(η<sup>5</sup>-Cp*)Rh(III)/Ir(III) Complexes with Bis(chalcogenoethers) (E, E′ Ligands: E = S/Se; E′ = S/Se): Synthesis, Structure, and Applications in Catalytic Oppenauer-Type Oxidation and Transfer Hydrogenation
作者:Om Prakash、Kamal Nayan Sharma、Hemant Joshi、Pancham L. Gupta、Ajai K. Singh
DOI:10.1021/om401150s
日期:2014.2.24
Oppenauer-type oxidation of alcohols and transfer hydrogenation of ketones with 2-propanol. 3 and 6 were the most efficient in the two catalytic reactions (TON values up to 9.9 × 102 and 9.8 × 103, respectively) and were therefore investigated in detail. 3 is the first example of a Rh(III) species explored for Oppenauer-type oxidation. The catalysis appears to be homogeneous. In transfer hydrogenation it appears
The products of the title reaction depend upon the relative concentrations of reactants. With equimolar concentrations or an excess of 2-chloroalkyl phenyl selenide, the products are 1,2-dicloroethane and a diaryldiselenide. When excess areneselenenyl chloride is used ,the products are a diaryldiselenide and 2-chloroalkyl phenyl selenide dichloride. A mechanism involving nucleophilic displacement
标题反应的产物取决于反应物的相对浓度。当具有等摩尔浓度或过量的2-氯烷基苯基硒化物时,产物为1,2-二氯乙烷和二芳基二硒化物。当使用过量的芳烃烯基氯时,产物为二芳基二硒烯和2-氯烷基苯基硒化二氯。提出了一种涉及硒烯基硒上亲核取代的机理来解释所观察到的产物。硒烯烯基氯的4位上的硒化物或不同取代基的结构变化对反应速率的影响很小。在提出的Se(II)亲核取代反应机理的连续机制中,类似S N 2的过渡态最能说明该数据。
Method of treating drug resistant tumor cells using organoselenones
申请人:The University of Sourthern California
公开号:US05614562A1
公开(公告)日:1997-03-25
Organoselenones of the formula R.sub.1 --Se(O.sub.2)--(CH.sub.2).sub.n --X wherein R.sub.1 is selected from the group consisting of aryl, vinyl, acetylenyl, and aralkyl, n is an integer equal to 2 to 6 and X is a leaving group selected from the group consisting of halides, sulfonates and selenones; were surprisingly found to be useful as alkylating agents which possessed a high degree of selectivity for nitrogen nucleophiles without the usual increased preference for sulfur nucleophiles. This property allows the effective use of these compounds as anti-cancer alkylating agents suitable for use in drug-resistant cell lines which display either thiol mediated drug resistance or MER(+)-mediated drug resistance. Two methods of synthesizing these compounds are also provided.