Inhibitors of the Hill reaction

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Abstract
One hundred and forty-seven phenylureas, phenylthioureas, acylanilides, acylthioaniiides, and alkylamides were tested as Hill reaction inhibitors. Seven herbicidal triazines were also tested. An attempt was made to correlate molecular structure with the hydrogen bonding tendencies of the substances and with their potencies as inhibitors. On the basis of the evidence presented it is concluded that all of the inhibitory substances resemble phenyldimethylureas in that they are all specific inhibitors of the oxidation of water to molecular O2.