Dimethylformamide → Phosphonic acid (dimethylamino(methylene))

Participants

Reaction Steps

73.1 parts of dimethyl formamide were mixed with 41 parts by phosphorous acid and this mixture was reacted with 137.3 parts of phosphorus trichloride at about 70°C. A viscous mass was formed, which after about an hour was treated with 180 parts of water. The solution so obtained was filtered and treated with acetone. A precipitate was formed which was further treated as described in Example 1. N,N-dimethyl-1-aminomethane-1,1-diphosphonic acid was obtained in a yield of 76%, based on PCl3.

Provenance & Evidence