Insertion reactions of organic anhydrides into the M–O bond of CuOtBu and Sb(OMe)3

The synthesis and structural characterization of the copper salts [Cu2(2-Boc-benzoate)4(dme)2] (1), [Cu(2-Boc-benzoate)2(tmeda)] (2), [Cu2(2-Boc-benzoate)2(dppm)] (3), [Cu(2-Boc-nicotinate)(PPh3)2] (4), [Cu2{2-Boc-5,6-anhydride-naphthylcarboxylate}2(dppm)2] (5) [dme = 1,2-dimethoxyethane, dppm = bis(diphenylphosphino)methane, tmeda = N,N′-tetramethylethylenediamine, Boc = tert-butoxycarbonyl] prove that cyclic organic anhydrides and dianhydrides readily insert into the Cu–O bond of [CuOtBu] forming carboxylate ligands with ester functionalities in the ligand periphery. [Sb(CO2Ph-o-CO2Me)2(OMe)(tmeda)] (6) was synthesised by insertion reaction of Sb(OMe)3 with phthalic anhydride.

Graphical abstractThe synthesis and structural characterization of new copper carboxylates and an antimony complex obtained by insertion reactions from organic anhydrides into the metal bond of metal alkoxides is reported.Figure optionsDownload full-size imageDownload as PowerPoint slide