共查询到20条相似文献,搜索用时 46 毫秒
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Hans-Joachim Nees Uwe Bergstrßer Heinrich Heydt Manfred Regitz 《Heteroatom Chemistry》1993,4(5):525-530
The (diazoalkyl)phosphanes 4a–e undergo [4 + 1]-cycloaddition reactions with the tetrahalo-orthobenzoquinones 5a,b to furnish the previously unknown (diazoalkyl)phosphoranes 6a–h . The structure of product 6h has been investigated by X-ray crystallography. 相似文献
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Carl G. Krespan 《Journal of fluorine chemistry》1988,40(2-3):129-137
F-Alkyliron tetracarbonyl iodides are convenient sources of terminal vinyl iodides by a simple pyrolytic technique. The precursors to the F-alkyliron tetracarbonyl iodides, an F-alkyl iodide and iron pentacarbonyl, can be used to generate F-alkyl radicals capable, for example, of F-alkylating benzene in moderate yield. Mechanisms for these transformations are proposed. 相似文献
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John Bethke Jürgen Kopf Paul Margaretha Bernard Pignon Léon Dupont Léon E. Christiaens 《Helvetica chimica acta》1997,80(6):1865-1868
Irradiation (λ = 350 nm) of 1H-[2]benzothiopyran-1-one ( 2 ) in the solid state affords selectively and in good yield 6aα, 6bα, 12bα, 12cα -tetrahydrocyclobuta[1, 2-c:4, 3-c′]bis([2]benzothiopyran)-5, 8-dione ( 3 ), the head-to-head (HH) cis-cisoid-cis-cyclodimer of 2 , X-Ray analysis of 2 confirms that this reaction proceeds according to the well-established topochemical principles. The same dimer 3 is obtained in low yields on irradiation of 10−1 M solutions of 2 in either MeOH or MeCN, while no conversion at all is observed in benzene. On irradiation of 2 in MeCN in the presence of tetrachloroethene, the [2 + 2] photocycloadduct 4 is formed in good yield, the conversion 2 → 4 being efficiently quenched by naphthalene. In contrast, no reaction is observed -on irradiation of 2 in the presence of 2, 3-dimethylbut-2-ene, neither in polar nor in apolar solvents. 相似文献
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Teruo Umemoto Yuriko Kuriu Hideo Shuyama Osamu Miyano Shin-Ichi Nakayama 《Journal of fluorine chemistry》1982,20(5):695-698
(Perfluoroalkyl)aryliodonium halides [2] and -tetra- fluoroborates [3] were previously synthesized. We now wish to report the synthesis of several kinds of (perfluoroalkyl)aryliodonium sulfonates which are important as electrophilic perfluoroalkylating agents [4]. 相似文献
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A. Morisato H. C. Shen S. S. Sankar B. D. Freeman I. Pinnau C. G. Casillas 《Journal of Polymer Science.Polymer Physics》1996,34(13):2209-2222
Pure gas and hydrocarbon vapor transport properties of blends of two glassy, polyacetylene-based polymers, poly(1-trimethylsilyl-1-propyne) [PTMSP] and poly(1-phenyl-1-propyne) [PPP], have been determined. Solid-state CP/MAS NMR proton rotating frame relaxation times were determined in the pure polymers and the blends. NMR studies show that PTMSP and PPP form strongly phase-separated blends. The permeabilities of the pure polymers and each blend were determined with hydrogen, nitrogen, oxygen, carbon dioxide, and n-butane. PTMSP exhibits unusual gas and vapor transport properties which result from its extremely high free volume. PTMSP is more permeable to large organic vapors, such as n-butane, than to small, permanent gases, such as hydrogen. PPP exhibits gas permeation characteristics of conventional low free volume glassy polymers; PPP is more permeable to hydrogen than to n-butane. In PTMSP/PPP blends, both n-butane permeability and n-butane/hydrogen selectivity increase as the PTMSP content of the blends increases. © 1996 John Wiley & Sons, Inc. 相似文献
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Sylvain Rault Michel Cugnon De Svricourt Paulette Touzot Max Robba Hussein El-Kashef 《Journal of heterocyclic chemistry》1980,17(7):1399-1404
The nitration and bromination of both [1]benzothieno[3,2-d]pyrimidin-4(3H)one ( 1 ) and [1]benzothieno-[3,2-d]pyrimidine ( 2 ) has been studied. Nitration of 1 at ?30° afforded a mixture of 8-nitro[1]benzothieno-[3,2-d]pyrimidin-4(3H)one ( 7b ) (70%) and 6-nitro[1]benzothieno[3,2-d]pyrimidin-4(3H)one ( 7a ) (30%). However when the nitration was carried out at 60°, the 6,8-dinitro derivative 8 was the result. On the contrary, the nitration of 2 at ?30° gave a single nitration product, 8-nitro[1]benzothieno[3,2-d]pyrimidine ( 11 ). The bromination of both 1 and 2 gave the corresponding 8-bromo derivatives 10 and 13 . Assignment of structure of all the products was based on ir and nmr spectral studies and on unequivocal syntheses. 相似文献
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Abstract Novel, diethyl 1-(isothiocyano)alkylphosphonates 3 have been efficiently synthesized via a one-pot reaction of diethyl 1-azidoalkylphosphonates 1 with triphenylphosphine, followed by in situ transformation of thus formed phosphazenes 2 with carbon disulfide. Application of the title compounds in the synthesis of diethyl (N-phenylthioureido)- and (benzothiazol-2-ylamino)methylphosphonates was also described. 相似文献
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G. I. Zhungietu B. P. Sukhanyuk F. N. Chukhrii L. N. Volovel'skii 《Chemistry of Heterocyclic Compounds》1973,9(2):202-204
The reaction of 2-hydroxymethylene-3-ketosteroids with 2-ketoindoline in the presence of hydrogen chloride gives steroido[3,2-b](carbazole-1-oxonium) chlorides, which split out a 2-ketoindoline molecule under the influence of phenylhydrazine and are converted to steroido[3,2-c]-1-phenylpyrazoles.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 219–221, February, 1973. 相似文献