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Photosensitized, energy transfer-mediated organometallic catalysis through electronically excited nickel(II)

Welin, Eric and Le, Chip and Arias-Rotondo, Daniela and McCusker, James and MacMillan, David (2017) Photosensitized, energy transfer-mediated organometallic catalysis through electronically excited nickel(II). In: 254th American Chemical Society National Meeting & Exposition, August 20-24, 2017, Washington, DC.

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Transition metal catalysis has traditionally relied on organometallic complexes that can cycle through a series of groundstate oxidn. levels to achieve a series of discrete yet fundamental fragment- coupling steps. The viability of excited- state organometallic catalysis via direct photoexcitation has been demonstrated extensively over the past 100 years. Although the utility of triplet sensitization by energy transfer has long been known as a powerful activation mode in org. photochem., it is surprising to recognize that photosensitization mechanisms to access excited- state organometallic catalysts have lagged far behind. Here, we demonstrate excited- state organometallic catalysis via such an activation pathway: Energy transfer from an iridium sensitizer produces an excited- state nickel complex that couples aryl halides with carboxylic acids. Detailed mechanistic studies confirm the role of photosensitization via energy transfer.

Item Type:Conference or Workshop Item (Paper)
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Welin, Eric0000-0002-1760-4121
Additional Information:© 2017 American Chemical Society.
Record Number:CaltechAUTHORS:20180502-084836337
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86185
Deposited By: Tony Diaz
Deposited On:03 May 2018 20:22
Last Modified:03 Oct 2019 19:40

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