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Rh Methylidenes from Redox Cascade Activation of Chloroalkanes

preprint
submitted on 13.08.2019 and posted on 14.08.2019 by Travis J. Morrow, Jordan Gipper, William E. Christman, Navamoney Arulsamy, Elliott Hulley

Oxidative addition of carbon-halogen bonds at transition metals typically follow either a two-electron pathway (concerted M-R/M-X formation) or a radical chain pathway (stepwise M-R/M-X formation). When the reactive metal species is generated slowly, however, both mechanisms can compete to yield unexpected reactivity paths. The present report highlights the synthesis of rhodium methylidenes from chloroalkanes (e.g. CH2Cl2 and CHCl3) at POP-pincer frameworks (e.g. POP = 4,6-bis(di-tert- butylphosphino)dibenzo[b,d]furan) via a cascade of halide abstraction and electron transfer steps. Experimental and computational studies are reported that support the proposed mechanism, including characterization of important reaction intermediates. The overall transformation represents a route towards reactive metal alkylidenes using milder and less-reactive carbenoid precursors than what is presently used.

History

Email Address of Submitting Author

ehulley@uwyo.edu

Institution

University of Wyoming

Country

United States of America

ORCID For Submitting Author

0000-0002-2630-3689

Declaration of Conflict of Interest

None

Exports