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MCM-41 type molecular sieves as catalysts for the Friedel-Crafts acylation of 2-methoxynaphthalene

✍ Scribed by Eric A. Gunnewegh; Saritha S. Gopie; Herman van Bekkum

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 660 KB
Volume: 106
Category: Article
ISSN: 1381-1169
DOI: 10.1016/1381-1169(95)00270-7

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✦ Synopsis

Molecular sieves of the MCM-41 type were studied as catalysts for the Friedel-Crafts acylation of 2-methoxynaphthalene in the liquid phase. When MCM-41 in the H+ form is used as Bronsted-acid catalyst, acylation with acetic anhydride gives substitution predominantly at the l-position. Increased reaction temperatures lead to a slight decrease of selectivity to acylation at the l-position.

The regenerability of H-MCM-41 is found to be excellent. For the acylation of 2methoxynaphthalene with acetyl chloride Zn-MCM-41 was studied as a Lewis-acid catalyst, but both selectivity and regenerability are less favourable than in the case of the H-MCM-41 catalysed acylation of with acid anhydride.

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