A class of 1,4-diphenyl-3-pyrazolin-5-ones are useful as herbicides. The compounds have small alkyl substituents at the 2-position, and the phenyl rings may be substituted as well.
A class of 1,4-diphenyl-3-pyrazolin-5-ones are useful as aquatic algicides. The compounds have small alkyl substituents at the 2-position, and the phenyl rings may be substituted as well.