共查询到20条相似文献,搜索用时 46 毫秒
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Francesca Benedini Giorgio Bertolini Francesco Ferrario Roberto Guindani Alberto Sala 《Journal of heterocyclic chemistry》1994,31(6):1589-1592
The preparation and the physico-chemical characterization of new heterocyclic organic nitrates containing 1,3-benzoxazine-2,4-dione, 1,3-benzoxazine-2-thion-4-one, 1,3-benzothiazine-2,4-dione and quinazo-line-2,4-dione moieties, are reported. 相似文献
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Georgios Vassilikogiannakis Manolis Stratakis Gerasimos J. Karabatsos Michael Orfanopoulos 《Journal of heterocyclic chemistry》1996,33(3):993-995
Secondary isotope effect measurements of methanol adducts from the reaction of 4-phenyl-1,2,4-triazoline-3,5-dione with 2,5-dimethyl-2,4-hexadiene, support the formation of an aziridinium imide intermediate rather than an open dipolar intermediate in the rate determining step. 相似文献
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4-Phenyl-1,2,4-triazoline-3,5-dione (PTAD) acts as an efficient Michael acceptor in reactions with 1-unsubstituted 2-pyrazolines, giving substituted (3,5-dioxo-4-phenyl-1,2,4-triazol-idin-1-yl)-1-pyrazolines in quantitative yields. Through elimination of molecular nitrogen, the latter are easily transformed into the corresponding cyclopropanes. A reaction of methyl 5-methyl-2-pyrazoline-5-carboxylate with a twofold excess of PTAD leads to an intermediate bisadduct, which undergoes dediazotization to form a 1,3,5-triazabicyclo[3.3.0]octane-2,4-dione derivative. 1-Substituted 2-pyrazolines also add to PTAD with the exception that the 2-pyrazoline structure is retained in the product because of the migration of the C(3)H proton to PTAD. 相似文献
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Spontaneous alternating copolymerization of isobutoxyallene with 4-phenyl-1,2,4-triazoline-3,5-dione
Shin-Ichi Yamamoto Fumio Sanda Takeshi Endo 《Journal of polymer science. Part A, Polymer chemistry》2001,39(10):1564-1571
The spontaneous copolymerization of isobutoxyallene ( 1 ) with 4-phenyl-1,2,4-triazoline-3,5-dione ( 2 ) was carried out to afford a copolymer with a number-average molecular weight of 5900–10,300. The copolymer consisted of a 2,3-polymerization unit of 1 and a NN polymerization unit of 2 , maintaining an alternating character regardless of the monomer feed ratio. The corresponding copolymerization of 1 with 2 in the presence of methanol afforded the adduct of the compounds without the polymer, indicating the generation of a zwitterion of 1 and 2 . © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1564–1571, 2001 相似文献
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Christine Cauvin Bertrand Le Bourdonnec Bernadette Norberg Jean-Pierre Hénichart François Durant 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(11):1330-1332
The crystal structures of three angiotensin-II receptor antagonists involving different spacer groups (CO, CONH and NHCO) between the aryl rings are presented, namely 2-{4-[(3-butyl-1,4-dioxo-2,3-diazaspiro[4.4]non-2-yl)methyl]benzoyl}benzoic acid, C26H28N2O5, (I), 2-{4-[(3-butyl-1,4-dioxo-2,3-diazaspiro[4.4]non-2-yl)methyl]benzamido}benzoic acid, C26H29N3O5, (II), and 2-{4-[(3-butyl-1,4-dioxo-2,3-diazaspiro[4.4]non-2-yl)methyl]anilinocarbonyl}benzoic acid monohydrate, C26H29N3O5·H2O, (III). The aryl rings of (II) are almost coplanar, in contrast with compounds (I) and (III). The conformation of (II) is induced by an intramolecular N—H⋯O hydrogen bond between the amide and carboxylic acid groups. 相似文献
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R. AhmedJ.-P. Anselme 《Tetrahedron》1972,28(19):4939-4946
The oxidation of benzophenone hydrazone with 4-phenyl-1,2,4-triazoline-3,5-dione (PTD) yields benzophenone azine which is also formed from the reaction of the hydrazone with the ylid obtained from diphenyldiazomethane and PTD; the ylid forms a stable addition product with ethanol. With PTD, carbohydrazides are converted to 1,2-diacylhydrazines and small amounts of the corresponding azides; in contrast, p-toluenesulfonylhydrazine yields p-toluenesulfinic acid, isolated as its adduct with PTD, 1-(p-toluenesulfonyl)-4-phenylurazole. Possible mechanisms to rationalize the formation of these products are discussed. 相似文献
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Saoud A. M. Metwally Thanaa A. Mohamed Osama S. Moustafa Yasser A. El-Ossaily 《Chemistry of Heterocyclic Compounds》2007,43(9):1131-1137
Reactions of 4-alkylidene(arylidene)-1-phenylpyrazolidine-3,5-dione with oxidizing (chromium trioxide/acetic acid) as well
as with reducing (sodium borohydride/methanol) agents were carried out. Phenylhydrazine reacted with 4-arylidene-1-phenylpyrazolidine-3,5-diones
via fission of exo C=C bond to give 1-phenylpyrazolidine-3,5-dione and the corresponding aryl hydrazones.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1335–1341, September, 2007. 相似文献
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Irina Chuckowree Murtaza Ali SyedGiulia Getti Asha Parbhu PatelHannah Garner Graham J. TizzardSimon J. Coles John Spencer 《Tetrahedron letters》2012,53(28):3607-3611
A library of benzotriazepines have been synthesised employing microwave-mediated synthesis, supported resins and parallel synthesis methodology. 相似文献