<Tr> <Td> </Td> <Td> </Td> </Tr> <P> 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 . </P> <P> Phthalimide can be prepared by heating phthalic anhydride with aqueous ammonia giving 95--97% yield . Alternatively, it may be prepared by treating the anhydride with ammonium carbonate or urea . It can also be produced by ammoxidation of o - xylene . </P> <P> Phthalimide is used as a precursor to anthranilic acid, a precursor to azo dyes and saccharin . </P>

Mechanism of formation of phthalimide from phthalic anhydride
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