Monomeric triphenylphosphite palladacycles with N-imidazole ligands as catalysts of Suzuki–Miyaura and Sonogashira reactions

Chlorido(1,2-dimethyl-1H-imidazole-κN3){2-[(diphenoxyphosphanyl)oxy]phenyl-κ2C1,P}palladium(II)

“…The angles between adjacent ligands deviate somewhat from the expected value of 90° ( Table 1). However, the observed bond distances and angles are similar to the already reported for analogous complexes (Błaszczyk et al, 2011). In the title compound the metallated carbon is in the trans orientation to the Cl atom.…”

“…In this paper we report the crystallization of a palladacyclic triphenylphosphite complex with a 1,2-dimethylimidazole ligand, the title compound. This complex exhibited high catalytic activity in the Suzuki-Miyaura reaction in ethylene glycol and in the Sonogashira reaction in ionic liquids (Błaszczyk et al, 2011).…”

“…For related structures and further discussion, see: Albinati et al (1990); Błaszczyk et al (2011). For the catalytic reactions, see: Miyaura et al (1981); Sonogashira et al (1975).…”

Orthometallated palladium trimers in C–C coupling reactions

“…In particular, the activity of complex 2a in the second reaction was practically not affected by Hg(0) (69% vs. 68%), indicating the presence of a soluble palladium catalyst. A similar feature we observed earlier for palladium complexes with imidazole ligands [31]. An inhibiting effect of Hg(0) was, however, clearly seen in reactions catalyzed by the orthometallated monomer 4a.…”

“…The first screening experiments (Table 3), performed with 1c as the catalyst precursor, resulted in the selection of the most suitable bases: Cs 2 CO 3 for the SuzukieMiyaura reaction (wich had also been found to be an optimal base for this process during our previous studies [18,31]) and NaOH for the Hiyama reaction [18].…”