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

The reactions of triammino(tricarbonyl)chromium (I) with 1,3-benzodioxane (L¹), 2-methyl-1,3-benzodioxane (L²), and 2-phenyl-1,3-benzodioxane (L³) afford new complexes: (η⁶-C₈H₈O₂)Cr(CO)₃ (II), exo- and endo-[2-Me-(η⁶-C₈H₇O₂)]Cr(CO)₃ (III, IV), exo- and endo-[2-Ph-(η⁶-C₈H₇O₂)]Cr(CO)₃ (V, VI), [2-(η⁶-Ph)-C₈H₇O₂]Cr(CO)₃ (VII), and endo-[2-(η⁶-Ph)]Cr(CO)₃-[η⁶-C₈H₇O₂]Cr(CO)₃ (VIII). The structures, compositions, and purity of the synthesized products are proved by UV, IR, and ¹H 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 L² and L³ and on the phenyl substituent of ligand L³ is shown.