Phosphine is obtained by the reaction when:
White phosphorus is heated with NaOH.
Ca3P2 reacts with water.
Red phosphorus is heated with NaOH.
Phosphorus is heated in a current of hydrogen.
P4+3NaOH+3H2O⟶PH3↑+3NaH2PO2
Ca3P2+6H2O⟶3Ca(OH)2+2PH3↑
Acetamide is heated with phosphorus pentoxide and the product reduced by hydrogenation to yield: