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1.
Abstract The mass spectra of some 2-thiophenemercuric derivatives are determined and the fragmentation interpretations are based on mechanistic analogy and supported in some cases by metastable peaks and low energy mass spectra. They all fragment ultimately to the 2-thienyl cation formed either through a two-step process, by cleavage of Hg[sbnd]X bond to give the 2-thienylmercuric cation, followed by extrusion of mercury, or by a one-step process through cleavage of carbon-mercury bond. Their base peaks being the C3H3 +ion (m/e 39). 相似文献
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M. Elbanowski 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):111-116
Abstract The photochemical reactions occurring in the system S8 + CH3OH in the liquid phase were investigated, in the presence of, and without sensitizers. The experimental conditions were identical with those employed in studying the quenching of fluorescence.1 The decay of S8 is more rapid in the presence of sensitizers (the quantum yield and the degree of conversion are higher). In the system studied irradiation by UV light (λ 254 nm) causes the formation of (CH3)2S and of trace amounts of CH4 and C2H6. The process of S8 decay is of a mixed kinetic character—a pseudo 1st order process predominating, with a contribution from a 2nd order reaction. A possible reaction scheme, associated with excitation energy transfer from sensitizers to S8 is discussed. 相似文献
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I. M. Abd-ellah E. H. M. Ibrahim A. N. El-khazandar 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2-4):239-247
Abstract Interaction of chlorocyclodiphosphazanes (I) with some bifunctional reagents (such as phenylurea, diphenylurea, thiourea and its phenyl derivatives) in acetonitrile furnished geminal and nongeminal aminocyclodiphosphazanes of type (II–V). The structures of the isolated products were proposed on the basis of microanalytical data, infrared, ultraviolet, 1H n.m.r., and mass spectra. The mechanism of the nucleophilic substitution is also discussed. 相似文献
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含氮杂环三烃基锡衍生物的合成及其生物活性 总被引:8,自引:3,他引:8
本文合成了14个含氮杂环三烃基锡衍生物,红外光谱,核磁共振谱和质谱的研究表明三烃基锡-1,2,4-三氮唑为以氮原子作桥联的五配位聚合结构化合物,化合物的生物活性和生物选择性主要取决于锡原子上的三烃基。 相似文献
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Etify A. Bakhite Abdu E. Abdel-Rahman Omima. S. Mohamed Eman A. Thabet 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):1983-2006
(4-Aryl-3-cyano-6-(2-thienyl)pyridin-2-ylthio)acethydrazides (5a–c), 3-amino-4-aryl-6-(2-thienyl)thieno[2,3-b]pyridine-2-carbohydrazides (6a–c) and 3-amino-4-phenyl-6-(2-thienyl)thieno[2,3-b]pyridine-2-carboxylic acid (30) were prepared and employed as key intermediates in the synthesis of the title compounds. 相似文献
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Charles O. Okafor 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2-3):323-340
Abstract A survey of the chemical literature recently undertaken by us, has revealed that much greater attention is being given nowadays to organo-sulfur compounds. New products containing sulfur have emerged and many of them were isolated from coal, 3 plant, animals' and soil microbes. 6 A great majority of them are, however, man-made and are obtained by intricate but often exciting synthetic procedures which give rise to new reactions, new chemistry and a great variety of potentially useful chemical compounds. These studies led to the synthesis of derivatives of phenothiazine (1)7 the sulfur analog of phenoxazine, and to dithieno(2,3-b: 2′,3′-e)(l,4)thiazine (2)′, cyclopental(1,2-b: 4,3-bf)-dithiophene (3)9 and benzothienoacridine (4) derivatives which are thiophene analogs of phenothiazine, fluorene and benz(c)acridine respectively. 相似文献
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Y. Yano T. Matayoshi K. Misu W. Tagaki 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):25-36
Abstract Various S-allyl sulfonium salts were allowed to react with bases (EtONa/EtOH, NaH/THF). From product analyses, it was found that modes of reaction depend on both the structure of sulfonium salts and the bases employed. Among the observations, it is worthy to note the formation of cyclopropane derivatives from some allyl sulfonium salts. 相似文献
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苏莉 《理化检验(化学分册)》2006,42(10):793-795
采用高效液相色谱法对高效除草剂盖草能的中间体2-氯-5-三氯甲基吡啶(TCMP)及相关化合物的分析条件进行了探讨和优化。使用Zorbax eclipse XDB-C18色谱柱,以乙腈-水(30+70,体积比)为流动相,控制流速1 mL.min-1,采用紫外可变波长检测器,检测波长为240 nm,方法的线性关系良好,相关系数为0.998 4,回收率为99.05%。在实样分析中同时测定了合成TCMP过程中的两个主要副产物2-氯-5-氯甲基吡啶和2-氯-3-三氯甲基吡啶。 相似文献
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Abdel Moneim El-Ghanam 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6):1075-1083
3-Chloro-2-phenyl-6-p-tolyl and 3-chloro-2,6-di-p-tolyl-4H-thiopyran-4-ones have been synthesized in moderate yieldes from the reaction of 3-chloro-tetrahydrothiopyran-4-ones with phosphorus pentachloride. Their thiones, oximes, and hydrazones have been also prepared. Treatment of thiones with malononitrile gave the corresponding 3-chloro-4-thiopyrylidenemalononitriles which gave 3-chloro-spirothiopyran derivatives of pyrazole, isoxazole, 1,3-thiazines when treated with hydrazine hydrate, hydroxylamine hydrochloride, thiourea and thiosemicarbazide, respectively. While treatment of 3-chloro-thiopyrylidene-malononitriles with acetylacetone gave the corresponding 3-chloro-spirothiopyran derivatives of pyran. 相似文献
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Homaid A. Al-Madfa Robert A. Shaw Sidit Ture 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4):333-338
Abstract The reactions of hexachlorocyclotriphosphazatriene, N3 P3 CI6, with 2, 2-dimethylpropane-1, 3-diol yield monospiro-, N3 P3 Cl4 [(OCH2)2 CMe2, dispiro-, N3 P3 Cl4((OCH2)2CMe2|2, and trispiroderivatives, N3 P3 ((OCH2)2, CMe2]3. An ansa, N3 P3 CI4 [(OCH2)2 CMe2]2 and a spiro-ansa, N3 P3 Cl2- ((OCH2), CMe2,]2 and a doubly-bridged compound, (N3 P3 Cl4,)2[(OCH2)]2 were also isolated. Product types and relative yields were compared with those arising from propane-1, 3-diol. The yields of ansa products from the reactions of the dimethyl diol seem to be considerably enhanced relative to those of its unmethylated analogue. 31P and 1H n.m.r. spectra are reported. 相似文献
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Kh. M. Hassan A. M. Kamal El-Dean M. S. K. Youssef F. M. Atta M. S. Abbady 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):283-289
Abstract Thienopyridine oxazinone (1) has been prepared and explored as a precursor by its reaction with some reagents namely, ammonium acetate, aliphatic amines, aromatic amines, hydrazine hydrate, thiosemicarbazide, and ethyl glycinate to give pyridothienopyrimidines (11-VII). The pyrimidinone compound (11) was converted to the 4-chloro derivative (X) by its reaction with excess POCl3 Interaction of the 4-chlorocompound (X) with some reagents namely, hydrazine hydrate, methyl amine, aniline, sodium thiophenolate, ethyl glycinate, thiosemicarbazide and thiourea, yielded pyridothieno-pyrimidine derivatives (XI-XVII) substituted at 4-position, respectively. 相似文献
12.
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
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A. Mobinikhaledi N. Foroughifar H. Fathinejad Jirandehi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):2259-2263
Pyrimidine derivatives 4a–ewere synthesized by Biginelli reaction under microwave irradiation. The effectiveness of different baths or containers including ceramic, silica gel, potsherd, alumina, and molecular sieve as heat sinks in mediating the microwave irradiation for the formation of 4a–ehas been investigated. All one-pot condensations of β -Ketoester 1, aryl aldehyde 2, and (thio)urea 3in heat sinks provide high yields of the desired compounds, particularly when reactions are run at low temperature. In addition, we found that potsherd and ceramic are suitable heat sinks for preparation of these cyclocondensation products under microwave irradiation. 相似文献
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Ali A. Abdel Hafez Ibrahim M. A. Awad 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):381-389
Abstract Some new sulphonyl-N-heterocyclo-8-hydroxy quinolines have been synthesised by the reaction of 8-hydroxyquinoline-5-sulphonyl hydrazide with different active methylene compounds. The pyrazole, pyrazoline, pyrazolidine and pyridazine derivatives were reacted with some metal cations to give the corresponding chelates. All synthesized compounds have been screened in vitro for their biological activities. 相似文献
20.
Edrissi认为Cr(Ⅲ)与1-羟基-2(1H)-吡啶硫酮(HPT)的甲基衍生物不能给出任何反应,并且将与HPT的配合物注明为绿色溶液。本文在过去工作的基础上合成了S-(1-氧化-2-吡啶基)硫代苯甲酸酯(PTB)和3-CH_3-PTB;并合成了3个铬配合物。通过元素分析,紫外-可见,红外光谱,摩尔电导和TG-DTA-DTG作了表征。探讨了形成机理并研究了抑菌活性。 相似文献