Abstract

The Hill-reaction inhibitory activity of 30 derivatives of 2-difluoromethylthio-1,3,5-triazine was determined using chlorella. The structure-activity relationships were analyzed using the hydrophobic parameter (log P), the electronic substituent constant (c) and the steric substituent constant (Es). The Hill-reaction inhibitory activity showed a parabolic relationship to log P and the steric substituent parameters at 4,6-dialkylamino- positions in the triazine ring. The equation revealed that optimum hydrophobicity and size of the substituents were necessary for high activity.

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