Synthesis of (η6-Arene)tricarbonylchromium Complexes of 1,3-Benzodioxanes

The reactions of triammino(tricarbonyl)chromium ( I ) with 1,3-benzodioxane (L 1 ), 2-methyl-1,3-benzodioxane (L 2 ), and 2-phenyl-1,3-benzodioxane (L 3 ) afford new complexes: (η 6 -C 8 H 8 O 2 )Cr(CO) 3 ( II ), exo - and endo -[2-Me-(η 6 -C 8 H 7 O 2 )]Cr(CO) 3 ( III , IV ), exo - and endo -[2-Ph-(η 6 -C 8 H 7 O 2 )]Cr(CO) 3 ( V , VI ), [2-(η 6 -Ph)-C 8 H 7 O 2 ]Cr(CO) 3 ( VII ), and endo -[2-(η 6 -Ph)]Cr(CO) 3 -[η 6 -C 8 H 7 O 2 ]Cr(CO) 3 ( VIII ). The structures, compositions, and purity of the synthesized products are proved by UV, IR, and 1 H NMR spectroscopy, HPLC, and mass spectrometry. The molecular structures of complexes IV – VI are determined by XRD (CIF files CCDC nos. 2263301 ( IV ), 2295552 ( V ), and 2237106 ( VI )). A possibility of coordination of the tricarbonylchromium group at different sides of the phenylene ring of ligands L 2 and L 3 and on the phenyl substituent of ligand L 3 is shown.