5-(Arylmethylene)hydantoins (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) and 5-(arylmethylene)-2-thiohydantoins (20-37) have been synthesized by condensation of aromatic aldehydes with hydantoin (1) or 2-thiohydantoin (2) in the presence of ethanolamine. A number of 5-alkyl-and 5-(arylmethyl)hydantoins (40-48) and their 2-thio analogs (50-55) were synthesized from amino acids. All of these compounds were tested for pesticidal activity.

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