由硫醇R F CH合成式R F CH 2 CH 2 SO 2 H(2,其中R F = n -C 6 F 13或n- C 8 F 17)的2-(全氟烷基)乙亚磺酸2 CH 2 SH(1)。这些链状酸2具有陡峭的熔点(mp)并且可以重结晶。C6或C8全氟烷基赋予酸2及其衍生物不寻常的“亲液”性能。酸的水溶液2以及它们的Na,K,Cs和Bu 4 N盐具有很高的表面活性,并且可以保持几天稳定,并且比正全氟辛烷磺酸钠(10)更有效地降低了空气/水界面的表面张力。钠盐2(C6,C8)通过复分解以高收率转化为K和Cs盐。但是,最好在双相体系中制备2的两亲性Bu 4 N盐(C6,C8)(C6,产率为99.6%)。酸2通过三种方法合成。(1)C8硫醇氧化1通过(在-35℃)米-CPBA得到酸2(C8)以73%的产率和不想要的二硫化物(3),收率为27%。庞大的强电负性R F基团1可以减慢RSOH(中间体
Fluoride ion-catalyzed conjugate addition for easy synthesis of 3-sulfanylpropionic acid from thiol and α,β-unsaturated carboxylic acid
摘要:
3-Sulfanylpropionic acids are obtained in excellent yields by proceeding through a simple, mild, and efficient procedure utilizing tetrabutylammonium fluoride (TBAF) as catalyst. (C) 2007 Published by Elsevier Ltd.
Fluoride ion-catalyzed conjugate addition for easy synthesis of 3-sulfanylpropionic acid from thiol and α,β-unsaturated carboxylic acid
作者:Shijay Gao、Chi Tseng、Cheng Hsuan Tsai、Ching-Fa Yao
DOI:10.1016/j.tet.2007.11.064
日期:2008.2
3-Sulfanylpropionic acids are obtained in excellent yields by proceeding through a simple, mild, and efficient procedure utilizing tetrabutylammonium fluoride (TBAF) as catalyst. (C) 2007 Published by Elsevier Ltd.
Preparation, reactions and physical properties of segmented 2-(perfluoroalkyl)ethanesulfinic acids and their derivatives. The role of the perfluoroalkyl group in finding new and useful compounds and in searching out new chemistry
作者:Neal O. Brace
DOI:10.1016/s0022-1139(99)00239-0
日期:2000.3
2-(Perfluoroalkyl)ethanesulfinic acids of the formula RFCH2CH2SO2H (2, where RF = n-C6F13, or n-C8F17) are synthesized from the thiol, RFCH2CH2SH (1). These segmented acids 2 have sharp melting point (mp) and can be recrystallized. The C6 or C8 perfluoroalkyl group confers unusual “fluophilic” properties to acids 2 and their derivatives. Water solutions of acids 2 and their Na, K, Cs and Bu4N salts
由硫醇R F CH合成式R F CH 2 CH 2 SO 2 H(2,其中R F = n -C 6 F 13或n- C 8 F 17)的2-(全氟烷基)乙亚磺酸2 CH 2 SH(1)。这些链状酸2具有陡峭的熔点(mp)并且可以重结晶。C6或C8全氟烷基赋予酸2及其衍生物不寻常的“亲液”性能。酸的水溶液2以及它们的Na,K,Cs和Bu 4 N盐具有很高的表面活性,并且可以保持几天稳定,并且比正全氟辛烷磺酸钠(10)更有效地降低了空气/水界面的表面张力。钠盐2(C6,C8)通过复分解以高收率转化为K和Cs盐。但是,最好在双相体系中制备2的两亲性Bu 4 N盐(C6,C8)(C6,产率为99.6%)。酸2通过三种方法合成。(1)C8硫醇氧化1通过(在-35℃)米-CPBA得到酸2(C8)以73%的产率和不想要的二硫化物(3),收率为27%。庞大的强电负性R F基团1可以减慢RSOH(中间体