Process for preparing cyclic diamines
AssigneeBASF SE
InventorsKirsten Dahmen, Martin Ernst, Michael Limbach, Johann-Peter Melder, Beatrice Rössler-Feigel, Joaquim Henrique Teles
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing a cyclic diamine, comprising the reaction of at least one cyclic alkene with a gas mixture (G) comprising dinitrogen the subsequent conversion of monoxide to give at least one cyclic ketone and then converting the at least one cyclic ketone to a cyclic diamine. The invention also relates to the use of a cyclic diamine with primary and secondary amine functions thus obtained to prepare polyamides and polyurethanes.
Claims20
1-17. (canceled)
A process for preparing at least one cyclic diamine selected from a diamine of the formulae (Ia), (Ib), (Ic) or (Id)
- wherein the R1, R2, R3, R4, R5, R6, R7, R8, R9, Ra, Rb radicals are each independently selected from the group consisting of H and alkyl;
- and where R1 or R2 is, or R1 and R2 are each, H, said process comprising at least steps (I) to (II):
- (I) reacting at least one compound selected from a compound of the formulae (IIa) and (IIb)
- wherein X is a group selected from the group consisting of —CN, —CHO—, —CO2Rc, —C(═O)Rb, —CONRc and —CH2OH, where Rb is selected from the group consisting of H and alkyl, and where Rc is independently selected from the group consisting of H and alkyl;
- with a gas mixture (G) comprising dinitrogen monoxide to obtain at least one compound selected from compounds of the formulae (IIIa), (IIIb), (IIIc) and (IIId)
- (II) converting the at least one compound obtained in step (I) to at least one compound selected from compounds of the formulae (Ia), (Ib), (Ic) and (Id).
Dependencies are inferred from the claim text.