Acid zeolites as catalysts in organic reactions. Chemoselective Friedel-Crafts alkylation of benzene and toluene with cinnamyl alcohol

✍ Scribed by Elvira Armengol; Avelino Corma; Hermenegildo García; Primo Jaime

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 600 KB
• Volume: 126
• Category: Article
• ISSN: 0926-860X
• DOI: 10.1016/0926-860x(95)00034-8

✦ Synopsis

Alkylation

of benzene and toluene with cinnamyl alcohol has been carried out in the presence of a series of acid Y faujasites with three levels of NaC-to-H' exchange (HY-21, HY-50 and HY-100) and with different framework Si-to-Al ratio (HY-Dl, HY-D2 and HY-D3). This system provides a good example of the possibilities of tunable acidity in zeolites to control a chemical reaction. Thus, while 1,3-diarylpropenes were the predominant reaction products using HY-21 and HY-50 catalysts, further reaction of the C=C double bond to give arylindanes and triarylpropanes takes place using the other more acidic catalysts. Finally, no detectable amounts of branched allylic isomer 3,3-d&y-1 -propene, generally also formed by attack at the three position of the cinnamyl alcohol, were observed.