LASZLO Clay Catalyst

Cornelius, A., and P. Laszlo, Clay Supported Reagents II. Quaternary Ammonium Exchanged Montmorillonite as Catalyst in the Phase Transfer Preparation of Symmetric Formaldehyde Acetals, Synthesis, 162 (1982). 

Montmorillonite clays are layered silicates montmorillonite K-10 is a specially manufactured acidic catalyst (Montmorillonite K10, [1318-93-0] A. Comelis, P. Laszlo, M. W. Zettler in eEROS Encyclopedia of Reagents for Organic Synthesis, L. A. Paquette, Ed., John Wiley and Sons, Inc., online reference available at http //www.intersciene.wiley.com)... 

Clay minerals or rocks are used as catalysts in both natural and chemically modified forms. Their very first application dates back to the 1960s when acid-treated clays were used for cracking in oil industry (Franz et al. 1959). In the last decades, several reviews have been published on the catalytic effects of clay minerals (Theng 1974, 1982 Solomon and Hawthorne 1983 Laszlo 1986a, 1986b Adams 1987 McCabe 1996 Adams 1987 Adams and McCabe 2008). 

Laszlo and coworkers [13] developed a one-pot nitration method based on the use of claycop , cupric nitrate-impregnated acidic montmorillonite clay K-10. Nitration was conducted in the liquid phase under Menke conditions in the presence of acetic anhydride as water-trapping agent regioselectivity was high for p-NT. In a further development, the one-pot polynitration of mainly activated aromatic compounds and in particular toluene was examined using the same catalyst... 

Cornelis, A., Gerstmans, A., Laszlo, R, Mathy, A., and Zieba, 1.1990. Friedel-Crafts acylations with modified clays as catalysts. Chem. Lett. 6 103-109. 

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