METHOD FOR PREPARING N,N,N',N'-TETRAMETHYL-1,2- AND -1,3-PROPYLENEDIAMINES Russian patent published in 2006 - IPC C07C211/11 C07C209/08 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for synthesis of N,N,N',N'-tetramethyl-1,2- and -1,3-propylenediamines. Method involves interaction of 1,2-dichloropropane or 1,3-dichloropropane with 36-38% an aqueous solution of dimethylamine heated preliminary to temperature 105-110°C wherein 1,2-dichloropropane or 1,3-dichloropropane is added to dimethylamine solution. Synthesis is carried out at temperature 120-125°C and under pressure 0.5-1.1 MPa in the mole ratio of reagents dichloropropane : dimethylamine = 1:(2.1-2.9). Preferably, synthesis is carried out at intensive stirring with rotation number of a mixer 600-2800 rev/min. Method provides enhancing yield and purity of synthesized product and intensifying the process.

EFFECT: improved method of synthesis.

2 cl, 5 ex