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1.
Walter Fischer 《Helvetica chimica acta》1991,74(5):1119-1126
By aromatic nucleophilic substitution followed by intramolecular acylation, 9-oxo-9H-thioxanthene- and 9-oxo-9H-xanthene-dicarboximides were prepared from nitro- or chlorophthalimides and the dianions of thiosalicylic and salicylic acids (Scheme). The 9-oxo-9H-thioxanthene-3,4-dicarboximides were converted to 9-oxo-9H-thioxanthene-3,4-dicarboxylic-acid derivatives such as anhydride, esters, and further imides. Some of these derivatives proved to be excellent photosensitizers with special properties such as liquid aggregation form, H2O solubility, solubility in lipophilic organic solvents and polymers, or bathochromic shifts of the absorption wavelengths. 相似文献
2.
Bruce Coxon Alexander J. Fatiadi Alex Cohen Harry S. Hertz Robert Schaffer 《Magnetic resonance in chemistry : MRC》1980,13(3):187-192
A new monoxanthen‒9‒yl derivative of urea has been synthesized and the structure of this product (N‒9 H‒xanthen‒9‒ylurea) and that of the previously known N,N′‒di‒9 H‒xanthen‒9‒ylurea have been proved by 15N NMR and other spectroscopic techniques. A series of 13C and 15N labeled urea derivatives has been prepared and the utility of their 13C and 15N chemical shifts and coupling constants in the structural analysis of urea derivatives has been investigated. 相似文献
3.
2-(9H-Xanthen-9-ylmethyl)-1H-benzimidazole ( 2a ) was prepared by condensing 9H-xanthene-9-acetic acid ( 1a ) with 1,2-benzenediamine. Similarly, 2-(9H-thioxanthen-9-ylmethyl)-1H-benzimidazole ( 2b ) and its S,S-dioxide ( 2d ) were obtained. Compound 2d was also prepared by oxidizing 2b with hydrogen peroxide in acetic acid. Heating of 9H-thioxanthene-9-acetic acid 10-oxide ( 1c ) with 1,2-benzenediamine gave 9-methylene-9H-thioxanthene ( 3 ). 2-(9H-Thioxanthen-9-ylmethyl)-1H-benzimidazole S-oxide ( 2c ) was obtained by oxidizing 2b with m-chloroperbenzoic acid in acetone. 相似文献
4.
Xianxiu Qiu Pengfei Qiu Tingting Deng Hui Huang Xiaolong Du Xun Shi Lidong Chen 《无机化学与普通化学杂志》2020,646(14):1116-1121
Cu-Fe-S-based compounds gain the interest from thermoelectric community because all the consisting elements, Cu, Fe, and S, are non-toxic and earth-abundant. Comparing with CuFeS2 and Cu5FeS4, the investigation on Cu9Fe9S16 is very rare. In this work, a series of Cu9–xFe9+xS16 samples were fabricated by means of melting-annealing process. Their phase composition, microstructure, electrical and thermal transport properties were systematically investigated. X-ray measurement confirms that all samples are phase pure. Transmission electron microscopy characterization indicates that the fabricated Cu9Fe9S16 has a natural nanostructure. Cu9Fe9S16 shows semiconducting-like electrical transport behavior and intrinsically low lattice thermal conductivity. Beyond the numerous boundaries between nanosized grains, the existence of low-frequency optical phonons is also responsible for the intrinsically low lattice thermal conductivity. Doping Fe at the Cu-sites in Cu9Fe9S16 significantly alters the electrical transport properties by introducing extra carriers. A peak dimensionless figure of merit zT value of 0.21 is obtained at 800 K for pure Cu9Fe9S16, which is comparable with that for CuFeS2. 相似文献
5.
Evangelos Kalatzis Zoi Konga Konstantina Geronikolou 《Journal of heterocyclic chemistry》1996,33(3):961-965
In methanol-water mixtures containing sodium or potassium hydroxide (up to 2.00M) the demethoxylation of 9-methoxyacridine to 9-acridone is of first order in both the free form of 9-methoxyacridine and the hydroxyl ion. The rate of the reaction is increased with an increase in the concentration of water. Sodium perchlorate has a small retarding effect on the reaction. In methanol-water mixtures containing perchloric or hydrochloric acid (up to 3.45M) the demethoxylation is of first order with respect to the protonated form of 9-methoxyacridine. The rate of the reaction decreases with an increase in the concentration of the acid or of sodium perchlorate, but when the concentration of water is increased (≈?1.7 to 50M) and that of the acid is not changed, it reaches a maximum value in mixtures containing 8 to 10M-water. The dechlorination of 9-chloroacridine to 9-methoxyacridine in methanol containing sodium hydroxide or methoxide (up to 0.31 M) is of first order in both the 9-chloroacridine and the hydroxyl or methoxyl ions. 相似文献
6.
Christiane Blanchard Jean-Marc Fabre Claude Montginoul Brat Ali Chaffia Eliane Torreilles Louis Giral 《Journal of heterocyclic chemistry》1978,15(1):149-153
The results of nucleophilic substitution of the 2-methoxy-9-acridone are discussed in terms of competition between both ionic sites N? and O?, of the molecule. They are the first examples of O-alkylation of substituted 9-acridone. 相似文献
7.
Jean M. J. Tronchet Ford Habashi Olivier R. Martin Alain P. Bonenfant Bruno Baehler Jean-Bernard Zumwald 《Helvetica chimica acta》1979,62(3):894-898
Diglycosyl Derivatives. Preliminary communication Novel types of diglycosyl compounds, some of them bearing a resemblance to natural di- or tri-saccharides are described: a diglycosyldiyne ( 1 ), a diglycosylthiophene ( 2 ), a diglycosylaziridine ( 3 ), a diglycosyldioxolane ( 4 ), as well as six C,N-diglycosylnitrones, 9b–9f and 14 . These C,N-diglycosylnitrones, on treatment with an acetylenic Grignard reagent, led to the expected acetylenic diglycosyl-hydroxylamine 11 , whereas diglycosylisoxazolines (f. ex. 10 ) were obtained when these nitrones underwent 1,3-dipolar cycloaddition to acetylenic compounds. 相似文献
8.
A. M. Davletbakova N. Z. Baibulatova V. A. Dokichev S. G. Yunusova M. S. Yunusov 《Russian Journal of Organic Chemistry》2001,37(6):781-783
Methyl (9Z)-12-oxooctadec-9-enoate isomerizes stereoselectively in 86% yield into methyl (10E)-12-octadec-10-enoate in the presence of a complex H2O2-BF3-Et2O. 相似文献
9.
Cross-coupling reactions of 9-iodo-m-carborane with ferrocenylzinc chloride or cymantrenylzinc chloride catalyzed by (Ph3P)2PdCl2 result in the formation of (m-carbo ran-9-yl)ferrocene and (m-carboran-9-yl)cymantrene, respectively.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 542–543, March, 1998. 相似文献
10.
Kiminori Tomimatsu Tadashi Kataoka Hiroshi Shimizu Mikio Hori 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-2):97-110
Abstract cis- and trans-9-Phenylselenoxanthene-N-(arylsulfonyl)selenilimines were synthesized and isolated. Their stereochemistry was ascertained from the NMR spectra. Cis isomers reacted with chloramine-T or -B by an SN 2 type substitution to form trans isomers, but the reverse reaction did not take place. When trans isomers were refluxed in toluene they underwent intermolecular 1,4 rearrangement to give 9-arylsulfonamido-9-phenylselenoxanthene. The cis isomers neither rearranged nor isomerized. On treatment with DABCO, both isomers rearranged intermolecularly to 9-(N-arylsulfonamido)selenoxanthenes at room temperature. Hydrolysis of both isomers yielded trans-9-phenylselenoxanthene 10-oxide. Reactions with p-methoxyphenylmagnesium bromide or methylmagnesium iodide afforded 9-(p-methoxyphenyl)-9-phenylselenoxanthene or 9-phenylselenoxanthene as a main product, respectively. 相似文献
11.
Cal Y. Meyers Hisham G. Lutfi Pninit Varol Yuqing Hou Paul D. Robinson 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):1468-1470
Methylation of 9‐lithiated ap‐9‐pivaloylfluorene, (I), as well as pivaloylation of 9‐lithiated 9‐methylfluorene provided rotationally stable sp‐9‐methyl‐9‐pivaloylfluorene, (III), C19H20O, which lies about a crystallographic mirror plane. Fluorene (I) exists exclusively in the ap configuration in solution (NMR) as well as in the crystalline state, reflecting the unfavorable interaction between the tert‐butyl and fluorene‐ring π electrons in the sp configuration. The existence of (III) exclusively in the sp configuration indicates that, in this case, the interaction between the tert‐butyl group and the fluorene‐ring π electrons provides relatively more thermodynamic stability than the steric interaction between the tert‐butyl and 9‐methyl groups (ap configuration). 相似文献
12.
The present paper deals with the experimental and theoretical determination of energies of conjugation of organic molecules.A computation process has been applied, first to simple molecules comprising an hydrocarbon (styrene), an oxygen function (benzaldehyde) and a nitrogen function (aniline). The results are compared with those obtained from the literature.The application of this computation process to naphthoic acids permits the determination of energies of conjugation and isomerization of these molecules.
Résumé
Dans ce mémoire, il est question de déterminer l'énergie de conjugaison de molécules organiques par voie expérimentale et théorique.Le procédé de calcul que nous avons utilisé a été tout d'abord appliqué à des molécules simples parmi lesquelles figurent un hydrocarbure, le styrène, une fonction oxygénée, le benzaldéhyde et une fonction azotée, l'aniline. Les résultats obtenus ont été comparés à ceux de la littérature.L'application du procédé de calcul aux acides naphtoīques a permis de déterminer l'énergie de conjugaison et d'isomérisation de ces molécules. 相似文献13.
Roger Amouroux Francine Chastrette Maurice Chastrette 《Journal of heterocyclic chemistry》1981,18(3):565-569
The intramolecular oxymercuration of the l-(2-tetrahydrofuryl)4-penten-1-ols (5) by merruric salts followed by reductive demercuration affords the 2-methyl-5-tetrahydrofuryltetrahydrofuran (9) as a mixture of cis and trans isomers in good yields. By using mercuric acetate, each isomier threo 5a and erythro 5b gives the trans isomer, 9d and 9b, respectively, as the major products. On the other hand, cyclizations carried out with mercuric chloride are not stereoselective. 相似文献
14.
Ichizo Okabayashi Hidetoshi Fujiwara Chika Tanaka 《Journal of heterocyclic chemistry》1991,28(8):1977-1979
Cyclization of 2-chloro-6-[(3-chlorophenyl)thio]benzoic acid ( 2 ) gave a mixture of 1,8-, 3 , and 1,6-dichloro-9H-thioxanthen-9-ones 4 . The mixture was converted to 1,8-diamino- 7 , and 1-amino-6-chloro-9H-thioxanthen-9-ones 8 , from which 3 and 4 were prepared separately, respectively. From a mixture of 4 and 3,6-dichloro-9H-thioxanthen-9-one ( 11 ) obtained by cyclizing 4-chloro-2-[(3-chlorophenyl)thio]benzoic acid ( 10 ) was separated 11 by conversion of 4 to 8 . 相似文献
15.
Bi9Rh2Br3, Bi9Rh2I3, and Bi9Ir2I3 – A New Structure Family of Quasi One‐dimensional Metals Bi9Rh2Br3, Bi9Rh2I3, and Bi9Ir2I3 were synthesized from the elements using niobium bromides or iodides as auxiliaries to modify the partial pressures in the course of the reaction. X‐ray diffraction on single crystals showed that the compounds are not isomorphous. However they have a common structural principle: strands of condensed [MBi8] polyhedra, which are separated by halide anions. The spatial arrangement of the [MBi1/1Bi7/2] strands differs with the combination of elements: In Bi9Rh2I3 (monoclinic, P21/m (no. 11), a = 775.6(1), b = 1374.9(2), c = 901.1(2) pm, β = 109.29(2)°) all strands are oriented parallel to each other. Bi9Rh2Br3 (monoclinic, P21/m (no. 11), a = 927.98(8), b = 1372.1(1), c = 1992.7(2) pm, β = 100.77(1)°) and Bi9Ir2I3 (orthorhombic, Pnma (no. 62), a = 2677.5(5), b = 1394.2(2), c = 967.6(1) pm) are ordered polytypes with two orientations changing in alternating layers of characteristic widths. The experimental proof of metallic conductivity in Bi9Ir2I3 supports the assumption of delocalised electrons inside the [MBi1/1Bi7/2] strands. The magnetic susceptibility of Bi9Rh2Br3 increases slowly with decreasing temperature and shows a local maximum at about 14 K. 相似文献
16.
The copper‐rich intermetallics CaCu9Cd2 and EuCu9Cd2 were synthesized from the elements in sealed tantalum tubes in a high‐frequency furnace. Both compounds were characterized by X‐ray powder and single crystal diffraction: Ce(Mn0.55Ni0.45)11 type, P4/mbm, a = 844.2(1), c = 504.72(8) pm, wR2 = 0.0216, 345 F2 values, 23 variables for CaCu9Cd2 and a = 844.1(2), c = 505.5(1) pm, wR2 = 0.0200, 331 F2 values, 24 variables for EuCu9.14Cd1.86. The europium‐based crystal showed a small mixed Cu/Cd occupancy on the 4g site. The calcium (europium) atoms have the high coordination number 20 (16Cu + 4Cd). These polyhedra are condensed via common Cu4 squares along the c axis. Other striking structural motifs are segregated Cd2 pairs (291 pm in CaCu9Cd2) in copper coordination and slightly distorted Cu2@Cu8Cd4 icosahedra. The latter are connected via common Cd2 pairs along c and form the motif of tetragonal rod packing. EuCu9Cd2 shows paramagnetic behavior above 100 K with an experimental magnetic moment of 7.82(1) μB/Eu atom, indicating purely divalent europium. 相似文献
17.
Ichizo Okabayashi Noriko Murakami Kaoru Sekiya 《Journal of heterocyclic chemistry》1989,26(3):635-637
1, 5-Dichloro-9H-thioxanthen-9-one ( 2 ) was prepared by cyclization of 2-chloro-6-[(2-chlorophenyl)thio]-benzoic acid ( 10 ) obtained from 2-chloro-6-iodobenzoic acid ( 9 ) and 2-chlorobenzenethiol. Similarly, 1, 7-di-chloro-9H-thioxanthen-9-one ( 6 ) was prepared from 9 via 2-chloro-6-[(4-chlorophenyl)thio]benzoic acid ( 11 ). Compound 6 was also obtained by condensation of 2-chloro-6-mercaptobenzoic acid ( 12 ) with chlorobenzene in the presence of sulfuric acid. 相似文献
18.
H. Binder R. Kellner K. Vaas M. Hein F. Baumann M. Wanner R. Winter W. Kaim W. Hnle Y. Grin U. Wedig M. Schultheiss R. K. Kremer H. G. von Schnering O. Groeger G. Engelhardt 《无机化学与普通化学杂志》1999,625(7):1059-1072
Halogenation of nido-B10H14 with C2H2Cl4, C2Cl6, Br2, or I2, produces by cluster degradation the (2 n)-closo-clusters B9X9 (X = Cl, Br, I). The synthesis of salts of the perhalogenated radical anions of the type (2 n + 1)-closo-[B9X9]· – and of the corresponding dianions (2 n + 2)-closo-[B9X9]2– from neutral B9X9 is described [n is the number of cluster atoms; (2 n), (2 n + 1), and (2 n + 2) is the number of cluster electrons]. Molecular and crystal structures of B9Cl9, B9Br9, [(C6H5)4P][B9Br9] · CH2Cl2, and [(C4H9)4N]2[B9Br9] · CH2Cl2 have been determined via X-ray diffraction. All three oxidation states of the cluster retain the tricapped trigonal prism. The reduction of the clusters B9X9 was shown by cyclic voltammetry in CH2Cl2 to proceed via two successive one-electron reversible steps, separated by at least 0.4 V. The paramagnetic radical anions [B9X9]· – (X = Cl, Br) were further characterized by magnetic susceptibility measurements of [Cp2Fe][B9X9] and [Cp2Co][B9X9], respectively. The EPR spectra of [B9X9]· – (X = Cl, Br, I) in glassy frozen CH2Cl2 solutions showed increasing g anisotropy for the heavier halogen derivatives, illustrating significant halogen participation at the singly occupied MO. The 11B NMR spectra of CD2Cl2 solutions of the neutral clusters B9X9 exhibit only one sharp resonance, indicating that the boron atoms are highly fluxional in solution. In contrast, two different boron resonances as expected for a rigid tricapped trigonal prism are clearly observed for the [B9X9]2– dianions in solutions and for solid B9Br9 in the 11B MAS NMR spectra. Temperature dependent 11B MAS NMR experiments on B9Br9 and [B9Br9]2– in the solid state show a reversible coalescence of the two resonances at higher temperature. 11B MAS NMR spectra and DTA measurements of [B9Br9]2– showed a phase transition. 相似文献
19.
R. Faure J.-P. Galy A. Mahamoud E.-J. Vincent A.-M. Galy J. Barbe 《Magnetic resonance in chemistry : MRC》1983,21(1):36-38
Carbon-13 NMR parameters were determined for some 9-alkoxy- and 9-alkylthio-acridines as solutes in DMSO-d6 or D2O. 相似文献
20.
Zusammenfassung Der Germanat-Zeolith Ag3HGe7O16·4 H2O wird durch Ionenaustausch aus dem isotypen Ammonium-Zeolith hergestellt. Nach Dehydratation des Ag-Zeoliths bildet sich bei 460°C das zuMe
4Ge9O20 (Me=Na, K) isotype Ag4Ge9O20. Durch Erhitzen auf 650°C entsteht das zuMe
2Ge4O9 (Me=Na, K, Rb, Tl) isotype Ag2Ge4O9. Oberhalb 760°C erfolgt unter Dissoziation die Bildung von metallischem Silber und GeO2 (Rutilform).
Mit 1 Abbildung 相似文献
The zeolithic germanate Ag3HGe7O16·4 H2O has been prepared by ion-exchange from the analogous ammonium compound. After dehydration at 460°C Ag4Ge9O20 is formed, which is isostructural withMe 4Ge9O20 (Me=Na, K). By heating up to 650°C Ag2Ge4O9 is obtained, having the structure ofMe 2Ge4O9 (Me=Na, K, Rb, Tl). Above 760°C the compound decomposes into silver, oxygen and GeO2 (rutile).
Mit 1 Abbildung 相似文献