Hybrid surfactants containing separate hydrocarbon and fluorocarbon chains
摘要:
Two homologous series of double-tail hybrid surfactants containing a hydrocarbon chain and a fluorocarbon chain attached to the same hydrophilic head group have been synthesized. The micellar solutions of such hybrid surfactants have been studied by conductance, surface tension, F-19 NMR and H-1 NMR. The dependence of the cmc on the chain length follows Kleven's equation. The micellar aggregation numbers are 10-35 and become smaller as the chain length increases. When the hydrocarbon chain bears three carbons or more, both the fluorocarbon and the hydrocarbon chains are incorporated inside the micelle.
Hybrid surfactants containing separate hydrocarbon and fluorocarbon chains
摘要:
Two homologous series of double-tail hybrid surfactants containing a hydrocarbon chain and a fluorocarbon chain attached to the same hydrophilic head group have been synthesized. The micellar solutions of such hybrid surfactants have been studied by conductance, surface tension, F-19 NMR and H-1 NMR. The dependence of the cmc on the chain length follows Kleven's equation. The micellar aggregation numbers are 10-35 and become smaller as the chain length increases. When the hydrocarbon chain bears three carbons or more, both the fluorocarbon and the hydrocarbon chains are incorporated inside the micelle.
The treatment of F-alkyl ketones with sodium diethyl phosphite in tetrahydrofuran at −10 to 0 °C gave high yields of 1-substituted F-1-alkenyl phosphates, which readily reacted with amidine or hydrazine derivatives at room temperature to afford the corresponding fluorinated pyrimidines or pyrazoles, respectively, in good to excellent yields.
在四氢呋喃中在 -10 至 0 °C 下用二乙基亚磷酸钠处理 F-烷基酮,得到高产率的 1-取代 F-1-烯基磷酸酯,其在室温下容易与脒或肼衍生物反应,得到相应的氟化物。嘧啶类或吡唑类,分别具有良好到极好的产率。
The Wittig reaction of perfluoro acid derivatives: access to fluorinated enol ethers, enamines, and ketones
作者:Jean Pierre Begue、Daniele Bonnet-Delpon、Dany Mesureur、Gerard Nee、Sheng Wen Wu
DOI:10.1021/jo00040a017
日期:1992.7
The preparation of novel perfluoroalkyl-substituted compounds in good yields is described. This preparation involves the Wittig reaction of a phosphonium ylide with perfluoroalkyl acid derivatives. The influence of the structure of the starting alkylidenetriphenylphosphoranes, the perfluoroalkyl reagents, and the reaction conditions has been investigated. Trifluoroacetamides lead to a Z/E mixture of enamines 3. Perfluoroalkyl esters (Rf = CF3, C2F5, C3F7, C7F15, CF2Cl) lead to only the (Z)-enol ethers 8-12 when reactions are performed with NaNH2 as a base and to 1-perfluoroalkyl ketones 13-17 when reactions are performed with BuLi.
ISHIHARA, TAKASHI;KUROBOSHI, MANABU, J. FLUOR. CHEM., 37,(1987) N 1, 113-118
作者:ISHIHARA, TAKASHI、KUROBOSHI, MANABU
DOI:——
日期:——
ISHIHARA, TAKASHI;OKADA, YOSHIJI;KUROBOSHI, MANABU;SHINOZAKI, TAKAO;ANDO,+, CHEM. LETT.,(1988) N 5, 819-822