共查询到20条相似文献,搜索用时 453 毫秒
1.
V. B. Vol'eva T. I. Prokofeva A. I. Prokofev I. S. Belostotskaya N. L. Komissarova V. V. Ershov 《Russian Chemical Bulletin》1995,44(9):1720-1724
The interaction of 3,6-di-tert-butyl-ortho-benzoquinone (1) and 3,5-di-tert-butyl-ortho-benzoquinone (2) with NH3 in water—alcohol medium and with (NH4)2CO3 in a solid phase has been studied. Redox processes with participation of a nucleophile of the medium take place for1, while2 reacts with NH3 at the carbonyl group with transformation of the quinone imide. The mechanism of redox transformation of1 has been proposed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1789–1793, September, 1995.This work was carried out with financial support from the Russian Foundation for Basic Research (Project No. 94-03-08653). 相似文献
2.
V. I. Minkin M. S. Korobov R. Ya. Olekhnovich G. S. Borodkin L. E. Nivorozhkin 《Russian Chemical Bulletin》1995,44(11):2168-2171
Kinetics and reaction mechanisms governing inversion of the tetrahedral configuration at the metal center in the series ofbis-chelate Zn(II) complexes of 3,2-, 1,2-, and 2,1-oxy(mercapto)naphthaldimines, respectively4–6, have been studied with the use of dynamic1H NMR spectroscopy. A polytopal rearrangement of the diagonal twist type has been found to be an energetically preferable pathway of the inversion reaction for complexes4 and5 with a ZnN2O2 coordination site, whereas the inversion reaction for complexes with a ZnN2S2 coordination site occurs by an intramolecular dissociation-recombination pathway that involves cleavage of a Zn-N coordination bond. In the case of complexes6, the inversion reaction is governed mainly by intramolecular degenerate ligand exchange reactions.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11. pp. 2261–2265, November, 1995.This work was supported by the Russian Foundation for Basic Research (project No. 93-03-18692) and the International Science Foundation (grant No. RNJ 000). 相似文献
3.
G. D. Gamalevich A. V. Ignatenko E. P. Serebryakov N. E. Voishvillo 《Russian Chemical Bulletin》1995,44(4):743-748
With a view to obtaining both enantiomers of 3-(4-methoxycarbonyl)phenyl-2-methyl-1-propanols, (R)-1 and (S)-1, from the respective racemate, (±)-1, the hydrolysis of its acetate, (±)-2, in the presence of porcine pancreatic lipase (PPL) has been studied. The optical puriry of (R)-1 and (S)-1 thus obtained was unsatisfactory (ee 22–27%), and could not be increased beyondee 33% by repeated enzymatic hydrolysis of the unconverted fraction of the acetate. In contrast with this, the biohydrogenation of 3-(4-methoxycarbonyl)phenyl-2-methyl-2-propen-1-ol (4) with fermentingSaccharomyces cerevisiae afforded (S)-1 of considerably higher optical purity (ee 41–90 %, depending on the strain). The stereochemical correlation of the products obtained in the two biochemical processes under study shows that the PPL-catalyzed hydrolysis of (±)-2 produces preferably (R)-1.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 761–766, April, 1995.The authors express their gratitude to the Russian Foundation for Basic Research for financial support (Grant No. 93-03-5893). 相似文献
4.
E. V. Babaev A. A. Bush I. A. Orlova V. B. Rybakov I. Iwataki 《Russian Chemical Bulletin》2005,54(1):231-237
A new procedure was developed for the synthesis of 2-aminothiazolo[3,2-a]pyridinium salts 8 by the reaction of 2-halo-N-phenacylpyridinium salts with KSCN. The anion compositions of salts 8 were studied by ion chromatography. Acylation of salts 8 afforded representatives of the previously unknown bicyclic mesoionic thiazolo[3,2-a]pyridinium 2-imidate system 9. The three-dimensional structures of 2-amino-3-(p-bromobenzoyl)thiazolo[3,2-a]pyridinium thiocyanate and N-trifluoroacetyl-3-(p-nitrobenzoyl)thiazolo[3,2-a]pyridinium 2-imidate were established by X-ray diffraction analysis.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 226–232, January, 2005. 相似文献
5.
A. Ya. Usyatinsky O. B. Zhidkova P. V. Petrovskii V. I. Bregadze 《Russian Chemical Bulletin》1994,43(4):671-674
Electrophilic mercuration of cobaltacarboranes 1,2-R2-3-Cp-3,1,2-CoC2B9H9 (1) where R = H (1a), CH2OH (1b) was studied. Dimercurated complexes containing Hg atoms bound with boron atoms in positions 9 and 12 of the dicarbollyl ligand are the main products of the reaction with strong electrophiles such as mercury acetate or trifiuoroacetate in the corresponding acids. Mercuration of1a under milder conditions,i.e., with Hg(OCOCF3)2 in CH2Cl2 or Hg(OAc)2 in a CH2Cl2-AcOH mixture, affords 9-monomercurated complexes as the main products.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 719–722, April, 1994.This work was carried out with the financial support of the Russian Foundation for Basic Research (project No. 93-03-18654). 相似文献
6.
E. D. Tenetova M. I. Dobrikov G. V. Shishkin V. D. Shteingartz 《Russian Chemical Bulletin》1998,47(2):321-326
The synthesis of new heterobifunctional reagents that are photo-activated, namely, 6-azido-1,3,4,5,7,8-hexafluoro-2-naphthoic
acid (2), succinimido-6-azido-1,3,4,5,7,8-hexafluoro-2-naphthoate (3), andN-(n-butyl)-1,3,4,5,7,8-hexafluoro-2-naphthamide (4), which simulates the product of addition of acid2 to biopolymers, is described. The photolysis of azides2 and4 in methanol and pyridine was studied. Azide4 is superior to photoreagents based on perfluoroaromatic azides of the benzene series in spectral photosensitivity and rate
of photolysis in the UV region (334–405 nm). When azide4 is irradiated with light at wavelengths above 400 nm, the rate of its photolysis in methanol increasesca. 10-fold in the presence of a singlet sensitizer, 9-aminoacridine, which makes reagent3 promising for designing binary systems sensitive to visible light.
For Part 8, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 328–333, February, 1998. 相似文献
7.
V. A. Tartakovsky I. E. Filatov A. M. Churakov S. L. Ioffe Yu. A. Strelenko V. S. Kuz’min G. L. Rusinov K. I. Pashkevich 《Russian Chemical Bulletin》2004,53(11):2577-2583
Treatment of 2- and 4-amino-3-(tert-butyl-NNO-azoxy)pyridines with nitrating agents (N2O5or NO2BF4) afforded the first representatives of pyridoannelated 1,2,3,4-tetrazine di-N-oxides, viz., pyrido[2,3-e][1,2,3,4]tetrazine 1,3-dioxide (9), 7-nitropyrido[2,3-e][1,2,3,4]tetrazine 1,3-dioxide (10), and pyrido[3,4-e][1,2,3,4]tetrazine 2,4-dioxide (11). These compounds were studied by 1H, 13C, and 14N NMR spectroscopy. The 1:1 complex of compound 10 with benzene was studied by X-ray diffraction analysis.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2471–2477, November, 2004. 相似文献
8.
V. Y. Kavun V. I. Sergienko S. P. Gabuda R. L. Davidovich 《Journal of Structural Chemistry》2000,41(4):597-602
Ionic mobility in (NH4)2HfF6 (I), Tl2HfF6 (II), and NH4TlHfF6 (III)has been studied by
1H and19F NMR in the temperature range 160-440 K. Types of ionic motion are determined, and activation energies are estimated. Phase
transitions are found at ≈390 and ≈365 K forII
and
III.
Compounds I and
III are assumed to be superionic conductors in the temperature range 370-420 K.
Translated fromZhurnal Strukturnoi Khimii, Vol. 41, No. 4, pp. 730-736, July-August, 2000
We are grateful to V. B. Logvinova for performing syntheses of the compounds. This work was supported by RFFR grant Nos. 99-03-32672a
and 99-03-32477. 相似文献
9.
A. M. Churakov O. Yu. Smirnov S. L. Ioffe Yu. A. Strelenko V. A. Tartakovsky 《Russian Chemical Bulletin》1994,43(9):1532-1535
2-(tert-Butyl-NNO-azoxy)aniline was prepared by selective reduction of 2-(tert-butyl-NNO-azoxy)nitrobenzene. Its bromination yielded the correspondingpara-bromo- andortho, para-dibromoanilines (3a,b).meta-Bromoanilines (6a,b) were synthesized by selective replacement of theortho-bromine atoms in ortho,para-bromo(tert-butylazoxy)benzenes (5a,b) by ammonia in toluene under pressure.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1620–1623, September, 1994.This work was carried out with the financial support of the Russian Foundation for Basic Research (Project No. 93-03-18461). 相似文献
10.
L. O. Nindakova N. N. Chipanina V. K. Turchaninov M. V. Ustinov B. A. Shainyan 《Russian Chemical Bulletin》2005,54(10):2343-2347
The reaction of di-μ-chlorobis(1,5-cyclooctadiene)dirhodium with (4S, 5S)-2,2-dimethyl-4,5-bis(methylaminomethyl)-1,3-dioxolane (1) gave the complex [Rh(cod)(1)]Cl (cod is 1,5-cyclooctadiene). The composition of the complexes CoCl2 · L2 and [Rh(cod)(L2)]X (L2 = 1, (4S,5S)-2,2-dimethyl-4,5-bis(aminomethyl)-1,3-dioxolane, and (4S, 5S)-2,2-dimethyl-4,5-bis(dimethylaminomethyl)-1,3-dioxolane; X = Cl, TfO) was studied using IR and 1H NMR spectroscopy. In the RhI cyclooctadienediamine complexes, the diene molecule forms a stronger bond with the metal atom than that in the cyclooctadienediphosphine
analogs.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2270–2274, October, 2005. 相似文献
11.
Yu. V. Tomilov I. P. Klimenko E. V. Shulishov O. M. Nefedov 《Russian Chemical Bulletin》2000,49(7):1207-1211
N-(2-Methylenecyclopropyl)-N-nitrosourea (2) was synthesized for the first time (yield 70%) and its decomposition induced by bases was studied. In particular, treatment
with MeONa/MeOH at-30°C in the presence of methyl methacrylate gives the corresponding I-pyrazoline stereoisomers, the products
of [3+2]-cycloaddition of diazo-2-methylene-cyclopropane (1) generatedin situ. Decomposition of2 on treatment with K2CO3 at 0–5°C in the presence of acrylonitrile also proceeds as [3+2]-cycloaddition: however, the expected 2-pyrazoline easily
isomerizes into 5(3)-isopropenyl-3(5)-cyanopyrazole. Buta1,2,3-triene is the main product of base-induced decomosition of2 in the absence of unsaturated substrates.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1210–1214, July, 2000. 相似文献
12.
V. Y. Kavun V. I. Sergienko S. P. Gabuda R. L. Davidovich 《Journal of Structural Chemistry》2001,41(4):597-602
Ionic mobility in (NH4)2HfF6 (I), Tl2HfF6 (II), and NH4TlHfF6 (III)has been studied by
1H and19F NMR in the temperature range 160-440 K. Types of ionic motion are determined, and activation energies are estimated. Phase
transitions are found at ≈390 and ≈365 K forII
and
III.
Compounds I and
III are assumed to be superionic conductors in the temperature range 370-420 K.
Translated fromZhurnal Strukturnoi Khimii, Vol. 41, No. 4, pp. 730-736, July-August, 2000
We are grateful to V. B. Logvinova for performing syntheses of the compounds. This work was supported by RFFR grant Nos. 99-03-32672a
and 99-03-32477. 相似文献
13.
V. P. Kirin V. A. Maksakov A. V. Virovets P. A. Petukhov S. A. Popov A. V. Tkachev 《Russian Chemical Bulletin》2000,49(8):1440-1447
Reactions of the triosmium clusters Os3(CO)11(NCMe) (1) and Os3(CO)10(NCMe)2 (2) with terpene derivatives,viz., (1S,3S,4R,6R)-3-(N,N-dimethylamino)-4-amino-3,7,7-trimethylbicyclo [4.1.0]heptane (3). (3bR,4aR)-(3,4,4-trimethyl-3b,4,4a,5-tetrahydrocyclopropa [3,4]cyclopenta[1,2-c]pyrazol-1-yl)acetic acid (4a), and (3bR,4aR)-3-(3,4,4-trimethyl-3b, 4,4a,5-tetrahydrocyclopropa[3,4]cyclopenta[1,2-c]pyrazol-1-yl)propionic acid (4b), were studied. A complex with the terminally coordinated ligand is formed in the first step of the reaction of diamine3 with cluster1. Heating of the resulting complex is accompanied by activation of one of the methyl groups of the ligand to form diastereomers
with the bridging tricyclic dihydroimidazole ligand. One of these diastereomers was studied by X-ray diffraction analysis
and its absolute configuration was established. Pyrazolycarboxylic acids react with cluster2 as simple organic acids and are coordinated as a bridge at the Os—Os bond through the carboxyl group.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1447–1454, August, 2000. 相似文献
14.
N. K. Artemova V. A. Smirnov B. G. Rogachev G. V. Shilov S. M. Aldoshin 《Russian Chemical Bulletin》2006,55(9):1605-1611
1′,3′,3′-Trimethyl-6-nitro-8-pyridiniomethylspiro[2H-[1]benzopyran-2,2′-indoline] chloride (1) was synthesized. Single crystals (crystal hydrates) of the open merocyanine form of compound 1 were obtained under the dark conditions, and their crystal structure was studied. On irradiation with visible light compound
1 crystallizes from propan-2-ol in the polycrystalline closed form. The spectral and photochemical properties of compound 1 in the polycrystalline state and the kinetic characteristics on thermal transformation of the closed form to the open form
were studied.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1548–1553, September, 2006. 相似文献
15.
D. P. Krut'ko M. V. Borzov A. V. Churakov D. A. Lemenovśkii O. A. Reutov 《Russian Chemical Bulletin》1998,47(11):2280-2285
ansa{·5,·5′-[1,1′-(1-silacyclopent-3-ene-1,1-diyl)bis(indenyl)]} dichlorozirconium (1a,b) was synthesized. The crystal structure ofmeso-[(1,4-CH2CH=CHCH2)Si(C9H6)2ZrCl2] (1b) was established by X-ray diffraction analysis. Photoinduced interconversion of the racemic (1a) andmeso forms was studied under various conditions. The photostationary state (rac: meso=55∶45) was established rapidly when solutions ofansa-zirconocene were irradiated with visible light.
Deceased
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2351–2356, November, 1998. 相似文献
16.
X. K. Xia L. G. Yang Z. G. She C. L. Shao Z. J. Huang F. Liu Y. C. Lin S. N. Zhou 《Chemistry of Natural Compounds》2008,44(4):416-418
Two new acids 1 and 2, together with a known compound, purpactin A (3), were isolated from endophytic fungus No. ZZF13. Their structures were elucidated on the basis of 1D, 2D NMR, and HREIMS
spectra.
Published in Khimiya Prirodnykh Soedinenii, No. 4, pp.336-337, July-August, 2008. Original articlesubmitted April 24, 2007. 相似文献
17.
M. E. Gurskii S. B. Golovin M. O. Dekaprilevich Yu. T. Struchkov Yu. N. Bubnov 《Russian Chemical Bulletin》1995,44(7):1262-1268
3,4-Dimethylene-1,6-hexane diols2 obtained by allylboration of ketones with 2,3-dimethylene-1,4-bis(dipropylboryl)butane1 undergo cyclization on treatment with I2/NaHCO3 to give 1,5-cis-di(iodomethyl)-2,6-dioxabicyclo[3.3.0]octanes (4) and/or 3,8-dioxabicyclo[4.4.0]dec-1(6)-enes (5). 4,4,9,9-Tetramethyl-3,8-dioxacyclodeca-1,6-dione (9) was synthesized by ozonolysis of bicyclic compound5b. The structure of compound5e was confirmed by X-ray diffraction analysis.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1308–1314, July, 1995.This study was financially supported by the Russian Foundation for Basic Research (Grant No. 94-03-18193) and the International Science Foundation (Grant No. M3Y000). 相似文献
18.
The reaction of poly- and perfluoroaldehyde hydrazones with hydrazine hydrate was studied. A new preparative method for obtaining the hitherto inaccessibleN,N-unsubstituted bis-hydrazones of polyfluorinated -oxoaldehydes was developed based on this reaction.For Part 2, seeIzv. Akad. Nauk, Ser. Khim., 1995, 2465 [Russ. Chem. Bull, 1995,44, 2360 (Engl. Transl.)].Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2526–2527, December, 1995.This study was financially supported by the Russian Foundation for Basic Research (Grant No. 94-03-08548) and the International Science Foundation (Grant Nos. NDL 000 and NDL 300). 相似文献
19.
E. V. Tretyakov A. S. Bogomyakov E. Yu. Fursova G. V. Romanenko V. N. Ikorskii V. I. Ovcharenkoa 《Russian Chemical Bulletin》2006,55(3):457-463
The molecular and crystal structures of porphyrexides, viz., 4-amino-2-imino-(1) and (Z)-2-amino-4-bromoimino-5,5-dimethyl-4,5-dihydro-1H-imidazole 1-oxyls (7), and their diamagnetic precursors were determined. Compound 1 is kinetically unstable because it is oxidized with atmospheric oxygen to form (E)-1,2-bis[1-amino-1-(cyanoimino)-2-methyl-propan-2-yl]diazene 1,2-dioxide.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 441–447, March, 2006. 相似文献
20.
V. I. Minkin S. M. Aldoshin V. N. Komissarov I. V. Dorogan Yu. A. Sayapin V. V. Tkachev A. G. Starikov 《Russian Chemical Bulletin》2006,55(11):2032-2055
A new method was developed for the synthesis of functionalized β-tropolones based on acid-catalyzed condensation of 2-methylquinoline
derivatives with 3,5-di(tert-butyl)-1,2-benzoquinone and 4,6-di(tert-butyl)-3-nitro-1,2-benzoquinone (14). The mechanism of the multistep reaction giving rise to β-tropolones and their tautomerism were studied by quantum chemical
methods (DFT B3LYP/6-31G**). The reaction of 2-methylquinoline derivatives containing the tertiary amino group at position
4 with quinone 14 is accompanied by the formation of derivatives of a new heterocyclic system, viz., 4,6-dioxo-2-azabicyclo[3.3.0]octa-2,7-diene N-oxide. The molecular and crystal structures of two 5,7-di(tert-butyl)-3-hydroxy-2-(quinolin-2-yl)tropolones and two dioxoazabicyclooctadiene N-oxides, as well as of the preparatively isolated intermediate of the first condensation step and of the by-product of the
reaction were established by X-ray diffraction.
Dedicated to Academician O. M. Nefedov on the occasion of his 75th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1956–1977, November, 2006. 相似文献