共查询到20条相似文献,搜索用时 46 毫秒
1.
L. B. Dzaraeva V. Kh. Sabanov R. D. Dzhatieva A. F. Abaeva 《Russian Journal of General Chemistry》2013,83(8):1526-1528
Redoxites poly(2,6-diphenyl-4-vinylpyran), poly(2,6-diphenyl-4-vinylpyrylium perchlorate), poly-(2,6-diphenyl-4-vinylpyridine) and poly(2,2′,6,6′-tetraphenyl-γ,γ′-dipyridine) were obtained based on pyrylium salts. Poly(2,2′,6,6′-tetraphenyl-γ,γ′-dipyridine) was transformed into the polyene to improve its film-forming and conducting properties. Electrochemical properties of polyviologen and conductive properties of the obtained polymers were studied. 相似文献
2.
Dwain M. White 《Journal of polymer science. Part A, Polymer chemistry》1971,9(3):663-675
Poly(2,6-diphenyl-1,4-phenylene ether) reacts with phenols in the presence of an initiator to form a mixture of low molecular weight hydroxyarylene ethers. Although the reaction is similar to the equilibration of poly(2,6-dimethyl-1,4-phenylene ether) with phenols, higher reaction temperatures and larger initiator concentrations are required. Compounds as 3,3′,5,5′-tetraphenyl-4,4′-diphenoquinone, tert-butyl perbenzoate, and benzoyl peroxide are active initiators. The structure of the polymer affects the extent to which the polymer equilibrates. 相似文献
3.
The phosphonium salt from tributylphosphine and 2,6-di(4-methoxyphenyl)pyrylium perchlorate (3) reacted with diisopropylethylamine in acetonitrile to give 2,2′,6,6′-tetra(4-methoxyphenyl)-Δ4.4′-bi-4H-pyran in quantitative yield. The reaction of 3 and other 4H-pyrylium salts with tertiary amines gave 4H-pyrans. 相似文献
4.
Shigekazu Yamazaki 《合成通讯》2013,43(17):2210-2218
4,4′-Dicarboxy-2,2′-bipyridine was synthesized quantitatively by chromium(VI) oxide-mediated oxidation of 4,4′-dimethyl-2,2′-bipyridine or 4,4′-diethyl-2,2′-bipyridine with periodic acid as the terminal oxidant in sulfuric acid. 5,5′-Dicarboxy-2,2′-bipyridine and 6,6’-dicarboxy-2,2′-bipyridine were also synthesized by the method from the corresponding dimethyl bipyridines in excellent yields. 4,4′,4″-Tricarboxy-2,2′:6′,2″-terpyridine was obtained in 80% yield from 4,4′,4″-triethyl-2,2′:6′,2″-terpyridine, and 4,4′,4″,4′″-tetracarboxy-2,2′:6′,2″:6″,2′″-quaterpyridine was obtained in 72% yield from 4,4′,4″,4′″-tetraethyl-2,2′:6′,2″:6″,2′″-quaterpyridine by the same procedure. 相似文献
5.
Cédric KleinEtienne Baranoff Michael GrätzelMd. Khaja Nazeeruddin 《Tetrahedron letters》2011,52(5):584-587
Citrazinic acid is used as a convenient starting material for both tridentate 2,6-di(pyrazol-1-yl)-pyridine and tetradentate 6,6′-di(pyrazol-1-yl)-2,2′-bipyridine ligands containing carboxylic groups useful for further anchoring of sensitizer on TiO2 for dye-sensitized solar cells (DSCs). Using 2,6-dichloro-4-carboxypyridine, the synthesis of the terdentate ligands was improved compared to previously used 2,6-dibromo-4-carboxypyridine or 2,6-dichloro-4-ethylcarboxylate pyridine. Controlling the reaction conditions, it is possible to efficiently obtain the monosubstituted 2-chloro-6-pyrazol-1-yl-4-carboxypyridine, a key intermediate for the preparation of tetradentate 6,6′-di(pyrazol-1-yl)-4,4′-dicarboxy-2,2′-bipyridine ligand. 相似文献
6.
S. Petruso S. Caronna S. Gambino G. Filardo G. Silvestri 《Journal of heterocyclic chemistry》1991,28(3):793-796
The electrochemical oxidation of 2,5-diphenyl-3-acetylpyrrole (I) is described. The cyclic derivative 1,6a-dihydro-2,5,6a-triphenyl-3,4-diacetylbenzo[g]pyrrolo[3,2-e]indole (II) was obtained in very good yield. However, when water was present in the reaction medium, a different derivative, 4-acetyl-2-hydroxy-2,5-diphenyl-3-(4′-acetyl-2′,5′-diphenyl-3′-yl)-2H-pyrrole (III) , was obtained as the main product. 2,2′,5,5′-Tetraphenyl-4,4′-diacetyl-3,3′-dipyrryl (IV) , a potentially useful intermediate for the synthesis of condensed pyrroles, was synthesized by zinc reduction of III. 相似文献
7.
Yuchen Du Prof. Dr. Alex McSkimming Prof. Dr. Joel T. Mague Prof. Dr. Robert A. Pascal Jr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(41):e202200931
Tetradecaphenyl-p-terphenyl ( 2 ) was synthesized from 2,3,5,6-tetraphenyl-1,4-diiodobenzene ( 11 ) by two methods. Ullmann coupling of 11 with pentaphenyliodobenzene ( 9 ) gave compound 2 in 1.7 % yield, and Sonogashira coupling of 11 with phenylacetylene, followed by a double Diels-Alder reaction of the product diyne 12 with tetracyclone ( 6 ), gave 2 in 1.5 % overall yield. The latter reaction also gave the monoaddition product 4-(phenylethynyl)-2,2′,3,3′,4′,5,5′,6,6′-nonaphenylbiphenyl ( 13 ) in 4 % overall yield. The X-ray structures of compounds 2 and 13 show them to possess core aromatic rings distorted into shallow boat conformations. Density functional calculations indicate that these unusual structures are not the lowest energy conformations in the gas phase and may be the result of packing forces in the crystal. In addition, while uncorrected DFT calculations indicate that the strain energy in compound 2 is approximately 50 kcal/mol, dispersion-corrected DFT calculations suggest that it is essentially unstrained, due to compensating, favorable, intramolecular interactions of its many phenyl rings. An attempted synthesis of tetradecaphenyl-o-terphenyl ( 4 ) by reaction of diphenylhexatriyne ( 14 ) with three equivalents of tetracyclone at 350 °C gave only the diadduct 2-(phenylethynyl)-2′,3,3′,4,4′,5,5′,6,6′-nonaphenylbiphenyl ( 15 ) in 17 % yield. Even higher temperatures failed to produce 4 and lowered the yield of 15 , perhaps due to rapid decomposition of the starting materials. Ullmann coupling of 3,4,5,6-tetraphenyl-1,2-diiodobenzene ( 16 ) and compound 9 also failed to give compound 4 . 相似文献
8.
Unprecedented Strong Lewis Bases—Synthesis and Methyl Cation Affinities of Dimethylamino‐Substituted Terpyridines 下载免费PDF全文
Dr. Paul Hommes Christina Fischer Dr. Christoph Lindner Prof. Dr. Hendrik Zipse Prof. Dr. Hans‐Ulrich Reissig 《Angewandte Chemie (International ed. in English)》2014,53(29):7647-7651
A versatile method for the synthesis of functionalized 2,2′:6′,2′′‐terpyridines by assembly of the terminal pyridine rings is presented. The cyclization precursors—bis‐β‐ketoenamides—are prepared from 4‐substituted 2,6‐pyridinedicarboxylic acids and acetylacetone or its corresponding enamino ketone. Treatment with trimethylsilyl trifluoromethanesulfonate induces a twofold intramolecular condensation providing an efficient access to 4,4′′‐di‐ and 4,4′,4′′‐trifunctionalized 6,6′′‐dimethyl‐2,2′:6′,2′′‐terpyridines. Using this method, hitherto unknown 4,4′′‐bis(dimethylamino)‐ and 4,4′,4′′‐tris(dimethylamino)terpyridines have been prepared that show remarkably high calculated Lewis basicities. 相似文献
9.
Raymond N. Castle William D. Guither Peter Hilbert Fritz E. Kempter Natu R. Patel 《Journal of heterocyclic chemistry》1969,6(4):533-538
2,7-Dimethyl-4,5,9,10-tetraazapyrene (VI) was synthesized by the catalytic hydrogenation of 4,4′-dimethyl-2,2′,6,6′-tetranitrobiphenyl (IIa) with W-2 Raney nickel in the presence of alkali. 4,4′-Dicarbomethoxy-2,2′,6,6′-tetranitrobiphenyl (IIc) under similar conditions in neutral medium gave 4,4′-dicarbomethoxy-2,2′,6,6′-tetraaminobiphenyl (IV) which on oxidation gave 2,7-dicarbomethoxy-4,5,9,10-tetraazapyrene (V). 2,7-Dimethyl-, 2,7-dimethoxy-, and 2,7-diacetamido-4,5,9,10-tetraazapyrene di-N-oxides (III a,b,c) were obtained by catalytic reduction of the corresponding 4,4′-disubstituted-2,2′,6,6′-tetranitrobiphenyls with W-7 Raney nickel in the presence of alkali. Compound VI on oxidation with hydrogen peroxide gave the di-N-oxide (IIIa). 相似文献
10.
Brendan Twamley Ned J. Hardman Philip P. Power 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(11):e514-e515
The sterically encumbered terphenyl halides 2′‐chloro‐2,2′′,4,4′′,6,6′′‐hexaisopropyl‐1,1′:3′,1′′‐terphenyl, C36H49Cl, (I), 2′‐bromo‐2,2′′,4,4′′,6,6′′‐hexaisopropyl‐1,1′:3′,1′′‐terphenyl, C36H49Br, (II), and 2′‐iodo‐2,2′′,4,4′′,6,6′′‐hexaisopropyl‐1,1′:3′,1′′‐terphenyl, C36H49I, (III), crystallize in space group Pnma. They are isomorphous and isostructural with a plane of symmetry through the centre of the molecule. The C–halide bond distances are 1.745 (3), 1.910 (4) and 2.102 (6) Å for (I)–(III), respectively. 相似文献
11.
4-Phenyl-2,6-dimethylaniline has been prepared in a variety of ways. Oxidation by the peroxidase system gives 4,4′-diphenyl-2,6,2′,6′-tetramethylazobenzene and p-benzoquinone-4-(4′-phenyl-2′,6′-dimethylanil. A mechanism is proposed for this unusual reaction. 相似文献
12.
The electronic structure of 4-H-pyran-4-one and its sulfur analogues were studied using ab initio wave-functions. Bond lengths and overlap populations suggest low aromaticity for this group of compounds. Examination of Jorgensen plots of the lowest π orbitals of I--IV leads to the aromaticity order 4H-thiopyran-4-thione (IV) > 4H-thiopyran-4-one (II) > 4H-pyran-4-thione (III) > 4H-pyran-4-one (I). The effects of including d orbitals were studied using the 3-21G, 3-21G* (6d), and 3-21G* (5d) basis sets. Optimized bond lengths, vibrational frequencies, ionization energies, and dipole moments were also obtained, and results for different basis sets were compared. 相似文献
13.
A range of 6,6″-disubstituted derivatives of 2,2′: 6,2″-terpyridine have been prepared with the intention of forming macrocycles incorporating the 2,2′: 6′,2terpyridyl moiety. A high yield route to 6,6″-bis(methylhydrazino-4′-phenyl-2,2′:6′,2″-terpyridine is described, and a number of complexes of this novel pentadentate ligand have been prepared. 相似文献
14.
The naturally occurring polybrominated indoles 2,2′,5,5′-tetrabromo-3,3′-bi-1H-indole, 2,2′,6,6′-tetrabromo-3,3′-bi-1H-indole, and 2,2′,5,5′,6,6′-hexabromo-3,3′-bi-1H-indole were synthesized using a palladium catalyzed, carbon monoxide mediated, double reductive N-heterocyclization of 2,3-bis(2-nitro-4(or 5)-bromophenyl)-1,4-butadienes as the key step. 相似文献
15.
Jadson L. Oliveira Maria J. Silva Tupolevck Florêncio Karène Urgin Stéphane Sengmany Eric Léonel Jean-Yves Nédélec Marcelo Navarro 《Tetrahedron》2012,68(10):2383-2390
One step nickel-catalyzed electroreductive homocoupling among 2-bromopicolines and 2-bromopyridine has been investigated by our group in an undivided cell and using zinc or iron as sacrificial anode. In this work, it was developed mono and dihalopyridines coupling to obtain possible products from heterocoupling. A series of reactions were carried out in order to develop a synthetic method for the preparation of unsymmetrical 2,2′-bipyridines and 2,2′:6′,2″-terpyridines. Statistical yields (50%) were observed for 2-bromopyridines/2-bromo-6-methylpyridine heterocoupling. In a preliminary study devoted to terpyridines preparation, good results were obtained for 2,6-dihalopyridines homocoupling, affording 2,6-dichloro-2,2′-bipyridine (46%) and 2,6-dibromo-2,2′-bipyridine (56%), at controlled reaction time. At major reaction time, it was observed that the direct electroreduction of the 2,6′-dihalo-2,2′-bipyridines intermediates and 2,6″-dihalo-2,2′:6′,2″-terpyridines products on the cathode surface. A reasonable isolated product yield of 6,6″-dimethyl-2,2′:6′,2″-terpyridine (10%) was only observed in the reaction between 2,6-dichloropyridine and 2-bromo-6-methylpyridine (1:2). 相似文献
16.
Yousuke Konno Hiroto Kudo Atsushi Kameyama Tadatomi Nishikubo 《Journal of polymer science. Part A, Polymer chemistry》2004,42(10):2543-2550
Fluorine‐containing polyethers with pendant hydroxyl groups were synthesized by the polyaddition of fluorine‐containing bis(epoxide)s with certain fluorine‐containing diols with quaternary onium salts as catalysts. When the polyaddition was performed with 2,2′,6,6′‐tetrafluoro‐4,4′‐biphenol diglycidiyl ether and 2,2′,6,6′‐tetrafluoro‐4,4′‐biphenol, the corresponding polyether with pendant hydroxyl groups was successfully obtained in good yield. The polyaddition of certain fluorine‐containing bis(epoxide)s with diols also proceeded in bulk to provide the corresponding fluorine‐containing polyethers with high molecular weights. These polyethers were highly transparent at 157 nm for 0.1 μm thickness, with their transmittance of 14–75% at 157 nm. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2543–2550, 2004 相似文献
17.
N. A. Dudina E. V. Antina A. Yu. Nikonova M. B. Berezin G. B. Guseva A. I. V’yugin 《Russian Journal of General Chemistry》2013,83(10):1941-1943
The homoleptic complexes of Zn(II) with 3,3′,5,5‘-tetraphenyl-2,2’-dipyrrolylmethene and 3,3′,5,5′-tetraphenyl-ms-aza-2,2′-dipyrrolylmethene [ZnL2] have been prepared, and their spectral and luminescent properties have been studied. The complex with 3,3′,5,5′-tetraphenyl-2,2′-dipyrrolylmethene exhibited an intense fluorescence in the nonpolar medium, efficiently quenched in the polar solvents; thus, it can be used as a fluorescent sensor of the medium polarity. 相似文献
18.
Clifford Owens Louis L. Pytlewski Kenneth Krevitz Thomas Mitchell 《Thermochimica Acta》1982,54(3):281-287
Thermal decomposition of sym-dichlorobis (2,4,6-trichlorophenyl) urea occurs by two steps: the first at 150–184°C accompanied by a 26% weight loss and +(16.6±0.7) kcal mole?1 and the second by a 40% weight loss and ?(17.4±1.0) kcal mole?1. The decomposition pressure follows the equation ln p=A + B/T + C/T2 where A = 149.89, B=9.45·10 [4] and C=1.48·10 [7]. The decomposition products are 2,4,6-trichlorophenyl isocyanate 2,4,6-trichloroaniline, chlorine, 1,2,3,5-tetrachlorobenzene, 2,2′,4,4′,6,6′-hexachlorobiphenyl, 2,2′,4,4′-tetrachlorobiphenyl, 2,2′,4,4′,6-pentachlorobiphenyl and ammonium chloride. 相似文献
19.
The 4,4′,6,6′-tetrasubstituted 2,2′-alkylidenebis(phenols) 1 reacted with CISCOI to give spiro[1,3-benzoxathiepin-4(5H), 1′-cyclohexa[2,4]diene]-2,2′-diones 4 , together with cyclic carbonates 5 . The structures of the products were elucidated mainly by 13C-NMR and 1H-NMR spectroscopy. 相似文献
20.
Elena Bermejo Alfonso Castieiras Douglas X. West 《Journal of Molecular Structure》2003,650(1-3):93-97
Condensation of thiosemicarbazide or N(4)-ethylthiosemicarbazide with 1,2,8,9-tetraphenyl-3,7-diazanona-1,9-dione in the presence of copper(II) acetate in 96% ethanol leads to Δ6-5,6-diphenyl-5-methoxy-1,2,4-triazacyclohexene-3-thione, C16H15N3OS, or Δ6-4-methyl-5,6-diphenyl-5-ethoxy-1,2,4-triazacyclohexene-3-thione, C18H19N3OS. For C16H15N3OS the crystal data are monoclinic, P21/c, a=9.7780(7), b=8.5120(3), c=18.2210(13) Å, β=100.958(3)°, V=1488.89(16) Å3, and Z=4 in agreement with an earlier report. For C18H19N3OS the crystal data are orthorhombic, P212121, a=8.6940(3), b=12.9946(3), c=15.5139(5) Å, V=1752.68(9) Å3, and Z=4. 相似文献