Abstract: Some thiourea derivatives were synthesized from corresponding isocyanates and amines: R₁NHCSNHR₂, where R₁=phenyl, α-naphthyl, tertiary butyl; R₂=α-phenyl ethyl, substituted benzyl, and substituted phenyl. Some of the compounds in concentration of 100～500 ppm showed a certain effect on the germination of wheat and cucumber.

Key words: thiourea derivative, plant growth regulator, synthesis