Methods for the synthesis of linear dialkylaromatic compounds by the use of heterogeneous catalysts

The objective of this work is to discover new heterogeneous catalysts for the production of linear dialkylaromatic compounds such as 4,4'-dimethylbiphenyl, 4,4'diisopropylbiphenyl, 2,6-diisopropylnaphthalene and p-cymene. Essentially this work studies three different catalytic methods. The first method is concerned with the dehydrogenation of naturally occurring terpenes (e.g. pinenes) to the more commercially valuable p-cymene. The reaction is a good example of catalyst dual-functionality, where acidic and metallic sites are both required to obtain good yields. The second reaction deals with the alkylation of biphenyl and naphthalene with propylene, to shape selectively synthesize 4,4'-diisopropylbiphenyl and 2,6-diisopropylnaphthalene. It is demonstrated that zeolite beta is an intrinsic shape-selective catalyst for this type of alkylation. Finally, the third reaction uses the classical Ullmann reaction catalyticaly, and couples two p-chlorotoluene molecules to form 4,4'-dimethylbiphenyl. This catalytic reaction under reducing conditions with hydrogen and one single liquid phase, is a novel process. However the yield remains low.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2001

Author dc:creator

• Roberge, Dominique

Contributors dc:contributor

• Hölderich, Wolfgang F.

• info:eu-repo/classification/ddc/540
• Chemie
• Aromatische Verbindungen
• Alkylgruppe
• Linearmolekül
• Chemische Synthese
• Heterogene Katalyse

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121850%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:60124