Mechanism of 1-acetyl-2-methoxynaphthalene isomerisation over a HBEA zeolite

被引:43
作者
Fromentin, E
Coustard, JM
Guisnet, M
机构
[1] Univ Poitiers, CNRS, UMR 6503, Fac Sci Fondamentales & Appl, F-86022 Poitiers, France
[2] Univ Poitiers, CNRS, UMR 6514, Fac Sci Fondamentales & Appliquees, F-86022 Poitiers, France
关键词
1-acetyl-2-methoxynaphthalene isomerisation; mechanisms; intramolecular and intermolecular; acetylation; HBEA zeolite;
D O I
10.1006/jcat.1999.2762
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Over HBEA, liquid phase acetylation of 2-methoxynaphthalene (2-MN) by acetic anhydride leads directly to 1-acetyl-2-methoxynaphthalene (I), to 2-acetyl-6-methoxynaphthalene (II), and to a small amount of 1-acetyl-7-methoxynaphthalene (III). At a long contact time, isomer I undergoes deacylation into 2-MN and isomerisation into II and III. Isomerisation of I is much faster in the presence of 2-MN than in its absence, which suggests that this reaction occurs through an intermolecular transacylation mechanism. The transformation of isomer I with a deuterated methoxy group (OCD3) in the presence of 2-MN shows that isomer II results only from this mechanism whereas an intramolecular mechanism participates also in the formation of isomer III. (C) 2000 Academic Press.
引用
收藏
页码:433 / 438
页数:6
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