Granted Patent
B2
US 10,774,100 · App. 16/460,332 · Granted Sep 15, 2020
Crystal of cyclic phosphonic acid sodium salt and method for manufacturing same
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Abstract
An object t of the present invention is to proroaide crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1):
Claims (4)
1. A method for producing a compound represented by formula (6):
wherein two R 1 groups are the same or different and represent alkyl, arylalkyl, or aryl; and two R 2 groups are the same or different and represent alkyl, cycloalkyl, or aryl, the method comprising
step (I)) of reacting a compound represented by formula (5):
wherein R 2 is as defined above; and X represents a halogen atom with a phosphorous acid diester.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Feb 18, 2021
From: OTSUKA CHEMICAL CO., LTD.
To: OTSUKA CHEMICAL CO., LTD.; SANSHO CO., LTD.
Reel/Frame 055311/0364 →
Priority Claims (1)
JP 2014-164423
· Aug 12, 2014
· national
Continuity (3)