Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

US9868702B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Alexander Martin Rüfer · Recklinghausen, DE
• Anne Rittsteiger · Olfen, DE
• Jörg-Joachim Nitz · Essen, DE
• Stephan Kohlstruk · Marl, DE
• Martina Ortelt · Flein, DE
• Dirk Fuchsmann · Haltern am See, DE
• Michael Demming · Ulmen, DE
• Christine Stemmer · Marl, DE
• Denise Ott · Marl, DE
• Anja Stasch · Recklinghausen, DE

Key dates

• Filing date: May 25, 2017
• Grant date: Jan 16, 2018
• Expiry date: May 25, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G59/506
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine by A) reacting triacetonamine (TAA) and malononitrile to afford the intermediate 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile, and B) hydrogenating 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120° C. and at 20-300 bar. In another embodiment, the hydrogenation in step B) of the process is performed in two stages at 20-120° C. and at 20-300 bar.