Qualitative and quantitative characterization of a complex mixture of hexylbenzenes by 13C nuclear magnetic resonance and gas chromatography-mass spectrometry

Pooter, M. De; Klok, J.

doi:10.1007/bf00521006

Cited by 2 publications

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“…In addition, trace signals for PhMeCH are indicated by small signals at 22.7, 38.9, 40.5, and 148.3 ppm (Me, CH, CH 2 , i C; assignment cf . 2-phenylhexane, relative intensity by one-third higher than that of C1). Considering the usual preference of phosphinophenolate nickel catalysts for generation of isolated branches, the occurrence of SSS blocks and both end group signals suggests competing formation of linear polystyrene, by integration comprising ca.…”

Section: Resultsmentioning

confidence: 86%

“…0.2/total olefins) this corresponds to a similar content of styrene (9 wt % or 2.6 mol %). The E-PhCHdCHCH 2 end groups are indicated by conclusive proton signals at 6.57 (d, 15.9 Hz) and 6.36 ppm (dt, 15.9, 7.3 Hz), the CHPh branches by a quintet at 2.73 ppm, and the PhMeCHCH 2 group by a doublet at 1.39 (d,7.6 Hz) 24 relative intensity by one-third higher than that of C1). Considering the usual preference of phosphinophenolate nickel catalysts for generation of isolated branches, the occurrence of SSS blocks and both end group signals suggests competing formation of linear polystyrene, by integration comprising ca.…”

Section: Resultsmentioning

confidence: 99%

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2-Phosphinophenolate Nickel Catalysts: Formation of Ethylene Copolymers with Isolated sec-Alkyl, Aryl, and Functionally Substituted Alkyl Groups

et al. 2010

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The 2-phosphinophenolate nickel catalyzed oligo- or polymerization of ethylene in the presence of olefins usually leads to improved conversion or copolymerization. The outcome depends strongly on the nature of the P-substituents and olefins. The diphenylphosphinophenolate ligand (PPHH) favors improved yields of waxy linear ethylene oligomers, whereas the more P-basic dicyclohexylphosphinophenolate (CCHH) induces incorporation of alkyl-, aryl-, and ester-substituted α-olefins into a growing ethylene polymer chain and larger molar masses of the polymers. Depending on the nature of the olefin, the reaction rate and the conversion are lowered by olefin incorporation. Ester groups are tolerated if distant to the CC bond but block the catalyst if close to the olefinic group. A remarkable increase of activity accompanied by small branching was observed in the copolymerization with ethyl undecenoate by the nickel diphenylphosphinophenolate catalyst. 13C and 1H NMR spectra give evidence that ethylene copolymers with isolated side groups, imbedded into linear polyethylene blocks with vinyl end groups, are formed.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%