通过1 H NMR光谱,MALDI-TOF研究了对称的α,α',δ,δ'-四甲基葫芦[6]尿素(TMeQ [6])与一系列烷基二铵离子在水溶液中和固态时的结合相互作用质谱,X射线晶体学和等温滴定热量法(ITC)。他们的11 H NMR光谱表明,实际的结合行为根据烷基链的长度而变化。他们的单晶X射线衍射分析表明,来宾1,2-乙烷二铵位于TMeQ [6]门的外部,而其他四个烷基二铵来宾可以容纳在TMeQ [6]腔中,形成1:1夹杂物复合体。最重要的是,长链烷基二铵(1,8-辛烷二铵和1,10-癸二铵)在TMeQ [6]腔内结合时具有扭曲的构象。另外,ITC实验表明,烷基二铵客体与TMeQ [6]的络合主要是由焓驱动的,这得益于离子-偶极相互作用。
Mechanisms of Acid Decomposition of Dithiocarbamates. 2. Efficiency of the Intramolecular General Acid Catalysis
作者:Eduardo Humeres、Nito A. Debacher、M. Marta de S. Sierra
DOI:10.1021/jo981382i
日期:1999.3.1
M. The acid decomposition of the dithiocarbamic conjugate acid of EbisDTC anion proceeds through a fast N-protonation and a slower C-N breakdown. The intramolecular general acid catalysis rate constant is (8.2 +/- 2.8) x 10(6) s(-)(1), but the efficiency of this fast proton transfer is only (14.3 +/- 4.9) M. The intramolecular general acid catalysis of the free acid forms of the carboxylic and dithiocarbamic
The aminolysis of N-aroyl β-lactams occurs by a concerted mechanism
作者:Wing Y. Tsang、Naveed Ahmed、Michael I. Page
DOI:10.1039/b616420j
日期:——
insignificant solvent kinetic isotope effect, kH2ORNH2/kD2ORNH2, of 1.01 for the aminolysis of N-benzoyl beta-lactam with 2-methoxyethylamine. The Bronsted betalg value decreases from -1.03 to -0.71 as the amine nucleophile is changed from 2-cyanoethylamine to propylamine. The Bronsted betanuc value is more invariant although it changes from +0.90 to +0.85 on changing the amide leaving group from p-methoxy
Intra- and inter-molecular catalysis in the aminolysis of benzylpenicillin
作者:Jeffrey J. Morris、Michael I. Page
DOI:10.1039/p29800000212
日期:——
for the aminolysis of benzylpenicillin in water is reported. The Brønsted β-values for the uncatalysed, the amine-catalysed, and hydroxide-ion catalysed reactions are 1.0, 1.09, and 0.96 respectively. This indicates that in the transition states for all three pathways the amine nucleophile contains a unit positive charge which is consistent with the formation of a tetrahedralintermediate. Intramolecular
Photochemical Generation of μ-Amido-μ-peroxo-bis[bis(ethylenediamine)cobalt(III)] Complex from the Corresponding μ-Hyperoxo Complex in Neutral Aqueous Solution
作者:Nobuyoshi Shinohara、Emiko Kose、Wataru Ohkubo
DOI:10.1246/bcsj.61.3338
日期:1988.9
μ-peroxo complex, together with mononuclear cobalt(III) complexes upon irradiation with near-ultraviolet light in a neutralaqueoussolution. The result is different from that obtained in an acidic aqueoussolution, in which the products are [Co(NH3)(en)2(H2O)]3+ and Coaq2+. The photochemical reaction mechanisms are discussed.
[EN] COMBINATION CHEMOTHERAPY COMPOSITIONS AND METHODS<br/>[FR] COMPOSITIONS CHIMIOTHERAPEUTIQUES COMBINEES ET PROCEDES CORRESPONDANT
申请人:NOVOGEN RES PTY LTD
公开号:WO2004030662A1
公开(公告)日:2004-04-15
This invention relates to combination therapies involving anticancer chemotherapeutic agents and isoflavones or analogues thereof. The invention further relates to compounds, compositions, methods and therapeutic uses involving, containing, comprising, including and/or for preparing platinum-isoflavonoid complexes suitable for use in the combination therapies of the invention.