Palladium(II)–acetylacetonate complexes containing phosphine and diphosphine ligands and their catalytic activities in telomerization of 1,3-dienes with diethylamine

A series of novel [Pd(acac-O,O′)(PˆP)]BF4 and known complexes [Pd(acac-O,O′)(PR3)2]BF4 (PˆP = dppm (1), dppp (2), dppb (3), dppf (4); R = Ph (5), p-Tol (6), i-Pr (7); acac = 2,4-pentanedionato) were prepared by the reaction of [Pd(acac-O,O′)(MeCN)2]BF4 (1) with appropriate ligands. Complex 2 was characterized by single-crystal X-ray analysis. Models of the structure and IR wavenumbers assignments of the cations of 1–4 were obtained by DFT calculations. Synthesized complexes were tested as catalysts in the telomerization of isoprene and butadiene with diethylamine. In the case of telomerization of butadiene with diethylamine high catalyst activity (e.g. TOFav = 1940 h−1 and TON up to 17,480 for complex 5) was obtained.