Sulfonated Diphenylphosphanes for Homogeneous Biphasic Catalysis via a Combined Protection/Deprotection Protocol
作者:Helge Jänsch、Sven Kannenberg、Gernot Boche
DOI:10.1002/1099-0690(200108)2001:15<2923::aid-ejoc2923>3.0.co;2-i
日期:2001.8
Oxidation of the sulfonated oxygen-labile alkyl- and benzyldiphenylphosphanes 3a-f during hydrolytic workup of the oleum-containing sulfonation mixture is prevented by "soft" hydrolysis with disodium oxalate or basic aluminum oxide. Furthermore, the use of a protection protocol allows for the synthesis of the air-stable sulfonated phosphanylborane adducts 6a-f for storage and purification purposes, Deprotection yields the corresponding sulfonated alkyl- and benzyldiphenylphosphanes 7a-f.