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991.
L. M. Pisarenko T. V. Maksimova Z. S. Kartasheva O. T. Kasaikina 《Russian Chemical Bulletin》2003,52(7):1500-1503
The temperature effect on the rate of the decomposition of hydroperoxides and the rate of the formation of free radicals in the oxidation of ethylbenzene with molecular oxygen in the presence of -phenylethyl hydroperoxide—cetyltrimethylammonium bromide (CTAB) as a catalytic system for free radical generation was studied by kinetic methods (from the oxygen consumption and hydroperoxide decomposition rates) and the inhibition method involving different acceptors of free radicals. 相似文献
992.
T. M. Ugurchieva A. V. Lozanova M. V. Zlokazov V. V. Veselovsky 《Russian Chemical Bulletin》2007,56(8):1544-1549
trans-Stereoselective electrophilic cyclization of (2R*,SS*)-N, N-diisopropyl-2-phenylsulfinylpent-4-enamide under the action of bromine afforded (3R*,5S*, SS*)-N-(5-bromomethyl-3-phenylsulfinyltetrahydrofuran-2-ylidene)-N,N-diisopropylammonium bromide. Its transformations under the conditions of hydrolysis, dehydrobromination, and hydride reduction
were studied.
Dedicated to Academician V. A. Tartakovsky on the occasion of his 75th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1485–1490, August, 2007. 相似文献
993.
The direction of the reaction of anthranilic acids with o-bromomethylphenylacetonitrile upon fusion depends on the temperature
and nature of the substituent in the anthranilic acid. The reaction may lead to three types of products: Derivatives of 7,12-dihydro-5H-isoquino[2,3-a]quinazolin-5-ones
below 150°C and to 6,11-dihydro-13H-isoquino[3,2-b]quinazolin-13-one or derivatives of 6H,12H,17H-dibenzo[3,4:6,7][1,8]naphthyridino[1,8-ab]quinazoline-6,17-diones
above 150°C depending on the nature of the substituent in the anthranilic acid. A study was carried out on the mechanism for
the formation of 6H,12H,17H-dibenzo[3,4:6,7][1,8]naphthyridino[1,8-ab]quinazoline-6,17-diones, which permitted the preparation
of 6-(4-methylphenyl)-6,12-dihydro-5H-isoquino[2,3-a]quinazolin-5-one.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1059–1067, July, 2007. 相似文献
994.
2,5-二[4-(2-芳基乙烯基)苯基]噁二唑的合成及发光特征 总被引:6,自引:0,他引:6
二乙烯联苯及其衍生物是一种可发射蓝光的小分子空穴型有机发光材料, 通过Wittig-Horner反应, 将电子传输型噁二唑环“嵌入”其中, 设计合成了6个2,5-二[4-(2-芳基乙烯基)苯基]-1,3,4-噁二唑化合物. 经光谱分析和元素分析等方法确认了它们的化学结构. IR和UV-vis分析数据表明标题化合物分子结构中的C=C双键均为反式结构特征. 研究结果表明: 2,5-二[4-(2-对二甲氨基苯基乙烯基)苯基]-1,3,4-噁二唑具有良好的蓝色发光性能; 取代基对标题化合物的UV-vis吸收光谱和发光特性的影响显着. 相似文献
995.
Atovmyan E. G. Nikonova L. A. Filipenko O. S. Fedotova T. N. Aldoshin S. M. 《Russian Chemical Bulletin》2002,51(1):99-104
N"-Substituted isonicotinic hydrazides of the general formula Py—C(=O)—N(H)-N"=C(H)—R, where R is o- (1), m- (2), or p-nitrophenyl (3), were studied by IR spectroscopy and X-ray diffraction analysis. The position of the nitro group in these compounds has no effect on the type of the crystal structure. The crystal packings are based on stacks consisting of antiparallel planar molecules. The molecules from the adjacent stacks are linked to each other via the N—H...NPy hydrogen bonds. Depending on the position of the nitro group, the N...NPy distance increases in the series 3 > 1 > 2 and the energy of the hydrogen bonds decreases (according to the IR spectroscopic data) from 3.9 to 3.1 kcal mol–1. Analysis of the IR spectra demonstrated that the intensity of absorption in the (C—H) stretching region of the pyridine ring increases substantially as the the N—H...NPy hydrogen bond is strengthened. Some regularities of the changes, which are observed for the (NO2) bands in the spectra of the nitrophenyl-containing conjugated molecules in solutions, persist in the crystalline state. 相似文献
996.
Summary A sensitive LC method for the detection of amino acids and oligopeptides with pre-column fluorescence derivatization has been
developed. Glycine, glycylglycine, triglycine, glutathione, glutamic acid, and cysteine were separated on a reversed-phase
C18 column with methanol-water-triethylamine eluent, derivatization and chromatographic conditions were optimized. The six derivatives
were eluted in 20 min with good reproducibility. The relative standard derviations (n=6) at an analytical concentration of
2×10−6 M are <5%. Detection limits (signal-to-noise ratio=3) for the six derivatives are 23–68 fmol. 相似文献
997.
G. A. Atazhanova A. T. Kulyyasov A. D. Dembitskii V. A. Raldugin M. M. Shakirov I. Yu. Bagryanskaya Yu. V. Gatilov S. M. Adekenov G. A. Tolstikov 《Chemistry of Natural Compounds》2000,36(2):152-155
The oxime of artemisia ketone is smoothly converted to the pyrazole derivative by sodium nitrite and acetic acid in CHCl3. The structure of the pyrazole was found by x-ray structural analysis. The PMR and13C NMR spectra were interpreted using two-dimensional1H–13C NMR (COSY, COLOC).Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 121–123, March–April, 2000. 相似文献
998.
The first γ-trimethylstannyl sulfimide, Me3Sn(CH2)3S(=NSO2Ar)C5H11-n, was synthesized by oxidative imination of Me3Sn(CH2)3SC5H11-n with ArSO2(Na)Cl (Ar=C6H4Cl-4). Oxidation of γ-trimethylstannyl sulfimide by an alkaline solution of H2O2 gave γ-trimethylstannyl sulfoximide, Me3Sn(CH2)3S(O)(=NSO2Ar)C5H11-n, and γ-trimethylstannyl sulfone, Me3Sn(CH2)3SO2C5H11-n, the latter compound resulting from hydrolysis of the arylsulfimide group. Oxidation of stannyl sulfide by hydrogen peroxide
yielded γ-trimethylstannyl sulfoxide, Me3Sn(CH2)3S(O)C5H11-n (under mild conditions) or γ-trimethylstannyl sulfone (under more severe conditions).
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 371–374, February, 1997. 相似文献
999.
Keita Hamasaki Asao Nakamura Akihiko Ueno Fujio Toda 《Journal of inclusion phenomena and macrocyclic chemistry》1992,13(4):349-359
The effects of -cyclodextrin (-CyD), heptakis(2,6-di-O-methyl)--cyclodextrin (DMCyD) and heptakis(2,3,6-tri-O-methyl)--cyclodextrin (TMCyD) ontrans-cis photoisomerization of 1-ethyl-4-(4-hydroxystyryl)pyridinium (POH) have been studied in aqueous solutions. The ratio of [cis]/[trans] for POH in the photostationary state at pH 8.54 was remarkably reduced by the presence of CyD or DMCyD. The reduction of the [cis]/[trans] ratio in the photostationary state was explained in terms of the shift of the equilibrium of POH
+
trans
PO
trans
+ H– toward PO
trans
formation. The binding constants of CyD and DMCyD for PO
trans
were 2.00- and 1.36-fold larger than those for POH
+
trans
, respectively. The binding constants of TMCyD for both species are much smaller than those of CyD and DMCyD. This result indicates that PO
trans
, which has a betain structure, forms stable complexes with CyD and DMCyD with its hydrophobic parts inside and the charged parts outside the CyD cavities. 相似文献
1000.