Novel cyclopentadienyl silanes and disilanes: synthesis, structure and gas-phase pyrolysis

The new chloro(cyclopentadienyl)silanes Cp′SiHyCl3−y (Cp′=Me4EtC5, y=1: 1; Cp′=Me4C5H, y=1: 2; y=0: 3; Cp′=Me3C5H2, y=1: 4 and pentachloro(cyclopentadienyl)disilanes Cp′Si2Cl5 (Cp′=Me5C55, Me4EtC56, Me4C5H 7, Me3C5H28, Me3SiC5H49) are synthesized in good yields via metathesis reactions. Treatment of 1–9 with LiAlH4 leads under Cl–H exchange to the hydridosilyl compounds Cp′SiH3 (Cp′=Me4EtC510, Me4C5H 11, Me3C5H212) and to the hydridodisilanyl compounds Cp′Si2H5 (Cp′=Me5C513, Me4EtC514, Me4C5H 15, Me3C5H216, Me3SiC5H417). Complexes 1–17 are characterized by 1H, 13C, and 29Si-NMR spectroscopy, IR spectroscopy, mass spectrometry and CH-analysis. The structures of 6, 7 and 9 are determined by single-crystal X-ray diffraction analysis. Pyrolysis studies of the cyclopentadienylsilanes 10–12 and disilanes 13–17 show their suitability as precursors in the MOCVD process.