Curing fluoroelastomers with curing agents of formulas (I), (II), (III), and (IV): wherein each of R1, R2, R3, R4, R6, R7, R8, and R9, is selected from the group consisting of H; halogen atom; C1 to C4 alkyl groups in which the alkyl group is linear, branched, or cyclic; OR′; and aromatic groups; R5 is H; and R′ is selected from the group consisting of C1 to C4 alkyl groups in which the alkyl group is linear, branched, or cyclic; and phenyl.