Process for the preparation of mono-condensation derivatives of

Details Process for the preparation of mono-condensation derivatives of Process for the preparation of mono-condensation derivatives of

1992-10-05

1994-02-15

Tsang, Cecilia

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

560145, 560155, 560170, 560172, 560202, 562439, 562450, 562457, 562507, 562509, 562553, 562590, C07D30500, C07C22900, C07C20500

Patent

active

052868796

ABSTRACT:
An improved process for preparing mono-condensation derivatives of adipic acid with fewer steps and better purity is disclosed. In particular, this process comprises: (a) forming relatively concentrated and pure cyclic monomeric adipic anhydride by depolymerization and concentration starting from polymeric adipic anhydride; and (b) adding a condensation reactant having an active hydrogen, e.g., a primary or secondary amine, to said cyclic monomeric adipic anhydride to form the corresponding mono-condensation derivative of adipic acid.

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patent: 5206432 (1993-04-01), Chou
"Studies on Polymerization and Ring Formation. VI. Adipic Anhydride," Julian W. Hill, J. Am. Chem. Society, 1930. vol. 52, pp. 4110-4114.
"Melt Polymerization of Adipic Anhydride (Oxepane-2,7-Dione)," Albertsson et al., J. Macromol. Sci.-Chem., vol. A27(4), 1990, pp. 397-412.
"Polymerization of Oxepan-2,7-Dione in Solution and Synthesis of Block Copolymers of Oxepan-2,7-Dione and 2-Oxepanone," Lundmark et al., J. Macromol. Sci.-Chem., vol. A28(1), 1991, pp. 15-29.
"Adipic Acid," Kirk-Othmer's Encyclopedia of Chemical Technology, vol. 1, 1978, pp. 510-531.

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