Abstract N-(2, 6-Dichlorobenzoyl)-and N-(2, 6-difluorobenzoyl)-N′-pyrimidinylureas 3b–3n have been synthesized by reaction of the corresponding aminopyrimidine derivatives with 2, 6-dichlorobenzoyl isocyanate or 2, 6-difluorobenzoyl isocyanate. The insecticidal activity of compounds 3b–3n has been evaluated.