共查询到20条相似文献,搜索用时 15 毫秒
1.
M. V. Sigalov E. Yu. Shmidt S. E. Korostova B. A. Trofimov 《Chemistry of Heterocyclic Compounds》1991,27(8):832-836
In the reaction of 1,4-bis(1-vinyl-2-pyrrolyl)benzene with hydrogen chloride and hydrogen bromide the hydrogen halide adds at the vinyl groups, and -protonation takes place in both pyrrole rings. In reaction with the superacidic system HSO3F+SbF5 (in SO2ClF) position 5 of one heterocycle and position 4 of the other are protonated with retention of the vinyl groups.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1041–1045, August, 1991. 相似文献
2.
K. A. Andrianov V. I. Pakhomov V. M. Gel'perina 《Chemistry of Heterocyclic Compounds》1968,4(3):410-411
The ammonolysis of 1,4-bis(dimethylchlorosilyl)benzene with ammonia forms heterocyclic compounds of low molecular weight. The main reaction product is the crystalline [CH3)2SiC6H4Si(CH3)2NH]4, which polymerizes on heating with the formation of polymers possessing a relative viscosity of 0.15–0.4. 相似文献
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E. N. Rasadkina P. V. Slitikov A. I. Stash E. E. Nifant’ev 《Russian Chemical Bulletin》2005,54(2):449-451
1,4-Bis(hydroxymethyl)benzene undergoes bisphosphorylation with P(NEt2)3 at room temperature. The reaction produces no cyclic structures.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 440–442, February, 2005. 相似文献
5.
Ying-Hung So 《Journal of polymer science. Part A, Polymer chemistry》1997,35(11):2143-2145
High molecular weight poly(phenylenebenzobisoxazole) (PBO) was synthesized from 1,3-diamino-4,6-dihydroxybenzene dihydrochloride (1) and 1,4-bis(trichloromethyl)benzene (3) in polyphosphoric acid (PPA) or a mixture of PPA and methanesulfonic acid. When PPA was used as the solvent, 3 was first converted in situ to terephthalic acid before 1 was added to minimize degradation of 1. Compound 3 did not need to be sealed from atmospheric moisture because the trichloromethyl groups were not moisture sensitive. It was not necessary to use micronized 3. Adjustment of P2O5 content was optional for this reaction because no water was liberated from the condensation of 1 and 3. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35 : 2143–2145, 1997 相似文献
6.
XiaoBangDUAN GuoPingCAI WilliamP.WEBER PingLU 《中国化学快报》2005,16(3):405-408
Silicon inserted n conjugated copolymer was synthesized by Heck reaction with moderate molecular weight. This silicon containing copolymer is thermally stable to 400℃, while emission of this polymer is blue-shifted compared with polyphenylenevinylene greenish emission. It shows potential application as organic emitter in OLED. 相似文献
7.
A fast, mild, and practical microwave-assisted protocol for synthesis of 1,4-bis(difluoromethyl)benzene from 1,4-bis(dichloromethyl)benzene and KF was developed. The new protocol increased the yield and reduced the reaction time significantly in contrast to the conventional heating procedure. Also, the synergistic effect of a composite phase transfer catalyst was studied. 相似文献
8.
Vergil Percec James H. Wang Shigeru Okita 《Journal of polymer science. Part A, Polymer chemistry》1991,29(12):1789-1800
This article describes the synthesis and the cation-radical polymerization (Scholl reaction) of 1,3-bis[4-(1-naphthoxy) benzoyl] benzene ( 6 ) and 1,4-bis[4-(1-naphthoxy) benzoyl]- benzene ( 7 ) initiated by FeCI3. This polymerization produced poly(ether ether ketone ketone)s (PEEKK) of number average molecular weight (M?n) up to 5400 g/mol. The synthesis of bis[4-(1-naphthoxy) phenyl] methane ( 8 ), 1,3-bis[4-(1-napthoxy) phenylmethyl] benzene ( 9 ), and 1,4-bis[4-(1-naphthoxy) phenylmethyl] benzene ( 10 ) are also described. Polyethers of M?n up to 15400 g/mol at a FeCl3/monomer molar ratio of 2/1 were obtained. An increased polymerizability of the monomers 9 and 10 containing two CH2 groups versus that of the corresponding monomers containing two carbonyl groups ( 6 and 7 ) was observed. This enhanced polymerizability was explained based on the increased nucleophilicity of monomers 9 and 10 . 相似文献
9.
L.G. Romanova A.V. Kukhta A.N. Zavilopulo A.S. Agafonova O.B. Shpenik 《International journal of mass spectrometry》2009,279(1):10-14
Dissociative ionization of 1,4-bis(2,5-phenyloxazolyl)benzene (POPOP) molecule by electron impact in gaseous phase is studied. Potentials of appearance of some fragments of the molecule under study are determined from the experimentally measured dependences of ionization cross-section on the ionizing electron energy. A new ion with m/z = 144 [C9H6ON]+ is detected in the mass spectrum of the POPOP molecule, being complementary to the fragment with m/z = 220 [C15H10ON]+. The threshold of appearance of this ion is determined (Eap = 9.51 eV) as well as the first ionization potential of the POPOP molecule and fragment ion appearance potentials. 相似文献
10.
A. V. Shastin L. B. Romanova L. T. Eremenko V. V. Zakharov G. V. Lagodzinskaya G. G. Aleksandrov I. L. Eremenko 《Russian Chemical Bulletin》2006,55(8):1452-1454
1,4-Bis(chloromethyl)-and 1,4-bis(bromomethyl)cubanes were synthesized by the reactions of triphenylphosphine with CCl4 and
NBS, respectively. The structures of the compounds were studied by X-ray diffraction analysis.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1399–1401, August, 2006. 相似文献
11.
B. A. Trofimov M. V. Markova L. V. Morozova A. I. Mikhaleva E. Yu. Shmidt N. V. Zorina Sang Heon Hyun 《Polymer Science Series B》2010,52(3-4):193-197
Polymers of 1,4-bis[2-(N-vinyl)pyrrolyl]benzene with free N-vinyl groups in side chains are synthesized in the presence of AIBN (2–5 wt %, 70°C) with a yield of up to 34% and a molecular mass of up to 11.5 × 103. In the presence of cationic catalysts (Me3SiCl, the LiBF4-dimethoxyethane system, and BF3 · OEt2), 1,4-bis[2-(N-vinyl)pyrrolyl]benzene gives macromolecules with alternating 1,2-pyrrolene and ethylidene units in the backbone with yields of 80, 44, and 33%, respectively. The polymers demonstrate paramagnetic and luminescent properties. 相似文献
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J. Selvakumar D. Sathiyamoorthy K. S. Nagaraja 《Journal of Thermal Analysis and Calorimetry》2012,109(1):113-122
The solid-state kinetics and gas-phase predictions of the 1,4-bis(trimethylsilyl)benzene (TMSB) are visualized by utilizing thermogravimetric and mass spectral data. The statistical analyses and reduced time plots of zero order (F0) and Avrami-Erofeev (A2) nucleation and growth models provides the best fit to experimental data for isothermal evaporation process for TMSB. The activation energy for non-isothermal evaporation processes of TMSB is calculated using isoconversional methods. The molecular structure and energetics of the predicted gas phase molecules and species in chemical vapor deposition process are investigated using semi-empirical quantum chemical calculations. 相似文献
15.
采用水热法成功合成了两个基于2,3,5,6-四氟-二(1,2,4-三氮唑-1-甲基)苯(Fbtx)及1,4-萘二甲酸(H2NDC)混合配体的配位聚合物,分子式分别为{[Co(NDC)(Fbtx)(H2O)2]·0.5H2NDC}n(1, CCDC: 1978985)和{[Cu(NDC)(Fbtx)(H2O)]·1.5H... 相似文献
16.
Min Liu Xiuping Li Juan Li Wenhao Sun Zhipei Yang Fangbing Gong Jun Chen Jinshi Ma Guoqiang Yang 《Transition Metal Chemistry》2009,34(2):185-190
Two Co(II) coordination polymers, [Co(Hbtc)(bix)]
n
, (1) and [Co(1,4-bdc)(bix)H2O]
n
(2) (bix = 1,4-bis(imidazole-1-ylmethyl)benzene; H3btc = benzene-1,3,5-tricarboxylic acid; 1,4-H2bdc = benzene-1,4-dicarboxylic acid) have been synthesized under hydrothermal conditions and structurally characterized. X-ray
structure analysis reveals that in polymer 1, 2D infinite grid-like frameworks are interconnected by hydrogen-bond interactions to result in a 3D supramolecular architecture,
in which the three carboxylate groups of the H3btc molecule adopt three different coordination modes. In polymer 2, 1,4-bdc ligands with cobalt atoms construct 1D zigzag chains which are bridged by bix ligands to form a 3D framework. 相似文献
17.
G. X. Liu X. L. Xu Y. Y. Xu S. Nishihara X. M. Ren 《Russian Journal of Coordination Chemistry》2011,37(3):202-210
Two new metal-organic frameworks, namely, Cd(BDC)(Btx) · 0.25(H2O) (I) and Co3(BDC)3(Btx)4(H2O)4 (II) (H2BDC = 1,4-terephthalate acid and Btx = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, TGA, and single crystal X-ray diffraction. Complex I exhibits a scarcely reported an eight-connected (424.64) net with dinuclear cadmium clusters as secondary building units, whereas complex II displays a three-dimensional co-ordination polymer with a rare (4,6)-connected net described by the (44.62)2(48.67) Schläfli symbol. In addition, the luminescence measurements reveal that complex I exhibits strong fluorescent emissions in the solid state at room temperature. 相似文献
18.
P. V. Slitikov V. A. Bogoyavlenskii E. N. Rasadkina E. E. Nifant’ev 《Russian Journal of General Chemistry》2007,77(6):1028-1033
Phosphorylation of 1,4-bis(hydroxymethyl)benzene with complete phosphorous acid amides and phenyl phosphorodichloridite is studied. Some phosphorus-containing linear systems, the phosphamacrocycle precursors, are synthesized. The possibility of synthesis of phosphamacrocyclic systems based on 1,4-bis(hydroxymethyl)benzene is considered; it was shown that this compound does not tend to form macrocycles. 相似文献
19.
Polyansky DE Danilov EO Voskresensky SV Rodgers MA Neckers DC 《The journal of physical chemistry. A》2006,110(15):4969-4978
The photodecomposition dynamics of 1,4-bis(2-[4-tert-butylperoxycarbonylphenyl]ethynyl)benzene (1) have been compared with those of model compounds in the picosecond and nanosecond time domains by various photophysical techniques. Ultrafast visible transient absorption spectrometry revealed the singlet excited state of 1,4-bis(4-phenylethynyl)benzene (BPB) depopulates radiatively with a rate of 1.75 x 10(9) s(-1) and 95% efficiency. Phenyl ester moieties attached to the BPB core accelerate intersystem crossing (k = 2.8 x 10(8) s(-1)) and reduce the fluorescence quantum yield (phi(FL) = 0.82). The peroxide oxygen-oxygen bond of 1 cleaves (k = 3.6 x 10(11) s(-1)) directly from the singlet excited state (60% efficiency) causing a highly reduced fluorescence yield and leading to formation of aroyloxyl radicals. The next reaction step involves decarboxylation of the aroyloxyl radicals. Transient absorption signals in the MID IR region correspond to CO2 with the formation rate (2.5 x 10(6) s(-1)) as measured by nanosecond transient IR experiments. The transient IR spectra of the excited state of BPB, as well as of the aroyloxyl radical, evidenced a red shift in the acetylene triple bond absorption indicative of a decrease in the bond order. This clearly shows that delocalization of excitation energy over the BPB chromophore induces significant structural changes. The proposed mechanism is based on the rates of photophysical and photochemical channels and involves an additional population channel of the BPB triplet excited state from the upper singlet states. 相似文献
20.
The reactions of the polydentate ligand 1,4-bis(4,5-dihydro-2-oxazolyl)benzene (L) with AgX (X = CH3COO−, ClO4− and CF3SO3−) afforded the complexes [Ag2(L)(CH3COO)2]∞ (1), [Ag2(L)3(ClO4)2]∞ (2), and [Ag(L)(CF3SO3)]∞ (3), whereas the reaction of L with Ag2SO4 in MeOH/H2O system afforded {[Ag2(L)3(H2O)3][SO4] · 9H2O}∞ (4). The EA and IR have been recorded and all the complexes have been structurally characterized by X-ray crystallography, confirming that complexes 1–4 are two-dimensional coordination polymeric frameworks. The bidentate L ligands in complexes 3 and 4 adopt both the syn and anti conformation and those in 1 and 2 adopt the anti conformation only. The anions CH3CO2− in complex 1 bridge the Ag(I) atoms in η1, η2, μ3-coordination mode forming a 1-D zig-zag –[Ag(CH3COO)]n– chains, while the anions ClO4−, CF3SO3− and SO42− in complexes 2–4 are not coordinated to the Ag(I) atoms, but all of them play an important roles in linking cationic 2-D frameworks into 3-D supramolecular structures. 相似文献