A variety of organic reactions that are catalyzed by Bronsted
acids such as H2S04
, HCI, HN03
, AcOH, etc. or Lewis acids
such as AIC13
, TiCI4
, FeCI3
, etc. have been shown to take place in
clays, especially montmorillonite, more efficiently, i.e., under
milder conditions, with greater selectively, better yields, shorter
reaction times and so on. Moreover, the work up and purification
procedures are simpler as the catalyst is separated ea~ily from the
reaction mixture. Because of these reasons, and the fact that the
catalyst can be reused or regenerated,