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Title:
METHOD FOR PRODUCING ISOCYANATE COMPOUNDS, METHOD FOR PRODUCING CARBAMATE COMPOUNDS, METHOD FOR RECOVERING AMINE COMPOUNDS, AND ISOCYANATE COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2023/080257
Kind Code:
A1
Abstract:
The method for producing isocyanate compounds comprises: a step (1) for obtaining an N-substituted carbamate compound by reacting a primary amine compound and a carbonate derivative, while removing by-product compounds that have a boiling point lower than that of the N-substituted carbamate compound; a step (2) for obtaining an isocyanate compound using the reaction solution yielded by the step (1), by subjecting the N-substituted carbamate compound to thermal decomposition in the presence of an aprotic solvent and while removing the by-product hydroxy compound; a step (3) for separating the isocyanate compound and aprotic solvent from the reaction solution yielded by the step (2); and a step (4) for purifying the isocyanate compound by removing, from the fraction obtained in the step (3), component that has a boiling point higher than that of the isocyanate compound.

Inventors:
TAKAGAKI KAZUHIRO (JP)
IWATA YUSUKE (JP)
NAKAOKA KOICHI (JP)
SAKURAI YUSUKE (JP)
NAGAMOTO MIDORI (JP)
Application Number:
PCT/JP2022/041611
Publication Date:
May 11, 2023
Filing Date:
November 08, 2022
Export Citation:
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Assignee:
ASAHI CHEMICAL IND (JP)
International Classes:
C07C263/04; C07C209/86; C07C211/49; C07C263/18; C07C265/14; C07C269/04; C07C271/28; C07C271/44; C07C271/56; C07B61/00
Domestic Patent References:
WO2011021257A12011-02-24
WO2013111353A12013-08-01
WO2019131855A12019-07-04
WO2015030106A12015-03-05
Other References:
ENGLUND ETHAN A., GOPI HOSAHUDYA N., APPELLA DANIEL H.: "An Efficient Synthesis of a Probe for Protein Function:‚ÄČ 2,3-Diaminopropionic Acid with Orthogonal Protecting Groups", ORGANIC LETTERS, AMERICAN CHEMICAL SOCIETY, US, vol. 6, no. 2, 1 January 2004 (2004-01-01), US , pages 213 - 215, XP093062691, ISSN: 1523-7060, DOI: 10.1021/ol0361599
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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