Process for the preparation of herbicidally active compounds...

Details Process for the preparation of herbicidally active compounds... Process for the preparation of herbicidally active compounds...

C - Chemistry, Metallurgy

07

F

260/501.1

C07F 9/38 (2006.01) A01N 57/18 (2006.01)

Patent

CA 1135279

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the preparation of compounds containing phosphorus-carbon-nitrogen bond of the general formula I Image (I) wherein R1 and R2 are the same or different and stand for hydrogen or an organic radical, R3 and R4 are the same or different and stand for hydrogen, hydroxy or an organic radical, the compounds are prepared by reacting phosphorus halide with ammonia, water soluble ammonium salts, primary or secondary amine in the presence of water and further with aldehyde or ketone. The product is recovered by reducing the reaction volume or by adding a water miscible organic solvent to the reaction mixture, the process is preferably suitable for the preparation of N-phosphono-methyl- glycine and derivatives thereof, which are significant in the plant protection as herbicidally active compounds.

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