Phosphine is the common name for phosphorus trihydride (PH3), also known by the IUPAC name phosphane and, occasionally, phosphamine. It is a colorless, flammable gas with a boiling point of ?88 °C at standard pressure. Pure phosphine is odourless, but technical grade phosphine has a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine (P2H4). Phosphines are also a group of substituted phosphines, with the structure R3P, where other functional groups replace hydrogens. They are important in catalysts where they complex to various metal ions; a chiral metal phosphine complex can catalyze a reaction to give chiral products. It is sometimes confused with the unrelated chemical phosgene.

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