[P:1]([OH:6])([O:4][CH3:5])[O:2][CH3:3].[P:7](=[O:11])([OH:10])([OH:9])[OH:8]>>[P:1]([OH:6])([O:4][CH3:5])[O:2][CH3:3].[P:7](=[O:8])([OH:11])([OH:10])[OH:9]25 parts by weight of dimethyl hydrogen phosphite and 25 parts by weight of phosphoric acid are mixed and reacted. The reaction is exothermic and is completed within 30 minutes to 1 hour, thereby producing a dimethyl hydrogen phosphite-phosphoric acid compound. The chemical reaction may be speeded up by keeping the temperature of the mixture just below the boiling point of the reactants.
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