1,3-Dicyclopentadienyltetramethyldisiloxane reacted sequentially with BuLi and Mo(CO)6 to generate 1,1'-(tetramethyldisiloxanediyl)bis[cyclopentadienyltricarbonylmolybdenu m anion salt], (Me2SiOSeMe2) [C5H4Mo(CO)3-Li+]2, (I). I reacted with RX (R = Me, Et, PhCH2, CH2CO2Et; X = halogen) to yield the corresponding molybdenum derivatives II. Their structures were characterized by elemental anal., IR and 1H NMR spectra. The crystal and mol. structure of II (R = iodo) was determine by x-ray diffraction method.

Key words: CRYSTAL STRUCTURE DETERMINATION, INFRARED SPECTROPHOTOMETRY, ELEMENTAL ANALYSIS, X-RAY DIFFRACTION ANALYSIS, SILOXANE, CYCLOPENTADIENE P, PROTON MAGNETIC RESONANCE SPECTROMETRY, MOLYBDENUM COMPLEX, BUTYLLITHIUM, HYDROXYL COMPOUNDS