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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共19条记录   5-Benzyl-3-methylimidazolidin-4-one-Derived Reactive Intermediates of Organocatalysis - A Comforting Resemblance of X-Ray, NMR, and DFT Solid-Phase, Liquid-Phase, and Gas-Phase Structures [作者：Groselj, U; Schweizer, WB; Ebert, MO; Seebach, D,期刊：Helvetica Chimica Acta, 页码：1-13 , 文章类型： Article，,卷期：2009年92-1] The X-ray crystal structures of three (E)-1-cinnamoylidene iminium PF6 salts of 5-benzyl-3-methylimidazolidin-4-ones (2,2-dimethyl-, cis-2-(tert-butyl)-, and cis-2-styryl-substituted; 2-4, resp.) are reported (Figs. 3,5)... The Absolute Configuration of the (+)- and (-)-cis- and (+)- and (-)-trans-1-Benzyl-4-hydroxypiperidine-3-methanols: An Unusual Application of the H-1-NMR-Mosher Method [作者：Clerc, C; Matarazzo, I; Ruedi, P,期刊：Helvetica Chimica Acta, 页码：14-28 , 文章类型： Article，,卷期：2009年92-1] The enantiomerically pure title compounds were prepared and the absolute configurations assigned by the high-field H-1-NMR application of the Mosher method on the bis-MTPA derivatives (MTPA = alpha-methoxy-alpha-(trifluo... Structural Diversity in Thallium Chemistry Part VI Analysis of Structure Correlation in Organoammonium Bromothallates(III) [作者：Linden, A; Petridis, A; James, BD,期刊：Helvetica Chimica Acta, 页码：29-71 , 文章类型： Article，,卷期：2009年92-1] New bromothallate(III) complexes have been synthesized using eleven organoammonium cations related to others employed previously. The crystal structure determinations of eight of these have been pet-formed. The diethylen... Schisanhenones A and B, Two Metabolites of Schisanhenol in Rats [作者：Ma, XL; Lu, Y; Chen, DF,期刊：Helvetica Chimica Acta, 页码：72-77 , 文章类型： Article，,卷期：2009年92-1] Schisanhenones A (2) and B (3), two new metabolites of schisanhenol (1), were isolated from the feces of rats administered orally with 1. Their structures and configurations were elucidated by spectroscopic methods inclu... Preparation and Recognition Mechanism of Gallic Acid Imprinted Polymers [作者：Zhu, XF; Cao, QE; Yang, XQ; Li, F; Wang, GS; Ding, ZT,期刊：Helvetica Chimica Acta, 页码：78-87 , 文章类型： Article，,卷期：2009年92-1] A series of gallic acid (= 3,4,5-trihydroxybenzoic acid; GA) imprinted polymers were prepared in MeOH by noncovalent imprint technology. Their recognition properties and selectivity were characterized by equilibrium bind... Four New C-21 Steroidal Glycosides from the Roots of Cynanchum auriculatum [作者：Gu, XJ; Yao, N; Qian, SH; Li, YB; Li, P,期刊：Helvetica Chimica Acta, 页码：88-97 , 文章类型： Article，,卷期：2009年92-1] Four new C-21 steroidal glycosides with an acyl group at C(12) and a straight sugar chain at C(3), namely auriculosides I-IV (1-4, resp.), along with seven known steroidal derivatives, were isolated from the roots of Cyn... Chlorine-Atom Transfer Reactions between Chloramine (=Chloramide) and Piperidine: Kinetic Reactivity and Characterization in a Raschig Medium [作者：Darwich, C; Elkhatib, M; Steinhauser, G; Delalu, H,期刊：Helvetica Chimica Acta, 页码：98-111 , 文章类型： Article，,卷期：2009年92-1] The kinetics of the Cl-transfer reaction between chloramine (1) and piperidine (2) in a Raschig medium (8 < pH < 9) was studied at various temperatures, with variable concentrations of the two reactants. The influence of... Four New 9,19-Cyclolanostane Derivatives from the Rhizomes of Cimicifuga yunnanensis HSIAO [作者：Nian, Y; Chen, JC; Lu, L; Zhang, XM; Zhou, L; Qiu, MH,期刊：Helvetica Chimica Acta, 页码：112-120 , 文章类型： Article，,卷期：2009年92-1] Four new 9,19-cyclolanostane-type triterpenes, 24-O-acetyl-25-anhydroshengmanol-3-O-beta-D-xylopyranoside (1), 25-O-butylcimigenol-3-O-beta-D-xylopyranoside (2), 12-beta-hydrocimigenol-3-one (3), and 12-beta-hydrocimigen... Five New Cassane-Type Diterpenes from Caesalpinia crista [作者：Yang, ZY; Yin, YH; Hu, LH,期刊：Helvetica Chimica Acta, 页码：121-126 , 文章类型： Article，,卷期：2009年92-1] Five new cassane-type diterpenes, caesalpinista A (1), caesalpinista B (2), caesaljapin B (3), caesaljapin C(4), and caesalpinilinn (5) were isolated from the MeOH extract of the seeds of Caesalpinia crista. Their struct... A New Sesquiterpene from Ximenia americana LINN. [作者：de Araujo, MRS; Monte, FJQ; Braz, R,期刊：Helvetica Chimica Acta, 页码：127-132 , 文章类型： Article，,卷期：2009年92-1] The new sesquiterpene 1, named ximonicane, and the known stigmastane steroid 2 were isolated from the EtOH extract of the sterns of Ximenia americana. Spectroscopic methods, including 2D-NMR techniques, have been used to... Three New Dicoumarins from Daphne feddei [作者：Liang, S; Shen, YH; Tian, JM; Wu, ZJ; Jin, HZ; Zhang, WD; Yan, SK,期刊：Helvetica Chimica Acta, 页码：133-138 , 文章类型： Article，,卷期：2009年92-1] A novel dicoumarinolignoid, feddeiticin (1), the first example with a dicoumarinolignoid skeleton, along with the two new dicoumarin glucosides 2 and 3, were isolated from the stem barks of Daphne feedi. The structures w... Protolimonoids and Limonoids from the Chinese Mangrove Plant Xylocarpus granatum [作者：Cui, JX; Deng, ZW; Xu, MJ; Proksch, P; Li, QS; Lin, WH,期刊：Helvetica Chimica Acta, 页码：139-150 , 文章类型： Article，,卷期：2009年92-1] The phytochemical examination of the fruits of a Chinese mangrove plant Xylocarpus granatum led to the isolation of five new protolimonoids, protoxylocarpins A-E (1-5, resp.). and two new limonoids xylocarpins J and K (6... DFT Studies on the Thermal Activation of Molecular Oxygen by Bare [Ni(H)(OH)](+) [作者：Zhang, X; Schlangen, M; Baik, MH; Dede, Y; Schwarz, H,期刊：Helvetica Chimica Acta, 页码：151-164 , 文章类型： Article，,卷期：2009年92-1] An extensive density-functional theory (DFT) study has been conducted to shed light on the mechanisms of the recently reported gas-phase ion-molecule reactions of mass-selected [Ni(H)(OH)](-) with O-2 (M. Schlangen, H. S... Two New Alkaloids from Incarvillea mairei var. grandiflora [作者：Su, YQ; Shen, YH; Lin, S; Tang, J; Tian, JM; Liu, XH; Zhang, WD,期刊：Helvetica Chimica Acta, 页码：165-170 , 文章类型： Article，,卷期：2009年92-1] Two new alkaloids, isoincarvilline (1) and incargranine A (2), together with two known ones. were isolated from the 80% EtoH extract of the whole plant of Incarvillea mairei var. grandiflora. Their structures were identi... One-Pot Synthesis of 5-Substituted 1H-Tetrazoles from Aryl Bromides with Potassium Hexakis(cyano-kappa C)ferrate(4-) (K-4[Fe(CN)(6)]) as Cyanide Source [作者：Zhu, YZ; Ren, YM; Cai, C,期刊：Helvetica Chimica Acta, 页码：171-175 , 文章类型： Article，,卷期：2009年92-1] A one-pot procedure for the synthesis of 5-Substituted 1H-Tetrazoles through the three-component reaction between an aryl bromide, potassium hexakis(cyano-kappa C)ferrate(4-) (K-4[Fe(CN)(6)]) and NaN3 catalyzed by [Pd(OA... Synthesis of 4-(Methoxycarbonyl)phenyl beta-Lactoside Derivatives Modified at C(6) or C(6 '), and Evaluation of Their Inhibitory Activity on Erythrina cristagalli Lectin-Mediated Hemagglutination [作者：Butera, AP; de Souza, JD; Prado, MAF; Lisboa, MP; Alves, RJ,期刊：Helvetica Chimica Acta, 页码：176-187 , 文章类型： Article，,卷期：2009年92-1] We report herein the synthesis of 4-(methoxycarbonyl)phenyl beta-lactoside and eight derivatives modified at C(6) or C(6'). These compounds were evaluated in hemagglutination inhibition assay using the lectin from Erythr...