basis of data obtained, an octahedral structure was assigned for all of the complexes. The chalcone thiosemicarbazones behave as dianionic tridentate O, N, S donors and coordinate to ruthenium via the phenolic oxygen of chalcone, the imine nitrogen of thiosemicarbazone and thienol sulfur. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols to their corresponding
一系列新的 [Ru(CO)(EPh3)(B)(L)] 型六配位钌 (II) 配合物(E = P 或 As;B = PPh3、AsPh3 或 Py;L = 查尔酮缩氨基硫脲) [RuHCl(CO)(EPh3)2(B)](E = P 或 As;B = PPh3、AsPh3 或 Py)与查尔酮缩氨基硫脲在回流下在苯中反应制备。新配合物已通过分析和光谱(IR、UV-vis、1H、31P 和 13C NMR)方法进行表征。根据获得的数据,为所有配合物指定了八面体结构。查尔酮缩氨基硫脲作为双阴离子三齿 O、N、S 供体,并通过查耳酮的酚氧、缩氨基硫脲的亚胺氮和噻吩硫与钌配位。
Ruthenium(II) carbonyl complexes containing chalconates and triphenylphosphine/arsine
作者:P VISWANATHAMURTHI、M MUTHUKUMAR
DOI:10.1007/s12039-011-0125-0
日期:2011.9
A series of new hexa-coordinated ruthenium(II) carbonyl complexes of the type [RuCl(CO)(EPh3)(B)(L1 − 4)] (4–15) (E = P or As; B = PPh3, AsPh3 or Py; L = 2′-hydroxychalcone) were synthesized from the reaction of [RuHCl(CO)(EPh3)2(B)] (1–3) (E = P or As; B = PPh3, AsPh3 or Py) with equimolar chalcone in benzene under reflux. The new complexes have been characterized by analytical and spectroscopic (IR
[RuCl(CO)(EPh 3)(B)(L 1-4)]类型的一系列新的六配位钌(II)羰基络合物(4–15)(E = P或As; B = PPh 3,由[RuHCl(CO)(EPh 3)2(B)](1-3)(E = P或As; B = PPh 3)反应合成了AsPh 3或Py; L = 2'-羟基查耳酮,AsPh 3或Py)与等摩尔查尔酮在苯中回流。新配合物的特征在于分析和光谱(IR,电子,1 H,31 P 1 H}和13NMR)方法。根据获得的数据,为所有配合物分配了八面体结构。在作为共氧化剂的N-甲基吗啉-N-氧化物(NMO)的存在下,该配合物具有将伯醇和仲醇氧化为相应的醛和酮的催化活性,也被发现是有效的转移加氢催化剂。配体及其配合物的抗真菌性能也已被检验,并与标准的Bavistin进行了比较。 合成并表征了稳定的钌(II)钌酸盐配合物。为所有配合物分配了八面体结构。发现新的络合物是有效的氧化和转移氢化催化剂。
Synthesis of 3-HCF<sub>2</sub>S-Chromones through Tandem Oxa-Michael Addition and Oxidative Difluoromethylthiolation
A simple protocol for the synthesis of difluoromethylthiolated chromen-4-ones using elemental sulfur and ClCF2CO2Na as the difluoromethylthiolating agent is described. Three-component reactions of 2'-hydroxychalcones, ClCF2CO2Na, and sulfur under basic conditions using TEMPO as the oxidant afforded HCF2S-containing 4H-chromen-4-one and 9H-thieno[3,2-b]chromen-9-one derivatives in good yield. The protocol
considerably explored. In recent years, substitutedsynthetic flavonoids have been dragging continuous attention due to their broad range of biological activities. Flavonoids are very well know and documented to possess antioxidant effects, antiviral and leishmanicidal activity, Certain 4-Iminoflavones Derivatives: Synthesis, Docking Studies, Antiasthmatic and Antimicrobial Agents
Membrane-stabilizing and antioxidant activities of twenty six pyrazoline and hydrazone derivatives were investigated. Antioxidant activity of these compounds was examined by using in vitro 2,2-azino-bis(3-ethyl-benzothiazoline-6-sulphonic acid) (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assays. Butylated hydroxytoluene (BHT) was used as DPPH• free radical scavenger standard, and trolox was used as ABTS•+ free radical scavenger standard. Some compounds (D13, D16 and D22) showed good antioxidant activity. All compounds were found to exhibit better membrane stabilizing activity than the reference acetylsalicylic acid.