Synthesis and structure of Sb←O intramolecularly coordinated ethynylstibanes

The reaction of OCO chelated organolithium compound LLi (1) (L = 2,6-(t-BuOCH₂)₂C₆H₃) with SbCl₃ in 2:1 molar ratio gave diorganoantimony compound L₂SbCl (2). The reactions of the compound 2 with selected lithium acetylides resulted to the Sb←O coordinated antimony acetylides L₂Sb(CCR) (R = Ph, (3), t-Bu (4), Me₃Si (5)). All studied compounds were characterized by the help of elemental analysis, ¹H and ¹³C NMR spectroscopy and IR spectroscopy. Molecular structures of the compounds 2-4 were determined using the X-ray diffraction technique in the solid state.