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.