Asymmetric Bis(formamidinate) Group 4 Complexes: Synthesis, Structure and Their Reactivity in the Polymerization of alpha-Olefins.

Naveen V. Kulkarni; Tatyana Elkin; Boris Tumaniskii; Mark Botoshansky; Linda J. W. Shimon; Moris S. Eisen

doi:10.1021/om500345r

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Asymmetric Bis(formamidinate) Group 4 Complexes: Synthesis, Structure and Their Reactivity in the Polymerization of alpha-Olefins.

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Asymmetric Bis(formamidinate) Group 4 Complexes: Synthesis, Structure and Their Reactivity in the Polymerization of alpha-Olefins.

Naveen V. Kulkarni, Tatyana Elkin, Boris Tumaniskii, Mark Botoshansky, Linda J. W. Shimon and Moris S. Eisen

Organometallics, Vol.33(12), pp.3119-3136

Jun/2014

DOI: https://doi.org/10.1021/om500345r

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Abstract

A series of asymmetric formamidine ligands bearing different substituents with various steric and electronic properties on the nitrogen of the N-C-N motif were synthesized. Group 4 bis(formamidinate) dimethylamido, chloride, and benzyl complexes were studied using these asymmetric ligands and their solid-state structures and their behavior in solution were determined. These complexes were activated with MAO (methylalumoxane) or a combination of cocatalysts and tested in the polymerization of ethylene and propylene. A noticeable influence of the formamidine nitrogen substituents on the activity of the catalyst and properties of the obtained polymers was observed. Further, a plausible mechanism for the polymerization of propylene is presented derived from a combination of ESR-C-60 and MALDI-TOF trapping experiments which shed light on the nature of the active catalytic species.

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Title: Asymmetric Bis(formamidinate) Group 4 Complexes; Synthesis, Structure and Their Reactivity in the Polymerization of alpha-Olefins.
Creators: Naveen V. Kulkarni (null)
Tatyana Elkin (null)
Boris Tumaniskii (null)
Mark Botoshansky (null)
Linda J. W. Shimon (null) - 972WIS_INST___100
Moris S. Eisen (null)
Resource Type: Journal article
Publication Details: Organometallics, Vol.33(12), pp.3119-3136; Jun/2014
Number of pages: 18
Language: English
DOI: https://doi.org/10.1021/om500345r
Grant note: USA-Israel Binational Science Foundation [2010109]; Center for Absorption in Science, Ministry of Immigrant Absorption, State of IsraelThis research was supported by the USA-Israel Binational Science Foundation under Contract 2010109. B.T. is grateful for support from the Center for Absorption in Science, Ministry of Immigrant Absorption, State of Israel._ALMAME_DELIMITER_
Record Identifier: 993266783903596

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