A new set of nickelacyclic carboxylates (“nickelalactones”) containing pyridine as supporting ligand: synthesis, structures and application in C–C– and C–S– linkage reactions
(Me2(2-py)2Si) under exchange of the pyridine ligands to give 1c. 1a–3a and their bipy derivatives react with di-p-tolyldisulfide to form β-thioesters upon workup. Furthermore, reaction of 2-bromopropiophenone with nickelacycles of the type 2 results in the formation of 3,4-diethyl-6-hydroxy-5-methyl-6-phenyl-5,6-dihydro-2H-pyrane-2-one in good yields (64–75%). These reactions offer attractive new preparative