从长链合成了一系列新颖的三聚阴离子表面活性剂系列3C n TE3CNa(其中n是7、10或12的脂肪酸链长度),其中三个烃链和三个羧酸酯头通过三醚键连接。 α-溴代脂肪酸和三醇1,1,1-三(羟甲基)乙烷。将得到的三聚羧酸酯化并通过硅胶柱色谱法纯化,然后用稀氢氧化钠溶液水解以形成一系列三聚羧酸盐表面活性剂产物。所有制备的化合物均经过IR,1 H NMR和13分析13 C NMR光谱证实其化学结构。研究了它们的表面活性。图3C的临界胶束浓度(CMC)ñ TE3CNa均的0.12-0.71毫摩尔/ L的范围内,和在CMC中的表面张力(γ CMC)为29.3-34.8 mN / m的。
从长链合成了一系列新颖的三聚阴离子表面活性剂系列3C n TE3CNa(其中n是7、10或12的脂肪酸链长度),其中三个烃链和三个羧酸酯头通过三醚键连接。 α-溴代脂肪酸和三醇1,1,1-三(羟甲基)乙烷。将得到的三聚羧酸酯化并通过硅胶柱色谱法纯化,然后用稀氢氧化钠溶液水解以形成一系列三聚羧酸盐表面活性剂产物。所有制备的化合物均经过IR,1 H NMR和13分析13 C NMR光谱证实其化学结构。研究了它们的表面活性。图3C的临界胶束浓度(CMC)ñ TE3CNa均的0.12-0.71毫摩尔/ L的范围内,和在CMC中的表面张力(γ CMC)为29.3-34.8 mN / m的。
Influence of palladium(II) complexes on the cycloaddition of α-bromoalkyl ketenes to cyclopentadiene
作者:Ian J.S Fairlamb、Julia M Dickinson、Ileana M Cristea
DOI:10.1016/s0040-4020(01)00092-8
日期:2001.3
Palladium(II) complexes, of the type PdL2X2 and PdX2, influence both the yields and endo/exo ratio in formation of several 7-bromo-7-alkylbicyclo[3.2.0]hept-2-en-6-ones. Standard dehydrochlorination of α-bromoacyl chlorides with triethylamine in the presence of cyclopentadiene and palladium catalyst promotes the formation of the exo cycloadducts, which is accompanied by an improvement in the yields
PdL 2 X 2和PdX 2类型的钯(II)配合物会影响几种7-溴-7-烷基双环[3.2.0] hept-2-en-6-的形成中的收率和内/外比。那些。在环戊二烯和钯催化剂的存在下的三乙胺α-bromoacyl氯化物的标准脱氯化氢促进形成外cycloadducts,这是伴随着产率两者的改善内切和外切cycloadducts。讨论了钯介导的环加成反应的机理。
Palladium-catalysed [π2a+π2s] cycloadditions of α-bromoalkyl ketenes to cyclopentadiene
作者:Ian J.S Fairlamb、Julia M Dickinson、Ileana M Cristea
DOI:10.1016/s0040-4039(00)00478-0
日期:2000.5
7-Substituted bicyclo[3.2.0]hept-2-en-6-one derivatives were identified as intermediates towards biologically interesting compounds. An improved synthesis of 7-alkyl-7-bromobicyclo[3.2.0]hept-2-en-6-ones by palladium-catalysed [π2a+π2s] cycloaddition of α-bromoalkyl ketenes to cyclopentadiene is described. Increased yields and increasing exo alkyl cycloadducts were observed with various palladium catalysts
carboxylic acidesters and (b) fatty alcohol and carbohydrate phosphate esters, were synthesized and evaluated in vitro against Cryptococcus neoformans, Candida albicans, and Aspergillus niger. All carboxylic acidester derivatives of fluconazole (1a-l), such as O-2-bromooctanoylfluconazole (1g, MIC=111 microg/mL) and O-11-bromoundecanoylfluconazole (1j, MIC=198 microg/mL), exhibited higher antifungal activity
Saturated hydroxy fattyacids make up a class of underexplored lipids with potentially interesting biological activities. We report a succinct and general synthetic route to saturated hydroxy fattyacids hydroxylated at position 6 or higher, and exemplify this with the synthesis of hydroxylauric acids. All regioisomers of hydroxylauric acids were tested on free fattyacid receptors FFA1, FFA4 and GPR84
Preparation of unsymmetrical halogen-substituted diacyl peroxides
申请人:Union Carbide Corporation
公开号:US03936506A1
公开(公告)日:1976-02-03
Unsymmetrical halogen-substituted diacyl peroxides have been prepared either by rapidly adding an .alpha.-halogen-substituted aliphatic acyl halide and a hydrocarbon solvent to an aqueous solution of an alkali metal peroxide followed by portion-wise addition of an acyl halide or by rapidly adding an acyl halide and a hydrocarbon solvent to an aqueous solution of an alkali metal peroxide followed by portion-wise addition of an .alpha.-halogen-substituted aliphatic acyl halide. The formation of diacyl peroxides and symmetrical halogenated diacyl peroxides as by-products is minimized by either technique.