text: <unk>  (abbreviated<unk>  is a colorless organic liquid with the formula [(CH3)2N]3PO. It is used as a polymer solvent, as a selective solvent for gases, stabilizer in polystyrene against thermal degradation, as a laboratory solvent for organometallic and organic reactions. It has been tested as a fire retardant and as an insect chemosterilant, but there is no known current use of<unk>  for these applications. It is useful for improving the selectivity of certain organic reactions.  For instance in some deprotonation reactions<unk>  breaks up the oligomers of lithium bases such as butyl lithium.  Also because<unk>  solvates cations so well, while not solvating anions, it has been used as a solvent for some difficult SN2 reactions. The basic oxygen atom in<unk>  coordinates strongly to lithium cation.  A molybdenum peroxide complex of<unk>  is used in synthetic chemistry as an oxidant.<unk>  is the oxide of the highly basic tertiary phosphine P(NMe2)3.  Like other phosphine oxides, e.g. Triphenylphosphine oxide, the molecule has tetrahedral core and the P-O bond is highly polarlized, with significant negative charge residing on oxygen.
option_0: Hexamethylphosphoramide
option_1: Ethacridine lactate
option_2: Ammonium hexachloroplatinate
option_3: Indigo carmine
option_4: Sodium selenate
option_5: Indium oxyquinoline
option_6: Sodium monofluorophosphate
option_7: Mercuric iodide