共查询到20条相似文献,搜索用时 15 毫秒
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通过大孔苯乙烯-二乙烯苯共聚体的硝化、还原和重氮化反应制得的交联聚苯乙烯重氮盐分别同取代酚(或芳香胺)羧酸或磺酸化合物(如水杨酸、对羟基苯甲酸、2,4-二羟基苯甲酸、没食子酸、2-羟基-3-羧基萘、磺基水杨酸、对氨基苯磺酸、4-羟基萘磺酸)和水杨醛等进行偶合反应制得了一类新型阳离子交换树脂。另外,还研究了反应介质的pH值和偶合试剂的结构等因素对偶合反应的影响。合成的离子交换树脂对铜离子和铁离子等有良好的选择性和对某些维生素和抗菌素有好的吸附-解吸性能。 相似文献
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Abstract Methylthiomethylphosphonous dichloride, MeSCH2PCI2 (1), is synthezised by the reaction of MeSCH2SnBun, with phosphorus trichloride. Substitution reactions to give MeSCH2PX2 (X=NEt2, OPri, F, Ph) are described. The phosphorus(III) compounds are readily converted to the corresponding phosphonyl and thiophosphonyl derivatives, MeSCH2P(Z)X2 (Z=O, S), and the phosphorane, MeSCH2PF4, respectively. Chlorination of the methylene group to give compounds of the type MeSCHCIP(O)X2 and MeSCCI2P(O)X2 is reported. 相似文献
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ROM HARRÉ 《Foundations of Chemistry》2008,10(1):19-38
The project of chemistry to classify substances and develop techniques for their transformation into other substances rests on assumptions about the means by which compounds are constituted and reconstituted. Robert Boyle not only proposed empirical tests for a metaphysics of material corpuscules, but also a principle for designing experimental procedures in line with that metaphysics. Later chemists added activity concepts to the repertoire. The logic of activity explanations in modern times involves hierarchies of activity concepts, transitions between levels through non-dispositional groundings. Such hierarchies terminate in powerful particulars, such as elementary charged particles. Do these have a fundamental place in the most recent accounts of molecular architecture, stabilities and transformations? However, a close study of the contemporary chemistry of substances transforming reactions discloses a hybrid metaphysics, making use of both the Boylean corpuscles and Faradayan fields. This is illustrated by an analysis of the metaphysics inherent in John Polanyi’s use of “chemoluminescence” to follow the formation of products in chemical reactions. A brief sketch of a resolution of the tension between the two metaphysical schemes is drawn from Niels Bohr’s radical metaphysics extended from the quantum realm proper to chemistry (and perhaps beyond). 相似文献
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David A. Bowman Donald B. Denney Dorothy Z. Denney 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):229-232
Abstract The title compounds were prepared by allowing the appropriate dialkylphenylphosphonite to react with neopentyl and cyclopentyl benzenesulfenates. Extensive variable temperature 13C nmr studies on tetraneopentyloxyphenylphosphorane showed no changes. 18O labeled benzoic acid was allowed to react with tetraneopentyloxyphosphorane to give neopentyl benzoate. The isotope study shows that the benzoic acid attacks on the methylene carbon of the neopentyl moiety. 相似文献
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Richard J. Cremlyn Brian B. Dewhurst Ismail Khattak 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):325-332
Abstract Cholesteryl N-phenylphosphoramidic chloride has been converted to the corresponding phosphoramidic hydrazide and azide. The former compound was characterised by the preparation of a number of hydrazones, while the latter has been reacted with norbornene, dimethylsulphoxide, and triphenylphosphine. However, the azide did not react with decane, o-anisole, or butylamine. 17-Oxoandrost-5-ene-3β-yl N-phenylphosphoramidic chloride was prepared and was converted to the hydrazide, but a pure sample of the azide could not be isolated. Cholesteryl N-phenyl phosphoramidic triphenylphosphinimine has been reacted with eight carbonyl compounds and the structures of the products investigated. Cholesteryl N-cyclohexylphosphoramidic chloride was converted to the azide and the triphenylphosphinimine; the latter was reacted with acetone and p-nitrobenzaldehyde. Cholesteryl phosphorodichloridate has been condensed with phenol, p-nitrophenol, and p-methoxyphenol to give the corresponding O-arylphosphorochloridates. The O-phenyl and O-p-methoxyphenyl phosphorochloridates have been converted to the corresponding azides, but the azide from the p-nitrophenyl derivative could not be isolated. The reactions of cholesteryl phosphorodichloridate with diethylamine, hydrazine, and sodium azide have also been examined; and cholesteryl phosphorodichloridothioate has been condensed with aniline and benzylamine. 相似文献
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M. Z. A. Badr S. A. Mahgoub F. F. Abdel-latif A. A. A. Abd El-Hafez 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4):175-183
Abstract 3,5-Dicyano-6-mercapto-4-phenylpyridin-2(1H)-one (1) was reacted with ethyl chloroacetate to give compound (II) which on reaction with hydrazine hydrate gave the corresponding hydrazide derivative (III). Acylation of (III) with acetic acid, phenylisocyanate, or phenylisothiocyanate gave different monoacyl derivatives (IV-VI). Condensation of III with aromatic aldehydes and acetylacetone gave compounds VIIa-c, VIII respectively. Compound I was reacted with chloroanilides, bromoacetone and phenacyl bromide to yield the IX-XI; these and compound II gave thieno[2,3-b]-pyridines (XU-XV) on treatment with sodium ethoxide solution. Reaction of XII with acetic anhydride gave the diacetyl derivative XVI. Hydrolysis of compound XII with sodium hydroxide gave the corresponding acid (XVII) which on treatment with acetic anhydride gave the oxazine derivative (XVIII). Reaction of oxazine compound XVIII with ammonium acetate and hydrazine hydrate gave pyrido[3′,2′:4,5] thieno[3,2-d]pyrimidin-4.7-dione derivative (XIX) and (XX) respectively. The N-amino derivative (XX) was reacted with 4-nitrobenzaldehyde to give the corresponding azomethine (XXI). Significant in vitro gram-positive and gram negative antibacterial activities as well as anti-fungal effect were observed for some members of the series. 相似文献
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Manfred Fild Wolfgang Handke 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):337-340
Abstract The synthesis of the thiophosphonic dichloride Cl2PCH2P(S)Cl2 (1) is reported and some of its reactions are described. A detailed investigation of the aminolysis of 1 and the corresponding F2PCH2P(S)F2 (2) reveals a stepwise substitution pattern. 相似文献
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Kuzhikalail M. Abraham Rebecca Schiff 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):177-181
Abstract Some reactions of the aliphatic amides, CH3CONH2, CH3CONHCH3, CH3CON(CH3)2 and CH3CON(C2H5)2 with elemental S and sodium sulfides, Na2S n , n ≥ 1, have been studied. The initial reaction product with elemental sulfur appears to be a substituted polysulfane, CH3COS n NR, formed by the insertion of the sulfur chain into the C[sbnd]N bond. This product decomposes on further heating, forming COS as the major gas product. In solutions of Na2S n in the amides, the reactive material appears to be elemental S, present in equilibrium with S n ?2. In the N-dialkyl substituted amides, CH3CON(CH3)2 and CH3CON(C2H5)2, the tetrasulfide is uniquely stabilized by solvent coordination so that solutions of Na2S4 in these amides are stable for long periods of time at 130°C. 相似文献
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《合成通讯》2013,43(21):3361-3376
The preparation of 4-hydroxy-1-methyl-3-(5-oxo-4,5-dihydro-1H-3-pyrazolyl)-1,2-dihydro-2-quinolinone (3) and its hydrazono-, aminomethylidene- and arylidene derivatives has been achieved. The synthesis of fused heterocyclic polynuclear systems containing quinolinone moiety is also described. 相似文献
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聚合物囊泡和空心球是具有重要理论研究价值和在很多领域特别是在生物医药方面具有潜在应用的大分子组装体本文综述了高分子囊泡及空心球的制备方法及某些新发展其传统的制备方法主要包括嵌段共聚物自组装法和聚合物胶束去核法以及模板上合成着重讨论了近年来新发展起来的非共价键合自组装法(NCCM)以及通过化学反应一步从单体获得聚合物空心... 相似文献
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Donald B. Denney Dorothy Z. Denney Stanley G. Schutzbank 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):369-372
Abstract The reaction of the isomeric phosphites, 1 and 2, with ozone have been shown to be stereospecific and to proceed with retention of configuration about phosphorus. Similarly ozonization of mixtures of 3 and 4 were found to be stereospecific or very nearly so with retention of configuration about phosphorus. The mechanistic implications of these findings are discussed. Reactions of 1 and 2 with neopentyl and t-butyl hypochlorites proceed in a stereochemically random manner. The formation of a pentacoordinated intermediate is implicated. Reactions of a mixture of 1 and 2 with ethyl thiyl radicals provided phosphorothionates with complete retention of configuration. 相似文献
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Ahmed M. Farag Hamdi M. Hassaneen Ikhlas M. Abbas Ahmad S. Shawali Mohamad S. Algharib 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):243-249
Abstract 2-(Thiocyanatoacetyl)thiophene 2 and its selenium analog 3 couple with diazotized anilines and yield 3-aryl-2-imino-5-(2-thenoyl)-2,3-dihydro-1,3,4-thiadiazoles 6 and 3-aryl-2-imino-5-(2-thenoyl)-2,3-dihydro-1,3,4-selenadiazoles 7 respectively. The reactions of both 6 and 7 with nitrous acid, acetic anhydride and benzoyl chloride are described. Azo coupling of 2-amino-4-(2-thienyl)thiazole 17 and its selenazole analog 18 with diazotized anilines yielded the arylazo derivatives 19 and 20 respectively. Reaction of the hydrazidoyl bromide 16 with potassium thiocyanate, potassium selenocyanate, thiourea and selenourea yields 6, 7, 19, and 20 respectively. 相似文献
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Donald R. Hogg Mohammad A.M. Rashid 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-2)
Abstract The coloured solutions of 2-nitrobenzenesulphenyl derivatives in 98% sulphuric acid have previously been suggested to contain either the conjugate acid of the sulphenyl derivative1 or the sulphenium ion in equilibrium with the starting material. 19F n.m.r. studies on solutions of 4-trifluoromethyl-2-nitrobenzenesulphenyl derivatives show that these compounds react in sulphuric acid to give the corresponding 2-amino- and 2-nitro-benzenesulphonic acids together with other products. 相似文献