Phtalimide is known for its moisture and acid resistance. It is mainly used as a rawmaterial of anthrancilic compound. Phthalimide is the organic compound with the formula C H „(CO) ‚NH. It is the imide derivative of phthalic anhydride. It is a sublimable white solid that is slightly soluble in water but more so upon addition of base. It is used as a precursor to other organic compounds as a masked source of ammonia.It is also use for manufacturing of pharma bulk drugs.