{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:60124"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:60124","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Methods for the synthesis of linear dialkylaromatic compounds by the use of heterogeneous catalysts","abstract":"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.","abstract_html":"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. 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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."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University 122 S. : graph. Darst. (2001). = Aachen, Techn. Hochsch., Diss., 2001"]},{"key":"dc:title","label":"Title","values":["Methods for the synthesis of linear dialkylaromatic compounds by the use of heterogeneous catalysts"]}]}],"canonical_facts":{"dc:contributor":["Hölderich, Wolfgang F."],"dc:coverage":["DE"],"dc:creator":["Roberge, Dominique"],"dc:date":["2001"],"dc:description":["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. 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