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US 4,544,755 AGranted
Cleavage of phthalimides to amines
AssigneeBASF SE
InventorsHelmut Hagen, Rolf-Dieter Kohler
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Abstract
Phthalimides of the formula I ##STR1## where R is a substituent and the ring A can be further substituted, are cleaved by a process in which a compound of the formula I is treated with an alkanolamine. The compounds prepared according to the invention are useful intermediates for the preparation of dyes, drugs and plastics.
Claims13
A process for the cleavage of a phthalimide of the formula I ##STR17## to produce H.sub.2 N--R;
- wherein R is an aliphatic, cycloaliphatic, aromatic or heterocyclic group, and ring A is either unsubstituted or independently substituted by chlorine, bromine, nitro, carboxyl, carbamyl or sulfamyl;
- wherein the compound of formula I is treated with an alkanol amine.
Dependencies are inferred from the claim text.