Biological Activities Studies and Phase Transfer Catalysts Promoting the One-Pot Synthesis of N-Aryl-N′-(4-Ethyloxy Benzoyl)-Thiourea Derivatives

A series of N-aryl-N′-(4-ethyloxybenzoyl)-thiourea 3a–h was synthesized under phase transfer catalysis and r.t. conditions. The chemical structure of all compounds were established by IR, 1H NMR, and 13C NMR studies, and all of the compounds were investigated for plant-growth regulating activity. Excitingly, they remarkably enhance root elongation.