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Olefin trimerization with titanium catalysts: MAO/silica-supported variants display higher productivities

Bercaw, John E. and Aluthge, Dinesh and Sattler, Aaron and Labinger, Jay A. (2017) Olefin trimerization with titanium catalysts: MAO/silica-supported variants display higher productivities. In: 253rd American Chemical Society National Meeting & Exposition, April 2-6, 2017, San Francisco, CA.

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Treatment of dry silica with methylaluminoxane (MAO) followed by (FI)TiCl_3 (FI = (N-(5-methyl-3-(1- adamantyl)salicylidene)-2'-(2"-methoxyphenyl)anilinato), gives a heterogeneous supported ethylene trimerization catalyst, s(FI)Ti, which exhibits productivity more than an order of magnitude higher than its homogeneous analogs. This increase is attributed to a decreased rate of catalyst decompn. via comproportionation to an inactive Ti(III) species, which is retarded by immobilization. In addn., s(FI)Ti catalyzes trimerization α-olefins with high selectivity. Based on regioisomer distributions, catalysis by s(FI)Ti involves the same active species as the previously reported homogeneous systems (FI)TiR_2Me/B(C_6F_5)_3(R = Me, CH_2SiMe_3, CH_2CMe_3). Co-supporting the (FI)TiCl_3 catalyst with the ethylene polymn. catalyst (CpSiNR)TiCl_2 (CpSiNR = (C_5Me_4)SiMe_2NCMe_3), either on sep. or the same silica particles, affords a catalyst system for producing butyl-branched LLDPE from and ethylene-only feed.

Item Type:Conference or Workshop Item (Paper)
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Labinger, Jay A.0000-0002-1942-9232
Additional Information:© 2017 American Chemical Society.
Record Number:CaltechAUTHORS:20170503-093030667
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77141
Deposited By: Tony Diaz
Deposited On:03 May 2017 18:16
Last Modified:03 Oct 2019 17:53

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