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Published November 2013 | Supplemental Material + Accepted Version
Journal Article Open

Spectral Studies of a Cr(PNP)−MAO System for Selective Ethylene Trimerization Catalysis: Searching for the Active Species


Variable temperature spectroscopic, kinetic, and chemical studies were performed on a soluble Cr^(III)Cl_3(PNP) (PNP = bis(diarylphosphino)alkylamine) ethylene trimerization precatalyst to map out its methylaluminoxane (MAO) activation sequence. These studies indicate that treatment of Cr^(III)Cl_3(PNP) with MAO leads first to replacement of chlorides with alkyl groups, followed by alkyl abstraction, and then reduction to lower–valent species. Reactivity studies demonstrate that the majority of the chromium species detected are not catalytically active.

Additional Information

© 2013 American Chemical Society. Received: September 4, 2013. Revised: October 4, 2013. Publication Date (Web): October 7, 2013. This work was supported by BP. L.H.D. acknowledges the National Institute of General Medical Sciences for a postdoctoral fellowship (F32 GM099189-02). The authors thank Angelo DiBilio for assistance with EPR measurements and David Leitch and Aaron Sattler for helpful discussions. The authors declare no competing financial interest.

Attached Files

Accepted Version - nihms531708.pdf

Supplemental Material - cs400778a_si_001.pdf


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