共查询到20条相似文献,搜索用时 15 毫秒
1.
M. L. Keshtov A. L. Rusanov N. M. Belomoina A. K. Mikitaev G. B. Sarkisyan M. M. Begretov 《Russian Chemical Bulletin》1996,45(9):2240-2242
A series of new bis[p-(phenylethynyi)phenyl]hetarylenes was obtained by cross-coupling between heteroaromatic dibromides and phenylacetylene catalyzed by phosphine complexes of palladium in the presence of Cul and an organic base. Bis[p-(phenylethynyl)phe-nyl]hetarylenes were oxidized to the corresponding bis[p-(phenylglyoxalyl)phenylihetarylenes using the I2-DMSO system.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2359–2361, September, 1996. 相似文献
2.
Masahiko Maekawa Kunihisa Sugimoto Takashi Okubo Takayoshi Kuroda-Sowa Megumu Munakata 《Polyhedron》2010
Three novel 1D Cu(I) coordination polymers [Cu4X4(pprd)2]n (X = Cl(1), Br(2) and I(3); pprd = 4-(2-pyridyl)pyrimidine) were systematically synthesized by Cu(I) halides and the pprd ligand, and they have been characterized by X-ray, IR, and TG-DTA analyses. The molecular structure of complex 1 essentially resembles to that of complex 2. In complexes 1 and 2, four Cu(I) atoms are bridged by four Cl or Br anions to form an eight-membered Cu4X4 framework in the twist-chair form. Furthermore, the Cu4X4 frameworks are coordinated by the chelate and bridging sites of two pprd ligands to form a unique 1D two-stepped Cu(I) coordination polymer, in which two stairs are formed by the Cu4X4 core and two heteroaromatic planes of pprd. In the crystal packing structures, it is interesting that two heteroaromatic planes of pprd are stacking along the b-axis for complex 1 and the a-axis for complex 2. In contrast, four Cu(I) atoms in complex 3 are bridged by four I atoms to form a Cu4I4 stepped cubane tetramer. Additionally, the Cu4I4 stepped cubane cores are linked by the chelate and bridging sites of two pprd ligands to form an infinite 1D zigzag-chain Cu(I) coordination polymer. The thermal decomposition behaviors for Cu(I)–X/pprd complexes 1, 2 and 3 were determined by thermogravimetric analysis (TG-DTA). Although the thermal decomposition behaviors of complex 1 were unidentified, those of complexes 2 and 3 were assigned. The mass loss at the first stage of thermal decomposition for polymeric [Cu4X4(pprd)2]n was identical to the formation of oligomeric [Cu4X4(pprd)] by the elimination of one pprd molecule. The mass loss at the next stage was decided to the formation of Cu4X4 by the elimination of another pprd molecule. 相似文献
3.
RhTp(cod) ( 1 ) and RhBp(cod) ( 2 ), almost inactive in CH2Cl2, became good catalysts of phenylacetylene polymerization in ionic liquids ([bmim]Cl, [bmim]BF4: bmim = 1‐butyl‐3‐methylimidazolium, [mokt]BF4: mokt = 1‐methyl‐3‐oktylimidazolium, [bumepy]BF4: 1‐butyl‐4‐methylpyridinium) and in CH2Cl2 in the presence of tetraammonium halides ([R4N]X, R = Bu, Et; X = Cl, Br). The highest yields of polyphenylacetylene with catalyst 1 were obtained in [bmim]Cl at 65°C (64% after 2 h) and in [mokt]BF4 at 20°C (56% after 24 h). In alcohols (CH3OH, (CH3)2CHOH, (CH3)3COH) as solvents, up to 100% of the polymer was produced. When a mixture of an ionic liquid and CH3OH was used as the reaction medium, the polymer yield was similar to the yield achieved in an ionic liquid only, but the molecular weight increased remarkably. Tetraammonium salts, [R4N]X, are co‐catalysts for 1 , and the yield of the polymer increased in the order [Et4N]Br < [Bu4N]Br < [Et4N]Cl < [Bu4N]Cl. Polymers with molecular weights from 6900 to 38 800 Da were obtained with catalyst 2 in [R4N]Br or [R4N]Cl, whereas in ionic liquids ([bmim]Cl, [bmim]BF4) the corresponding molecular weights were higher, from 51 300 to 60 300 Da. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
4.
1-(4-硝基苯)-3-(3-甲基吡啶)-三氮烯合成及其与铜的显色反应 总被引:1,自引:0,他引:1
报道了新显色剂 1-(4-硝基苯)-3-(3-甲基吡啶)-三氮烯(NPMPDT)的合成及其与铜的显色反应.在OP的存在下,pH 10.5的Na2B4O7-NaOH缓冲溶液中,该试剂能与铜发生显色反应,铜与NPMPDT形成摩尔比为2∶1型的黄色配合物,在460 nm处有一最大正吸收,在535 nm 处有一最大负吸收.以460 nm为参比波长,535 nm为测量波长进行双波长测定,其表观摩尔吸光系数ε=2.18×105 L·mol-1·cm-1,铜的质量浓度在0~0.48 μg/mL 范围内符合比尔定律,用本法测定大米和面粉中微量的铜,结果满意. 相似文献
5.
Wen-Shu Hwang Chung-Jeh Hwang Dong-Liang Wang Liang-Shiu Lee Michael Y. Chiang 《中国化学会会志》1998,45(4):555-561
N,N′-1,2-phenylenebis(2-thienylideneimine) (PTI) can be obtained via the condensation of o-phenylenediamine and thiophene-2-carboxaldhyde in cyclohexane. It isomerized to its cyclic form 1-(2-thienylmethyl)-2-(2-thienyl)benzimidazole (TMTBI) readily in the presence of Fe2(CO)9. Coordination reactions of PTI with cuprous iodide and silver nitrate in acetonitrile resulted in the formation of [Cu(TMTBI)I]2 and [Ag(TMTBI)2]NO3, respectively, in which the PTI ligand had been isomerized to TMTBI. Both PTI, TMTBI, and complexes were characterized by NMR, IR, and Mass spectroscopies as well as elemental analysis. The crystal structures of TMTBI and [Cu(TMTBI)I]2 were determined by single-crystal X-ray diffraction. Crystallographic details for X-ray structures are as follows. TMTBI is crystallized in the monoclinic space group P21/n with a = 8.953(3), b = 9.150(1), c = 17.436(2) Å, β = 93.73(2)°, and Z = 4. The final R factor was 0.050 (Rw = 0.066) for 1337 observed reflections. Complex [Cu(TMTBI)I]2 is crystallized in the triclinic space group $ {\rm P}\bar 1 $ with a = 9.961 (2), b = 10.825(2), c = 9.184(2) Å, α = 112.98(2), β = 110.78(2), γ = 88.71 (2)°, and Z = 2. The final R factor was 0.056 (Rw = 0.057) for 2363 observed reflections. 相似文献
6.
7.
S. E. Semenov A. M. Churakov L. F. Chertanova Yu. A. Strelenko S. L. Ioffe V. A. Tartakovskii 《Russian Chemical Bulletin》1992,41(2):277-279
By reaction of 4-amino-1,2,4-triazole with 1-nitroso-2,4,6-trichlorobenzene in the presence of excess dibromoisocyanurate the title compound was obtained.N. D. Zelinskii Institute of Organic Chemistry, Russian Academy of Sciences, 117913 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 2, pp. 362–364, February, 1992. 相似文献
8.
Unlike 1-aminobenzimidazoles, 1-alkylaminobenzimidazoles are thiolated on fusing with sulfur without elimination of theN-amino group, yielding the previously unknown 1-(alkylamino)benzimidazoline-2-thiones. These compounds can be more conveniently obtained on a preparative scale by thiolation of 1-alkylacetamidobenzimidazoles with subsequent hydrolytic elimination of the acetyl group. When 1-(dialkylamino)benzimidazoles are fused with sulfur, they are converted into 1-(dialkylamino)benzimidazoline-2-thiones. By alkylation of 1-(methylamino)- and 1-(diethylamino)benzimidazoline-2-thiones with methyl iodide in alkaline media the corresponding 2-(methylthio)benzimidazoles were prepared.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2231–2235, November, 1995.The authors are grateful to the Contest Center of Basic Natural Science at St. Petersburg University for financial support of this study. 相似文献
9.
1-(4-硝基苯基)-3-(2-吡嗪)-三氮烯的合成及与镉(Ⅱ)的显色反应 总被引:1,自引:0,他引:1
报道了显色剂1-(4-硝基苯基)-3-(2-吡嗪)-三氮烯化合物的合成及其与镉(Ⅱ)的显色反应。在非离子表面活性剂Triton X-100存在下,pH 10.5的Na2B4O7-NaOH的缓冲介质中,该试剂能与镉(Ⅱ)与发生显色反应,形成摩尔比为4∶1的黄棕色配合物,配合物在波长453 nm处有最大吸收峰,表观摩尔吸光系数ε为6.90×104L.mol-1.cm-1,镉(Ⅱ)质量浓度在0~0.56μg/mL范围内遵守比尔定律。用拟定方法测不同废水中的镉(Ⅱ)。 相似文献
10.
Nalajam Guravaiah 《合成通讯》2013,43(8):1167-1174
Reaction of phenyl acetylene with 3-(1-aryl-2-mercapto-4-imidazolyl)-2H-1-benzopyran-2-ones (4) in the presence of sodium hydroxide in absolute ethanol led to the formation of 3-(1-phenyl-2-(Z-styrylthio)-1H-imidazol-4-yl)-2H-chromen-2-ones (6) in excellent yields. These, on further oxidation with H2O2/AcOH, gave the corresponding sulfones (7) with retention of stereochemistry.
11.
12.
新显色剂1-(4-硝基苯基)-3-(5-氯吡啶)三氮烯的合成及其与镉的显色反应 总被引:4,自引:0,他引:4
报道了1-(4-硝基苯基)-3-(5-氯吡啶)三氮烯(NPCPDT)的合成及其与镉的显色反应研究。在Triton X-100的存在下,pH 11.5的Na2B4O7-NaOH缓冲溶液中,该试剂能与镉发生显色反应,镉与NPCPDT形成摩尔比为1∶3的黄色配合物,在440 nm处有一最大吸收,在535 nm处有一最大负吸收。以440 nm为参比波长,535 nm为测量波长进行双波长测定,表观摩尔吸光系数为2.68×105L.mol-1.cm-1,镉的质量浓度在0~0.48μg/mL范围内符合比尔定律。用拟定方法测定废水和环境水样中的微量镉。 相似文献
13.
Roman Mazurkiewicz Agnieszka Październiok-Holewa Alicja Kononienko 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1986-1992
Efficient and convenient procedures for the α-amidoalkylation of trialkylphosphites with 1-(N-acylamino)alkyltriphenylphosphonium salts followed by a Michaelis–Arbuzov-type reaction to afford 1-(N-acylamino)alkanephosphonic acid esters have been developed. High yields and simple isolation and purification protocols are the main advantages of this method. 相似文献
14.
M. Madesclaire P. Coudert V. P. Zaitsev J. V. Zaitseva 《Chemistry of Heterocyclic Compounds》2006,42(4):506-511
A series of isomeric 2-oxazolidinones has been synthesized from (1S, 2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediol.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 579–584, April, 2006. 相似文献
15.
A series of five gold(I) halide complexes with the two isomeric methoxy-substituted triarylphosphines, tris(2-methoxyphenyl)phosphine [P(oanis)3], [AuP(oanis)3X] [for X = Cl, (1); X = Br, (2) and X = I, (3)] and tris(4-methoxyphenyl)phosphine [P(panis)3], [AuP(panis)3X] [for X = Br (4) and X = I (5)] have been synthesized and characterized by single crystal X-ray diffraction and solution 31P{1H} NMR spectroscopy. The structure determinations confirm the expected presence of linear two-coordination about the gold centres in all five complexes with bond distance and angle data typical of this type of compound [Au–P, 2.239(2)–2.259(3) Å; Au–Cl, 2.294(2) Å; Au–Br, 2.385(2)–2.402(2) Å; Au–I, 2.546(1)–2.554(1) Å; P–Au–X; 175.3(1)–180°]. All analogues except the iodo complex 5 crystallize with one complex molecule in the crystallographic asymmetric unit. The bromo and iodo complexes 2 and 3 constitute a trigonal isomorphous set while the bromo complex 4 is also isomorphous with the previously determined chloro complex [AuP(panis)3Cl]. The 2-methoxy analogues are stabilized by significant methoxy-O?Au interactions. 相似文献
16.
YU Yuna LIN Li-Rongb① HUANG Rong-Binb a 《结构化学》2006,25(10):1197-1202
1 INTRODUCTION Recently, for the fluorescent properties, Schiff base has been more and more important and widely studied in density optical memories, nonlinear op- tics (NLO), organic light-emitting diodes (OLED), polymer LED and electrogenerated chemilumines- cence (ECL)[1~5]. Thiosemicarbazones are a kind of Schiff bases with thiourea and good ligands easily chelating with transition metal ions. Although they have been studied extensively for a long time due to their chemical and b… 相似文献
17.
1—间甲氧苯基—2—二甲胺甲基环己醇的合成与结构研究 总被引:3,自引:0,他引:3
通过间溴苯甲醚与2-二甲胺甲基环己酮反应制得1-间甲氧苯基-2-二胺甲基环己醇,对其分离得到相应的顺反异构体,对反应的立体化学进行了分析,并对^13C NMR谱确定了顺反异构体的构型。 相似文献
18.
1 INTRODUCTION Phosphorus-containing vinyl compounds havebeen widely studied due to their versatile physiolo-gical activities and applications in transition metalchemistry, asymmetric catalysis and photorearrange-ment[1~4]. In our previous papers, we have reportedthe syntheses of 2,2,4,5-tetrasubstituted-1,3-dithio-les[5] and 2,5-bis(morpholino)-3,4-bis-(p-chloro-phe-nyl)thiophenes[6] by the reactions of α-thioaroyl-thiofor-mamide with trimethyl phosphite at room tempera-ture and in refl… 相似文献
19.
报道了新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与铜的显色反应.在表面活性剂NP-10存在下,pH11.0的Na2B4O7-NaOH缓冲溶液中,该试剂与铜发生显色反应,生成31型的红色配合物,配合物的最大吸收峰位于535mm,表观摩尔吸光系数为1.43×105L·mol-1·cm-1.Cu2+质量浓度在0~480μg/L范围内符合比尔定律.用拟定方法测定合金中微量铜,结果令人满意. 相似文献