Abstract: Compounds of the formula: ##STR1## WHEREIN R is alkyl of from 1 to 8 carbon atoms, inclusive; alkoxy of from 1 to 8 carbon atoms, inclusive; haloalkoxy of from 1 to 8 carbon atoms, inclusive; cycloalkyl of from 3 to 8 carbon atoms, inclusive; cycloalkoxy of from 3 to 8 carbon atoms, inclusive; or haloalkyl of from 1 to 8 carbon atoms, inclusive; R' is lower-alkyl of from 1 to 8 carbon atoms, inclusive, phenyl, cycloalkyl of from 3 to 8 carbon atoms, inclusive; or X; X is bromine, chlorine, or fluorine; m is an integer 0 through 5, inclusive, and Y is (independently when m is more than 1) halogen, lower-alkyl of from 1 to 4 carbon atoms, inclusive, lower-alkoxy of from 1 to 4 carbon atoms, inclusive, or halolower-alkyl of from 1 to 4 carbon atoms, inclusive; providing however, that m is 2 to 5 whenever R' is X, and that the sum of the carbon atoms in substituents (Y).sub.m is not more than 15.

Abstract: A new method for controlling parasitic worms in animals is described. The method employs a new chemical compound: 3-phenylpyruvoyl chloride 1-phenylhydrazone. Formulations of the compound with diluent carriers and adjuvants are discussed and exemplified. A synthesis of the compound is described.

Abstract: This invention relates to a new method of using and formulations of pyruvoyl chloride phenylhydrazones of the formula ##SPC1##Wherein Y is selected from the group consisting of chloro, bromo, nitro and trifluoromethyl and Y' has the same meaning as Y and in addition hydrogen, that have been found to be effective broad spectrum anthelmintics for suppressing parasitic worms in animals. The compounds are readily prepared by conventional chemical reactions.