- 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)...
- 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...
- 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...
- 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...
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