A process for the preparation of a (1 R ,3 R )- or a (1 S ,3 S )-2,2-dihalo-3-(substituted phenyl)cyclopropanecarboxylic acid of Formula 1-2A or Formula 1-2B wherein: (A) R 1 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (B) R 2 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (C) R 3 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (D) R 4 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (E) R 5 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; and (G) X 2 is selected from the group consisting of F, Cl, Br, and I; comprising: a) treating a racemic mixture of a trans-2,2-dihalo-3-(substituted phenyl)cyclopropane-carboxylic acid of Formula 1-1 with an enantiomeric amine of Formula 2-1 or 2-2 wherein: X 1 is selected from the group consisting of C 1 -C 4 alkyl and benzyl; to form a mixture; b) isolating a diastereomeric amine salt of Formula 3-1A or Formula 3-1B, or of Formula 3-2A or Formula 3-2B, from the mixture; and c) treating the isolated diastereomeric amine salt of Formula 3-1A or 3-1B, or of Formula 3-2A or 3-2B, with an acid to provide the (1 R ,3 R )- or the (1 S ,3 S )-2,2-dihalo-3-(substituted phenyl)cyclopropanecarboxylic acid of Formula 1-2A or Formula 1-2B. (A) R 1 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (B) R 2 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (C) R 3 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (D) R 4 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; (E) R 5 is selected from the group consisting of H, F, Cl, Br, I, CN, NO 2 , SF 5 , (C 1 -C 3 )alkyl, and (C 1 -C 3 )haloalkyl; and (G) X 2 is selected from the group consisting of F, Cl, Br, and I; comprising: a) treating a racemic mixture of a trans-2,2-dihalo-3-(substituted phenyl)cyclopropane-carboxylic acid of Formula 1-1 with an enantiomeric amine of Formula 2-1 or 2-2 wherein: X 1 is selected from the group consisting of C 1 -C 4 alkyl and benzyl; to form a mixture; b) isolating a diastereomeric amine salt of Formula 3-1A or Formula 3-1B, or of Formula 3-2A or Formula 3-2B, from the mixture; and c) treating the isolated diastereomeric amine salt of Formula 3-1A or 3-1B, or of Formula 3-2A or 3-2B, with an acid to provide the (1 R ,3 R )- or the (1 S ,3 S )-2,2-dihalo-3-(substituted phenyl)cyclopropanecarboxylic acid of Formula 1-2A or Formula 1-2B. a) treating a racemic mixture of a trans-2,2-dihalo-3-(substituted phenyl)cyclopropane-carboxylic acid of Formula 1-1 with an enantiomeric amine of Formula 2-1 or 2-2 wherein: X 1 is selected from the group consisting of C 1 -C 4 alkyl and benzyl; to form a mixture; b) isolating a diastereomeric amine salt of Formula 3-1A or Formula 3-1B, or of Formula 3-2A or Formula 3-2B, from the mixture; and c) treating the isolated diastereomeric amine salt of Formula 3-1A or 3-1B, or of Formula 3-2A or 3-2B, with an acid to provide the (1 R ,3 R )- or the (1 S ,3 S )-2,2-dihalo-3-(substituted phenyl)cyclopropanecarboxylic acid of Formula 1-2A or Formula 1-2B. <EOS>