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AssigneeBASF SE
InventorsMartin Fiene, Eckhard Stroefer, Wolfgang Siegel, Stephan Freyer, Oskar Zelder, Gerhard Schulz
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The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof.
A process for preparing pentamethylene 1,5-diisocyanate, which comprises:
Dependencies are inferred from the claim text.
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Preparation of nitrogen-containing organic compounds
Introduction of isotopes of elements into organic compounds ; Labelled organic compounds per se: acyclic or carbocyclic compounds
Derivatives of isocyanic acid: containing at least two isocyanate groups bound to the same carbon skeleton
Polyisocyanates or polyisothiocyanates: acyclic
About 1 year 8 months of term left · ends 25 Jun 2028 (estimated)
The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof.
The preparation of pentamethylene diisocyanate from 1,5-pentanediamine is known per se and can be effected without phosgene (T. Lesiak, K. Seyda, Journal für Praktische Chemie (Leipzig), 1979, 321(1), 161-163) or by reaction with phosgene (e.g. DE 2625075).
DE 1900514 (corresponding to GB 1225450) describes the two-stage preparation of pentamethylene 1,5-diisocyanate from caprolactam by conversion to the hydroxamic acids and the subsequent phosgenation thereof.
This object is achieved by a process for preparing pentamethylene 1,5-diisocyanate, in which
b) lysine is converted to 1,5-pentanediamine and
c) the 1,5-pentanediamine thus obtained is converted to pentamethylene 1,5-diisocyanate.