An infrared investigation of the catalyst formation in the system Ni(acac)2, C3H4, (iBu)3AL for propadiene polymerization

J.G. van Ommen, H.J. van der Ploeg, P.C.J.M. van Berkel, P. Mars

Research output: Contribution to journalArticleAcademic

12 Citations (Scopus)
54 Downloads (Pure)

Abstract

The catalyst formation in the system Ni(acac)2, C3H4, (iBu)3Al was investigated by means of infrared spectroscopy. It was found that the Al(acac)3 and (iBu)2Al(acac) formed are both by-products of catalyst formation without a catalytic activity. Ni(acac)2 loses its acac groups forming the unstable (iBu)2Ni compound; without C3H4 being present, this compound disproportionates to Ni metal and isobutane and isobutene. In the presence of C3H4 an allyl-nickel complex is formed, which reacts with (iBu)3Al to give the actual catalyst, possibly a bimetallic allyl—nickel-aluminium complex. Catalysts such as Ni(acac)2, C3H4, (iBu)3Al and (πC3H5)2Ni with or without (iBu)3Al all selectively give 1, 2, 1, 2-polypropadiene. A Lewis base like pyridine not only decreases the polymerization rate but also changes the selectivity towards the formation of 1, 2, 2, 1-polymer.
Original languageUndefined
Pages (from-to)409-420
JournalJournal of molecular catalysis
Volume2
Issue number6
DOIs
Publication statusPublished - 1977

Keywords

  • IR-68377

Cite this

van Ommen, J.G. ; van der Ploeg, H.J. ; van Berkel, P.C.J.M. ; Mars, P. / An infrared investigation of the catalyst formation in the system Ni(acac)2, C3H4, (iBu)3AL for propadiene polymerization. In: Journal of molecular catalysis. 1977 ; Vol. 2, No. 6. pp. 409-420.
@article{6e42184551ae4ca6bf6c8c84dc9b5504,
title = "An infrared investigation of the catalyst formation in the system Ni(acac)2, C3H4, (iBu)3AL for propadiene polymerization",
abstract = "The catalyst formation in the system Ni(acac)2, C3H4, (iBu)3Al was investigated by means of infrared spectroscopy. It was found that the Al(acac)3 and (iBu)2Al(acac) formed are both by-products of catalyst formation without a catalytic activity. Ni(acac)2 loses its acac groups forming the unstable (iBu)2Ni compound; without C3H4 being present, this compound disproportionates to Ni metal and isobutane and isobutene. In the presence of C3H4 an allyl-nickel complex is formed, which reacts with (iBu)3Al to give the actual catalyst, possibly a bimetallic allyl—nickel-aluminium complex. Catalysts such as Ni(acac)2, C3H4, (iBu)3Al and (πC3H5)2Ni with or without (iBu)3Al all selectively give 1, 2, 1, 2-polypropadiene. A Lewis base like pyridine not only decreases the polymerization rate but also changes the selectivity towards the formation of 1, 2, 2, 1-polymer.",
keywords = "IR-68377",
author = "{van Ommen}, J.G. and {van der Ploeg}, H.J. and {van Berkel}, P.C.J.M. and P. Mars",
year = "1977",
doi = "10.1016/0304-5102(77)80012-6",
language = "Undefined",
volume = "2",
pages = "409--420",
journal = "Journal of molecular catalysis",
issn = "0304-5102",
publisher = "Elsevier",
number = "6",

}

An infrared investigation of the catalyst formation in the system Ni(acac)2, C3H4, (iBu)3AL for propadiene polymerization. / van Ommen, J.G.; van der Ploeg, H.J.; van Berkel, P.C.J.M.; Mars, P.

In: Journal of molecular catalysis, Vol. 2, No. 6, 1977, p. 409-420.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - An infrared investigation of the catalyst formation in the system Ni(acac)2, C3H4, (iBu)3AL for propadiene polymerization

AU - van Ommen, J.G.

AU - van der Ploeg, H.J.

AU - van Berkel, P.C.J.M.

AU - Mars, P.

PY - 1977

Y1 - 1977

N2 - The catalyst formation in the system Ni(acac)2, C3H4, (iBu)3Al was investigated by means of infrared spectroscopy. It was found that the Al(acac)3 and (iBu)2Al(acac) formed are both by-products of catalyst formation without a catalytic activity. Ni(acac)2 loses its acac groups forming the unstable (iBu)2Ni compound; without C3H4 being present, this compound disproportionates to Ni metal and isobutane and isobutene. In the presence of C3H4 an allyl-nickel complex is formed, which reacts with (iBu)3Al to give the actual catalyst, possibly a bimetallic allyl—nickel-aluminium complex. Catalysts such as Ni(acac)2, C3H4, (iBu)3Al and (πC3H5)2Ni with or without (iBu)3Al all selectively give 1, 2, 1, 2-polypropadiene. A Lewis base like pyridine not only decreases the polymerization rate but also changes the selectivity towards the formation of 1, 2, 2, 1-polymer.

AB - The catalyst formation in the system Ni(acac)2, C3H4, (iBu)3Al was investigated by means of infrared spectroscopy. It was found that the Al(acac)3 and (iBu)2Al(acac) formed are both by-products of catalyst formation without a catalytic activity. Ni(acac)2 loses its acac groups forming the unstable (iBu)2Ni compound; without C3H4 being present, this compound disproportionates to Ni metal and isobutane and isobutene. In the presence of C3H4 an allyl-nickel complex is formed, which reacts with (iBu)3Al to give the actual catalyst, possibly a bimetallic allyl—nickel-aluminium complex. Catalysts such as Ni(acac)2, C3H4, (iBu)3Al and (πC3H5)2Ni with or without (iBu)3Al all selectively give 1, 2, 1, 2-polypropadiene. A Lewis base like pyridine not only decreases the polymerization rate but also changes the selectivity towards the formation of 1, 2, 2, 1-polymer.

KW - IR-68377

U2 - 10.1016/0304-5102(77)80012-6

DO - 10.1016/0304-5102(77)80012-6

M3 - Article

VL - 2

SP - 409

EP - 420

JO - Journal of molecular catalysis

JF - Journal of molecular catalysis

SN - 0304-5102

IS - 6

ER -