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Article: Ligand effect on ethylene trimerisation with [NNN]-heteroscorpionate pyrazolyl Cr(III) catalysts

TitleLigand effect on ethylene trimerisation with [NNN]-heteroscorpionate pyrazolyl Cr(III) catalysts
Authors
Issue Date2009
Citation
Dalton Transactions, 2009, n. 42, p. 9327-9333 How to Cite?
AbstractCr(III) complexes with [NNN]-heteroscorpionate pyrazolyl ligands of the type Pz'2CHX (Pz' = pyrazol-l-yl (Pz), or 3,5-dimethylpyrazol-1-yl (PzMe); X = N-containing heterocyclic ring or amine CH 2NR1R2; R1, R2 = H or alkyl) have been prepared. Upon activation with MAO, they are active for selective ethylene trimerisation to 1-hexene. The effects of the hetero-functional group and chelate ring size on the catalytic performance have been examined. The pre-catalysts with an N-heterocycle substituent show highest activity [32400-53000 g/(g Cr h-1)] and total C6 selectivities (>97.6%) as well as 1-hexene selectivity (>96.0%) among hexenes. The X-ray single-crystal crystallographic analysis of CrCl 3[PzMe 2CH2NCH2Ph] and CrCl3[PzMe 2CH2NCH2Fc] (Fc = ferrocenyl) shows a tridentate coordination on the fac-octahedral Cr(III) sphere with the Cr-N bond length dependent on the N-substituent. © 2009 The Royal Society of Chemistry.
Persistent Identifierhttp://hdl.handle.net/10722/219611
ISSN
2015 Impact Factor: 4.177
2015 SCImago Journal Rankings: 1.404

 

DC FieldValueLanguage
dc.contributor.authorZhang, Jun-
dc.contributor.authorLi, Aifang-
dc.contributor.authorHor, T. S Andy-
dc.date.accessioned2015-09-23T02:57:31Z-
dc.date.available2015-09-23T02:57:31Z-
dc.date.issued2009-
dc.identifier.citationDalton Transactions, 2009, n. 42, p. 9327-9333-
dc.identifier.issn1477-9226-
dc.identifier.urihttp://hdl.handle.net/10722/219611-
dc.description.abstractCr(III) complexes with [NNN]-heteroscorpionate pyrazolyl ligands of the type Pz'2CHX (Pz' = pyrazol-l-yl (Pz), or 3,5-dimethylpyrazol-1-yl (PzMe); X = N-containing heterocyclic ring or amine CH 2NR1R2; R1, R2 = H or alkyl) have been prepared. Upon activation with MAO, they are active for selective ethylene trimerisation to 1-hexene. The effects of the hetero-functional group and chelate ring size on the catalytic performance have been examined. The pre-catalysts with an N-heterocycle substituent show highest activity [32400-53000 g/(g Cr h-1)] and total C6 selectivities (>97.6%) as well as 1-hexene selectivity (>96.0%) among hexenes. The X-ray single-crystal crystallographic analysis of CrCl 3[PzMe 2CH2NCH2Ph] and CrCl3[PzMe 2CH2NCH2Fc] (Fc = ferrocenyl) shows a tridentate coordination on the fac-octahedral Cr(III) sphere with the Cr-N bond length dependent on the N-substituent. © 2009 The Royal Society of Chemistry.-
dc.languageeng-
dc.relation.ispartofDalton Transactions-
dc.titleLigand effect on ethylene trimerisation with [NNN]-heteroscorpionate pyrazolyl Cr(III) catalysts-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1039/b909685j-
dc.identifier.scopuseid_2-s2.0-70350218975-
dc.identifier.issue42-
dc.identifier.spage9327-
dc.identifier.epage9333-
dc.identifier.eissn1477-9234-

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