Specific acid catalysis and Lewis acid catalysis of Diels–Alder reactions in aqueous media
作者:Egid B. Mubofu、Jan B. F. N. Engberts
DOI:10.1002/poc.711
日期:2004.3
conditions, the reaction rate for 1a with 2 is about 40 times faster with copper catalysis than with specific acid catalysis. Moreover, at 32°C and 0.01 M HCl, the reaction of 1b with 2 is about 21 times faster than the same uncatalyzedreaction in purewater under the same reaction conditions. The inverse solvent kinetic isotope effect shows that these Diels–Alder reactions undergo specific acid catalysis
Surfactant-assisted specific-acid catalysis of Diels–Alder reactions in aqueous media
作者:Egid B. Mubofu、Jan B.F.N. Engberts
DOI:10.1002/poc.1240
日期:2007.10
with cyclopentadiene 2 in aqueous media at 32 °C was studied. This study showed that acidified anionic surfactants (pH 2) such as sodium dodecyl sulfate (SDS) and linear alkylbenzene sulfonicacid (LAS) accelerate Diels—Alder reactions. Conversely, under similar reaction conditions (pH 2) these reactions are inhibited by (acidified) cationic surfactants such as dodecyltrimethylammonium bromide (DTAB),