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Catalyst development for the selective methylation of catechol

✍ Scribed by S. Porchet; L. Kiwi-Minsker; R. Doepper; A. Renken

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
322 KB
Volume
51
Category
Article
ISSN
0009-2509

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✦ Synopsis

Gas-phase alkylation of catechol with methanol on T-alumina and modified "t-alumina catalysts is studied experimentally. By limiting the conversion to X < 0.3, the formation of polymethylated species can be avoided and only the three isomers guaiacol, 3-methylcatechol and 4-methylcatechol are observed. Optimising the catalyst composition and the reaction conditions, a selectivity of 0.75 for the industrially most valuable product 3-methylcatechol can be obtained.

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The methylenedioxy group occurs in m8ny natural products' and, in addition, has been suggested 8s a protecting group for catechols\*. However, synthetically, the methylenation of catechols [FIG l] h 8s never been easy and high yields difficult to obtain 3 .