Assertion: silicon | /r/HasProperty | valuable
Facets:
Source sentences:
text: For example, (Me 3 Si) 2 O is valuable for the preparation of derivatives of molybdenum and tungsten oxyhalides, converting a tungsten hexachloride suspension in dichloroethane solution quantitatively to WOCl 4 in under an hour at room temperature, and then to yellow WO 2 Cl 2 at 100 °C in light petroleum at a yield of 95% overnight.