Process for preparing phenylisopropylurea compounds

Details Process for preparing phenylisopropylurea compounds Process for preparing phenylisopropylurea compounds

C - Chemistry, Metallurgy

07

C

260/547

C07C 273/18 (2006.01) C07C 275/28 (2006.01) C07C 275/30 (2006.01) C07C 275/34 (2006.01)

Patent

CA 1244472

IMPROVED PROCESS FOR PREPARING PHENYLISOPROPYLUREA COMPOUNDS ABSTRACT OF THE DISCLOSURE A new and improved process for making phenyl- isopropylurea derivatives having the formula: Image wherein R1 is selected from hydrogen, halogen, alkyl, alkenyl, haloalkyl or R2 groups and R2 is selected from phenyl, alkyl-substituted phenyl alkoxy-substi- tuted phenyl or haloalkyl-substituted phenyl is disclosed. The process comprises reacting a substituted urea of the formula: Image with an alkenyl aromatic compound of the formula: Image in a polar aprotic solvent, in the presence of an acid catalyst, preferably, sulfuric acid, substituted sulfonic acids or Lewis acids, and stirring the reaction mixture at a temperature of about 20 to 80 C until formation of the precipitated phenylisopropylurea derivative is substan- tially complete.

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