A Terminal Rh Methylidene from Activation of CH2Cl2

Oxidative addition of carbonhalogen bonds at transition metals typically follows either a two-electron pathway (concerted MR/MX formation) or a radical chain pathway (stepwise MR/MX 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., CH(2)Cl2 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 toward reactive metal alkylidenes using milder and less-reactive carbenoid precursors than what is presently used.