US 12,275,690 B2
Method for producing isocyanate compound
Hirohisa Nitta, Takarazuka (JP); Yuta Nagashima, Takarazuka (JP); and Hiroki Maruyama, Takarazuka (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
Appl. No. 17/637,905
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP)
PCT Filed Aug. 21, 2020, PCT No. PCT/JP2020/031699
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/039660, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-156453 (JP), filed on Aug. 29, 2019.
Prior Publication US 2022/0274915 A1, Sep. 1, 2022
Int. Cl. C07C 263/10 (2006.01); C07D 257/04 (2006.01)
CPC C07C 263/10 (2013.01) [C07D 257/04 (2013.01)] 9 Claims
 
1. A method for producing the compound represented by formula (2)

OG Complex Work Unit Chemistry
by reacting the compound represented by formula (1) with phosgenes to obtain the compound represented by formula (2),
wherein, in the presence of a water-immiscible solvent and water, the compound represented by formula (1)

OG Complex Work Unit Chemistry
or its salt and the phosgenes are mixed under a condition such that an aqueous layer has a pH of 1 or less.