title: A new route to acyclic diaminocarbenes via lithium-halogen exchange.
abstract: A lithium-halogen exchange route has been developed to generate acyclic diaminocarbenes (ADC) from chloroamidinium salts. Convenient access to various ADC complexes (B, Rh, Ir, Pd) stems from a one-pot transmetalation protocol. Formation of a carbenoid species is suggested by 1D and 2D NMR studies with a (13)C-labeled chloroamidinium precursor and also by X-ray structures of transition metal-carbene complexes. Rh-ADC complex 4 is an effective catalyst for the 1,2-addition of aryl boronic acids to aryl aldehydes.
authors: Department of Chemistry, University of Florida, P. O. Box 117200, Gainesville, Florida 32611-7200, USA.
authors: David R
authors: DR
authors: Snead
authors: Ion
authors: I
authors: Ghiviriga
authors: Khalil A
authors: KA
authors: Abboud
authors: Sukwon
authors: S
authors: Hong
mesh_terms: D000480:Alkynes / Q000138:chemical synthesis*; D002384:Catalysis; D004148:Dioxolanes / Q000138:chemical synthesis*; D006219:Halogens / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*
chemical_list: D000480:Alkynes; D004148:Dioxolanes; D006219:Halogens; C504703:aminocarbene; D008094:Lithium