共查询到20条相似文献,搜索用时 15 毫秒
1.
E. N. Ushakova O. V Konyushko A. A. Glazkov S. P. Krukovsky 《Russian Chemical Bulletin》1996,45(6):1501-1503
A series of 1,1-dihydroperfluorooxaalkan-1-ols and ,,,-tetrahydroperfluorooxaalkanediols has been synthesized. Some tercphthalates were synthesized by the reaction of these alcohols and diols with terephthaloyl chloride.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1573–1576, June, 1996. 相似文献
2.
The solid-phase preparation of vinyl sulfones via a novel polystyrene-supported selenomethyl phenyl sulfone reagent has been reported. 相似文献
3.
Sheng-Huei Hsiao Chin-Ping Yang Sheng-Wen Wang Ming-Hung Chuang 《Journal of polymer science. Part A, Polymer chemistry》1999,37(18):3575-3583
1,1-Bis[4-(4-carboxyphenoxy)phenyl]cyclohexane (III) and 1,1-bis[4-(4-aminophenoxy)phenyl]cyclohexane (V) were prepared in two main steps starting from the aromatic nucleophilic substitution of p-fluorobenzonitrile and p-chloronitrobenzene, respectively, with 1,1-bis(4-hydroxyphenyl)cyclohexane in the presence of potassium carbonate in N,N-dimethylformamide (DMF). Using triphenyl phosphite and pyridine as condensing agents, two series of polyamides with cyclohexylidene cardo groups were directly polycondensated from dicarboxylic acid III with various aromatic diamines or from diamine V with various aromatic dicarboxylic acids in an N-methyl-2-pyrrolidone (NMP) solution containing dissolved calcium chloride. The polyamides exhibited inherent viscosities in the range of 0.45 to 1.78 dL/g. Almost all of the polymers were readily soluble in polar aprotic solvents such as NMP and N,N-dimethylacetamide (DMAc) and could afford transparent, flexible, and tough films by solution casting. The glass transition temperatures (Tg) of these aromatic polyamides were in the range of 180–243°C by DSC, and the 10% weight loss temperatures in nitrogen and air were all above 450°C. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3575–3583, 1999 相似文献
4.
Crown ether-type macrocycles consisting of an enantiopure biarenol derivative and an oligoethylene glycol were synthesized by the Lewis acid-mediated tandem Claisen rearrangement. This is the first example of the successful application of the tandem Claisen rearrangement to the synthesis of enantiopure macrocyclic biarenol derivatives. The enantiopure macrocyclic biarenols were found to form 1:1 complexes with amino acid salts and to discriminate their chirality. 相似文献
5.
1,1-二氨基-2,2-二硝基乙烯的合成研究进展 总被引:1,自引:0,他引:1
1,1-二氨基-2,2-二硝基乙烯(FOX-7)是一种低感度高能量的新型含能材料.现有的1,1-二氨基-2,2-二硝基乙烯的合成包括以2-甲基咪唑、盐酸乙脒与乙二酸二乙酯、2-甲基-4,6-二羟基嘧啶为前体的三条合成路线.使用硫酸/硝酸体系硝化2-甲基-4,6-二羟基嘧啶可得到2-二硝基亚甲基-5,5-二硝基嘧啶-4,6-二酮,然后水解可得到FOX-7,正相硅胶薄层色谱可对该反应进行监测.使用曲拉通X-100/正己烷体系的反相微乳法可制备FOX-7球形纳米晶;FOX-7球形纳米晶具有良好的应用前景,对其合成工艺与路线进行探索和研究具有一定的意义. 相似文献
6.
7.
A novel method for the synthesis of thiophene 1,1-dioxides by oxidation of substituted thiophenes with trifluoroperoxyacetic acid was developed. The effect of the solvent nature on the course of the reaction was studied and optimum conditions for the oxidation of thiophenes containing various functional groups were found. Previously unknown thiophene dioxides were obtained.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2144–2150, October, 2004. 相似文献
8.
Christopher Imrie Phumelele Kleyi Thomas I.A. Gerber Jennifer Look 《Journal of organometallic chemistry》2007,692(16):3443-3453
Grinding of 1,1′-ferrocenedicarboxaldehyde with a 2.2 molar equivalent of an aromatic amine in a solvent-free environment provided excellent yields of 1,1′-ferrocenyldiimines. After mixing the aldehyde and amines, a gum or melt formed which eventually solidified to the product. An analytically pure sample of the product was obtained by cold recrystallization. Grinding of ferrocenecarboxaldehyde and 4-substituted phenylacetonitriles under solvent-free conditions provided good yields of the corresponding ferrocenylacrylonitriles. The yield in this reaction was very low when the substituent group para to the acetonitrile group was electron-donating. 相似文献
9.
Artem Cherepakha Vladimir O. Kovtunenko Andrey Tolmachev Konstantin G. Nazarenko 《合成通讯》2013,43(13):1977-1989
A short and efficient synthesis of the title compound based on racemate resolution is described. 相似文献
10.
Using Bader’s quantum-topological theory of atoms in molecules (AIM) and Weinhold’s Natural Bond Orbital (NBO) analysis we
could rationalize the impact of the geminal substitution by C≡N and Cl on the geometry and electronic structure of the cyclopentane
ring in 1,1-dicyanocyclopentane (DCCP) and 1,1-dichlorocyclopentane (DClCP). Among the crucial results we obtained are: 1.
The topological quantities, particularly the bond ellipticity of 0.035 for the C–CN bond, indicate that this bond possesses
higher bond order than a single bond. This conclusion is clearly supported by the NBO results. 2. The AIM theory as well as
the NBO analysis confirm uniformly the non-linearity of the C–C≡N moiety. 3. Regardless the quantum mechanical method that
has been employed for a variety of nitriles the sign of the Laplacian of the charge density, ∇2ρ(r), of the C≡N group changes its sign from negative to positive upon moving from the triple zeta to the double zeta basis
set. A possible explanation for this striking behavior has been provided. By invoking the AIM and NBO approaches the different
endocyclic C–C bond lengths in DCCP and DClCP as a consequence of the geminal substitution could be explained. Also the variations
of these bond lengths upon moving from the more stable C
s
to the energetically less favorable C
2
conformer of both compounds could be rationalized. For the purpose of comparison and verification of some findings of this
work, we also carried out AIM and NBO calculations on various related cyclic and non-cyclic compounds. 相似文献
11.
Magnesium Azotetrazole‐1,1′‐dioxide: Synthesis and Promising Properties of Green Insensitive Energetic Materials 下载免费PDF全文
Magnesium azotetrazole‐1,1′‐dioxide ( 1 ) was first prepared and intensively characterized by single‐crystal X‐ray diffraction, IR spectroscopy, mass spectrometry, elemental analysis, and DSC measurements. The heat of formation was calculated using the atomization energy method based on quantum chemistry and the heat of detonation was also predicted. The NBO analysis was performed for inspecting charge distributions. The sensitivities towards impact and friction were tested using the BAM standard. The high detonation performance (5289 kJ · kg–1), good thermal stabilities (245.5 °C) and excellent insensitivity (39.2 J and >360 N) as well as clean decomposition products supports it of great interest as a promising candidate of green insensitive energetic materials. 相似文献
12.
Henryk Foks Danuta Pancechowska-Ksepko Mieczysław Janowiec Zofia Zwolska Ewa Augustynowicz-Kopeé 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2291-2297
1,1-bis-methylthio-2-nitro-ethene was used as a substrate to the syntheses of new heterocyclic compounds. In the reactions, with 1-phenylpiperazine—the corresponding diaminonitroethane 1 , 1,3-diaminonitropropane, and 1,3-diaminonitropropanol—the nitromethylenotetrahydropyrimidine derivatives 2 and 3 were prepared, whereas, with o-phenylenediamine—2-nitromethyleno-benzimidazole 4 were obtained. In the condensation reactions of compounds 2 , 3 , and 4 with benzoyl isothiocyanate, the products 5 , 6 , and 7 were obtained, and afterwards two of them, 5 and 6 , were transformed into the isothiazolines 8 and 9 . 1,1-bis-(4-phenylpiperazino)-2-nitroethane ( 1 ) was exposed to the action of phenyl isothiocyanate and the derivative obtained ( 10 ) was transformed, in the reaction with phenacylbromide, in to benzoylonitrothiophene 11 . The diazo compounds 12 , 13 , and 14 were obtained in the reactions of nitromethylenotetrahydropyrimidines 2 and 3 and of 2-nitromethylenobenzimidazole 4 with benzenediazonium chloride. The derivatives obtained were tested in vitro for their tuberculostatic activity. The compounds 7 (MIC 8–32 μg/mL) and 14 (MIC 16–63 μg/mL) appeared to be the most active compounds. 相似文献
13.
Synthesis of Dibutadienyl Piperazines, 1,1-Dithio and 1,4-Dithio Substituted Dienes from Nitrodienes
Cemil İbiş Gökşin Aydınlı 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2529-2535
Nitrodiene 1a , 1b reacted with 1,4-dithiolbutan and gave the heterocyclic compounds 3a , 3b . 1b gave with 1,3-acetonedithiol the compound 5b . The nitrodiene compound 1b reacted with o-dithiolbenzene ( 6 ) and yielded the ketene dithioacetal ( 7b ). Heterocyclic compounds 11a , 11b , 12a , and 12b were prepared from the reactions of 9a with 2,2'-oxydiethanethiol. The compounds 9a , 9b were prepared from 2-nitropentachloro-1,3-butadiene and alkylthiols ( 8a , 8b ). Mono(thio) substituted diene compound 9b gave dibutadienyl piperazine 14b with piperazine in diethylether. 相似文献
14.
Thirty laterally fluorosubstituted new 4-isothiocyanato-, 4-cyano-, 4-fluoro- and 4-(1,1,1-trifluorometoxy)-4′-(4-alkylphenyl)tolanes have been synthesised and their phase transition temperatures and enthalpies and electric permittivity have been measured. These data have been analysed together with data for earlier prepared similar compounds and with recently prepared analogously substituted 4″-alkyl-terphenyls. It was shown that some di-, tri- and tetra-fluorosubstituted 4-isothiocyanato- and 4-cyano-4′-(4-alkylphenyltolanes) are very useful components for the formulation of high birefringence (Δn up to 0.5 measured at 589 nm) and large temperature range nematic mixtures for photonic applications, especially in the infra-red, GHz and THz range of electromagnetic radiation. Three ways of formulation of high birefringence mixtures were proposed. 相似文献
15.
Chunping Gao Allan S. Hay 《Journal of polymer science. Part A, Polymer chemistry》1995,33(14):2347-2352
Poly (aryl ether)s containing the diphenylethylene moiety, synthesized from 1,1-bis(4-fluo-rophenyl)ethylene or 1,1-bis(4-hydroxyphenyl)ethylene, are thermally crosslinkable. Char-acterization and crosslinking studies of these polymers were carried out by GPC, DSC, TGA, and NMR. The solvent resistance and Tg's of the resulting crosslinked networks increase after crosslinking. Thermogravimetric analysis shows that no significant mass loss accompanies the crosslinking reaction. © 1995 John Wiley & Sons, Inc. 相似文献
16.
Fang-Hui Wu Taike Duan Qian-Feng Zhang Wa-Hung Leung 《Journal of organometallic chemistry》2009,694(24):3844-153
Reactions of [Ru(PPh3)3Cl2] with ROCS2K in THF at room temperature and at reflux gave the kinetic products trans-[Ru(PPh3)2(S2COR)2] (R = nPr 1, iPr 2) and the thermodynamic products cis-[Ru(PPh3)2(S2COR)2] (R = nPr 3, iPr 4), respectively. Treatment of [RuHCl(CO)(PPh3)3] with ROCS2K in THF afforded [RuH(CO)-(S2COR)(PPh3)2] (R = nPr 5, iPr 6) as the sole isolable products. Reaction of [RuCl2(PPh3)3] with tetramethylthiuram disulfide [Me2NCS2]2 gave a Ru(III) dithiocarbamate complex, [Ru(PPh3)2(S2CNMe2)Cl2] (7). This reaction involved oxidation of ruthenium(II) to ruthenium(III) by the disulfide group in [Me2NCS2]2. Treatment of 7 with 1 equiv. of [M(MeCN)4][ClO4] (M = Cu, Ag) gave the stable cationic ruthenium(III)-alkyl complexes [Ru{C(NMe2)QC(NMe2)S}(S2CNMe2)(PPh3)2][ClO4] (Q = O 8, S 9) with ruthenium-carbon bonds. The crystal structures of complexes 1, 2, 4·CH2Cl2, 6, 7·2CH2Cl2, 8, and 9·2CH2Cl2 have been determined by single-crystal X-ray diffraction. The ruthenium atom in each of the above complexes adopts a pseudo-octahedral geometry in an electron-rich sulfur coordination environment. The 1,1′-dithiolate ligands bind to ruthenium with bite S-Ru-S angles in the range of 70.14(4)-71.62(4)°. In 4·CH2Cl2, the P-Ru-P angle for the mutually cis PPh3 ligands is 103.13(3)°, the P-Ru-P angles for other complexes with mutually trans PPh3 ligands are in the range of 169.41(4)-180.00(6)°. The alkylcarbamate [C(NMe2)QC(NMe2)S]− (Q = O, S) ligands in 8 and 9 are planar and bind to the ruthenium centers via the sulfur and carbon atoms from the CS and NC double bonds, respectively. The Ru-C bond lengths are 1.975(5) and 2.018(3) Å for 8 and 9·2CH2Cl2, respectively, which are typical for ruthenium(III)-alkyl complexes. Spectroscopic properties along with electrochemistry of all complexes are also reported in the paper. 相似文献
17.
Young-Seok Oh Hye-Jin Lee Minji Yoo Hyoung-Juhn Kim Jonghee Han Tae-Hyun Kim 《Journal of membrane science》2008
Novel crosslinked sulfonated poly(ether sulfone)s (PESs) were prepared by thermal irradiation of the allyl-terminated telechelic sulfone polymers using a bisazide. The sulfonated polymers in different comonomer compositions were fully characterized by 1H NMR, and the crosslinked structure was also verified by FT-IR spectroscopic analyses. Having both the uniform distribution of the hydrophilic conductive sites and controlled hydrophobic nature by minimized crosslinking over the rigid rod poly(ether sulfone) backbone, the crosslinked polymer membrane (PES-60) offered excellent proton conductivity of 0.79 S cm−1 at 100 °C together with hydrolytic and oxidative stability. In addition, only 17% of methanol permeability of the Nafion® was observed for the crosslinked PES-60. 相似文献
18.
An efficient approach was developed for the synthesis of 4,5-dihydroisoxazole derivatives from substituted 1,1-dicyano-cyclopropanes and hydroxylamine hydrochloride in ethanol through FeCl3-catalyzed cascade addition reactions. This procedure gives a useful method to afford stereoselectively poly-substituted 4,5-dihydroisoxazoles in good yields. 相似文献
19.
M. Vorona G. Veinberg I. Shestakova I. Kanepe M. Petrova E. Liepinsh E. Lukevics 《Chemistry of Heterocyclic Compounds》2007,43(12):1567-1576
7α-Chloro-3-methyl-1,1-dioxoceph-3-ems with amide or keto group at position 4 have been synthesized by structural modification
of 7α-chloro-3-methyl-1,1-dioxoceph-3-em-4-carboxylic acid. Screening of these compounds for cytotoxic activity revealed compounds
with specific activity against cancer cells in vitro, capable of effective inhibition of the growth of sarcoma S-180 in vivo.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, 1849–1859, December 2007. 相似文献
20.
Moon Suk Kim Fumio Sanda Takeshi Endo 《Journal of polymer science. Part A, Polymer chemistry》2001,39(19):3365-3370
A novel phosphate monomer, O‐p‐(methacryloyloxymethyl)benzyl O,O‐diethyl phosphate (MDP) was synthesized by the reaction of diethyl phosphorochloridate with 1,4‐benzenedimethanol, followed by the reaction with methacryloyl chloride in the presence of triethylamine. The radical polymerization of MDP and copolymerization with methyl methacrylate were carried out in the presence of 2,2′‐azobisisobutyronitrile (3 mol %) in dimethylacetamide at 60 °C for 20 h to afford phosphate‐pendant polymers. The polymerization of glycidyl phenyl ether (GPE) was carried out with the phosphate‐pendant polymer as an initiator in the presence of ZnCl2. The polymerization did not proceed below 90 °C but rapidly proceeded above 90 °C to afford polyGPE. The phosphate‐pendant polymer served as a good thermally latent polymeric initiator. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3365–3370, 2001 相似文献