Coupling of Alkynes on a Pd-Pd Bond to Generate an Electrophilic µ-Butenediylidene Moiety.
The first dipalladium µ-PPh(3) complex (1) was obtained by the facile loss of two CH(3)CN ligands from [Pd(2)(PPh(3))(2)(CH(3)CN)(4)](PF(6))(2) in CH(2)Cl(2). Coupling of p-tolylacetylene (p-TolC identical withCH) with 1 or its precusor afforded the µ-butenediylidene complex 2, treatment of which with CH(3)CN resulted in PPh(3) migration to give 3.
Murahashi
T
Department of Applied Chemistry Faculty of Engineering, Osaka University Suita, Osaka, 565-0871 (Japan).
Otani
T
Okuno
T
Kurosawa
H