a b s t r a c tNovel dinuclear palladium complexes having two isocyanide ligands were synthesized by using a binucleating ligand, N,N 0 -bis[2-(diphenylphsphino)phenyl]formamidinate (dpfam). The structure of [Pd 2 (l-dpfam)(tert-BuNC) 2 ]Cl was confirmed by X-ray analysis, showing that the Pd-Pd bond length of 2.5824(3) Å falls well within the range of those for known dipalladium complexes having the edge-sharing structure and two isocyanides coordinate to palladium in almost parallel and in close proximity. The dinuclear complex [Pd 2 (l-dpfam)(tert-BuNC) 2 ]PF 6 served as catalyst for pyrrole formation from tertbutylisocyanide and various alkynes.

Application as Catalysts to Pyrrole Formation from tert-Butylisocyanide and Alkynes. -The novel palladium complex gives better yields than Pd(PPh3)4. -(TSUKADA*, N.; WADA, M.; TAKAHASHI, N.; INOUE, Y.; J.