197798-18-8Relevant articles and documents
Evaluation of Bis(phosphine) Ligands for Ethylene Oligomerization: Discovery of Alkyl Phosphines as Effective Ligands for Ethylene Tri- And Tetramerization
Boelter, Scott D.,Davies, Dan R.,Milbrandt, Kara A.,Wilson, David R.,Wiltzius, Molly,Rosen, Mari S.,Klosin, Jerzy
, p. 967 - 975 (2020/02/28)
Fifty-three bis(phosphines) were evaluated as ligands for chromium-catalyzed ethylene tetramerization in a high-throughput reactor. Selected ligands previously reported in the literature gave high activities with expected selectivities when evaluated under our reactor conditions. While the majority of ligands evaluated gave low activity catalysts that produced mostly high-density polyethylene (HDPE), alkyl phosphines were unexpectedly identified as a promising ligand class. In particular, the MeDuPhos ligand led to an active catalyst that produced 81.8 wt % α-olefins (50.0 wt % 1-octene, 31.8 wt % 1-hexene) and 3.5 wt % HDPE, approaching the selectivity of the state-of-the-art i-Pr-PNP ligand.
POLYMERISATION PROCESS CATALYSED BY A BIDENTATE BISPHOSPHINE-GROUP VIII METAL COMPLEX
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Page/Page column 10, (2010/11/27)
A process for the polymerization and copolymerization of olefins is disclosed, comprising contacting the monomeric olefin under polymerization conditions with a polymerization catalyst or catalyst system which comprises (a) a source of a Group VIII metal; (b) a bidentate phosphine ligand having the formula (R1)(R1)P-X-P(R1)(R1), where each R1 is independently selected from a phenyl group or a substitued phenyl group with the proviso that at least one of the R1 groups is a phenyl group having at least one ortho substituent, and X is a bridging group of the structure -[N]x-[P]y-[N]- where x and y are independently 0 or 1, or -C(R4)2- where R4 may be the same or different and is hydrogen or a monovavlent hydrocarbyl, substituted hydrocarbyl or hetero-hydrocarbyl group; and optionally (c) a promoter.
CATALYTIC PROCESS FOR THE OLIGOMERIZATION OF OLEFINIC MONOMERS
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Page/Page column 38-39, (2010/11/27)
A process for the simultaneous trimerization and tetramerization of olefinic monomers , wherein the process comprises contacting at least one olefinic monomer with catalyst system comprising : a) a source of chromium, molybdenum or tungsten; b) a ligand having the general formula (I) ; (R1)2P-X-P (R1)m(R2)n wherein : X is a bridging group of the formula -N(R3)-, wherein R3 is selected from hydrogen, a hydrocarbyl group, a substituted hydrocarbyl group, a heterohydrocarbyl group, a substituted heterohydrocarbyl group, a silyl group or derivative thereof; the R1 groups are independently selected from an optionally substituted aromatic group bearing a polar substituent on at least one of the ortho-positions; and the R2 groups are independently selected from hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl and substituted heterohydrocarbyl groups and c) a cocatalyst, at a pressure in the range of from below atmospheric to about 40 barg and at a temperature in the range of from about 0 °C to about 120 °C. The present invention further relates to a process for the simultaneous trimerization and tetramerization of ethylene to 1-hexene and 1-octene.
