis(3,5-di-tert-butyl-4-hydroxybenzyl)cyclohexanone, was examined. The antioxidant obtained, taken both separately and in synergistic mixtures with alkylphenol and phosphites, showed high performance in inhibition of the thermal aging of ethylene-propylene rubber. 相似文献
18.
A. E. Prosenko A. A. Skorobogatov O. I. Dyubchenko P. I. Pinko N. V. Kandalintseva M. M. Shakirov L. M. Pokrovsky 《Russian Chemical Bulletin》2007,56(6):1119-1124
Reactions of 4-alkyl-2,6-di-tert-butylphenols containing OH, SH, COOH, and COOMe groups in their para substituents with hydrogen chloride and hydrohalic acids were studied. One-step transformations of 2,6-di-tert-butyl-4-(ω-hydroxyalkyl)phenols to the corresponding 4-(ω-halogenoalkyl)phenols, as well as of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and its esters to phloretic acid were proposed. 4-(3-Mercaptopropyl)phenol upon heating
with conc. HBr undergoes condensation to 3-(4-hydroxyphenyl)propyl 4-(3-mercaptopropyl)phenyl sulfide as the main product.
Dedicated to the memory of Academician N. N. Vorozhtsov on the 100th anniversary of his birth.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1078–1083, June, 2007. 相似文献
19.
Dialkyl [(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]phosphonates reacted with phenol and benzenediols in the presence of trifluoromethanesulfonic acid to give products of electrophilic substitution in the benzene ring, the corresponding diarylmethylphosphonates or [phenylenebis(arylmethylene)]- diphosphonates. The reaction of diphenyl [(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]phosphonate with 2-methylbenzene-1,3-diol at a ratio of 1: 1 afforded 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-6-hydroxy-7-methyl-2-phenoxy-2,3-dihydro-1,2λ5-benzoxaphosphol-6-one. 相似文献
20.
Ismagilov R. K. Moskva V. V. Mosunova L. Yu. Romakhin A. S. 《Russian Journal of General Chemistry》2001,71(10):1547-1549
3,3',5,5'-Tetra-tert-butylstilbene quinone and 1,2-bis(3,5-di-tert-butyl-4-hydroxyphenyl)-1,2-bis-(diethoxyphosphinoyl)-ethane were isolated from a mixture of products of the reaction of equivalent amounts of diethyl hydrogen phosphite and 3,5-di-tert-butyl-4-hydroxybenzaldehyde. A scheme of chemical transformations in this reaction system was offered. 相似文献