Catalytic Conversion of 2-Naphthol to 2-Hydroxy-1,4-naphthoquinone Under Mild Conditions

Introduction 2-Hydroxy-1,4-naphthoquinone (HNQ), existing in natural plants,1,2 is popularly separated and purified as dye or pigment. Recent research results show that, with the function to prevent the formation of protein coenzyme of HIV-I, HNQ can inhibit HIV virus from copying and propagating,3,4 HNQs derivatives and di-chloroallyl lawsone are also the inhibitor for RNA syn-thesis of cancer.5 It is well known that there is a rela-tionship between the side chain attached to HNQ an…     

Bentone-34/OV-1毛细管柱的研制及其分离性能

自行研制了Bentone-34/OV-1高效石英毛细管气相色谱柱,并利用该柱分别对二甲苯、二氯苯和二氯甲苯异构体3种体系进行分析.在选用的色谱条件下,难分离物质对二甲苯和间二甲苯分离度达3;间二氯苯和对二氯苯分离度达1 3.结果表明该柱具有分离效果好,分析速度快的优点.     

Hydrothermal Synthesis,Crystal Structure and Thermal Analyses of Pyrazine-2,3-dicarboxylic Acid Bridged Co(II) Coordination Polymer of _∞~2[Co(phen)(μ-L)_(3/3)]·H_2O (H_2L = Pyrazine-2,3-dicarboxylic Acid)

1 INTRODUCTION Molecular assembly and supramolecular che-mistry are young and rapidly growing subjects andhave attracted great attention. Microporous materialsbuilt up by organic ligands and metal ions have po-tential applications in catalysis, chemical absorption,magnetism and electronic conductivity[1～3]. Multi-dentate organic ligands are good building blocks,such as 1,2,4,5-benzene tetracarboxylic acid (BT-CA), 1,3,5-benzene tricarboxylic acid, terephthalicacid, 1,10-phenanthrol…     

N′-5-四唑基-N-芳甲酰基硫脲的合成及其生物活性研究(I)

为寻找新的高活性农药 ,根据生物等排原理 ,设计合成了 10种未见文献报道的N′ 5 ( 1H 1,2 ,3 ,4 四唑基 ) N 芳甲酰基硫脲类化合物 .它们的结构经IR ,1HNMR和元素分析确证 .初步的生物活性测定结果表明 ,部分化合物具有优良的除草活性或植物生长调节活性 .     

Darstellung und Kristallstruktur von [P(C6H5)4][2,9-{N,N′-(2-NH?(C5H4N))}B10H8]

Synthesis and Crystal Structure of [P(C₆H₅)₄][2,9-{N,N′-(2-NH? (C₅H₄N))}B₁₀H₈] [N(C₄H₉)₄]₂[B₁₀H₁₀] reacts with 2-aminopyridine forming a product mixture from which [2,9-{N,N′-(2-NH? (C₅H₄N))}B₁₀H₈]^? can be isolated by ion exchange chromatography on diethylaminoethyl(DEAE) cellulose. The crystal structure of [P(C₆H₅)₄][2,9-{N,N′-(2-NH? (C₅H₄N))}B₁₀H₈] (triclinic, space group P1 , a = 10.1103(9), b = 11.5665(9), c = 14.877(2) Å, α = 102.600(8), β = 107.567(8) und γ = 96.487(7)°, Z = 2) reveals the bonding of 2-NH₂-(C₅H₄N) via both N atoms to vicinal B atoms of the two square planes of the B₁₀ cluster (B2? N1 = 1,541(7) und B9? N2 = 1.505(7) Å) forming a five-membered ring.     

N-Acyl andN-sulfonyl derivatives of thiazolidines

The major reaction center in the reaction of 4,4-dialkyl-5-methylene-2-phenyliminothiazolidines with acid chlorides or anhydrides and with arenesulfonyl chlorides is the nitrogen atom at position 3 of the ring.Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 12, pp. 2968–2970, December, 1996.     

W／O型微乳液中超氧化物阴离子的产生——微环境中SOD酶活性测定方法 …

分别在水溶液中和W／O型CTAB／正戊醇／异辛烷／水微乳液体系中研究了测定SOD酶活性的邻苯三酚法,发现在反向微乳液中,"小水池"的低介电常数和pH抑制了底物超氧化物阴离子O2-·的产生．只有提高外加缓冲液的pH或"小水池"的水化度,才能得到所需浓度的O2-·,从而初步解决了在微乳液中SOD作用底物的产生问题,为在微乳液中准确测定SOD酶活性创造了条件．     

Host-guest interactions in aqueous media withp-tert.-butylcalix[4]arene bearing polyoxyethylene chains

The interactions ofp-tert.-butylcalix[4]arene bearing polyoxyethylene chains (C3) with pyrene (Py), 1-anilino-8-naphthalenesulfonate (ANS) andN-phenyl-naphthylamine (NPN) in aqueous solution were studied by absorption and fluorescence measurements. Absorption spectral changes and fluorescence enhancements reveal that C3, which has a hydrophobic cavity, can include organic molecules and ions in aqueous solution and form 11 host-guest complexes with ANS and NPN. C3 forms inclusion complexes with Py at different stoichiometries depending on the host: guest molar ratio. Binding constants of 2.2×10⁴, 2.0×10⁴ and 3.6×10⁵ dm³ mol^–1 were calculated for the C3Py, C3ANS and C3NPN complexes (11), respectively, based on the Benesi-Hildebrand equation.Author for correspondence.     

固-液相转移催化1,2,4-三唑N-烷基化的研究

本文研究了相转移催化条件下的1,2,4-三唑烷基化反应。评价了几种相转移催化剂,结果表明PEG是合适的固-液相转移催化剂。在相转移催化剂作用下,用不同的烷基化剂制备了一系列N-1取代的1,2,4-三唑,并对实验的结果进行了讨论。     

A new approach to the synthesis of α-chlorocycloalkanones

α-Chlorocycloalkanones(Ⅳ) were synthesized from cycloalkanones via potassiumα-oxocycloalkylsulfonates(Ⅱ).A two-step mechanism was proposed to explain the formation ofⅣfromⅡ.