A catalyst prepared with one or more metal-ligand complexes, an alkylaluminum and a boron-containing ionic compound, preparation of the catalyst comprising steps of contacting the one or more metal-ligand complexes to the alkylaluminum to produce an intermediate derivative therefrom; and then contacting the intermediate derivative to the boron-containing ionic compound to produce the catalyst; each contacting step being performed under independent catalyst preparing conditions; the boron-containing ionic compound comprising a cation and a boron-containing anion; the ratio of total number of moles of the alkylaluminum to total number of moles of the one or more metal-ligand complexes being from 1:1 to 100:1; and the ratio of total number of moles of the boron-containing ionic compound to the total number of moles of the one or more metal-ligand complexes being from 1:1 to 5:1; and the metal-ligand complex being a metal-ligand complex of formula: wherein: M is titanium, zirconium, or hafnium; X 1 is O, N, or N(L 3); X 2 is O, N, or N(L 4); Each of L1 1 and L 2 independently is (C 1 -C 40)hydrocarbyl; Each of L 3 and L 4 independently is (C 1 -C 40)hydrocarbyl; or L 3 is taken together with L 1 to form a (C 2 -C 40)alkylene, L 4 is taken together with L 2 to form a (C 2 -C 40)alkylene, L 3 is taken together with L 4 to form a (C 2 -C 40)alkylene, or any combination thereof; Each of -X 1 -L 1 and -X 2 - L 2 being an anion having a formal oxidation state of -1; Two of R 1, R 2, R 3, and R 4 independently are neutral ligands and the other two of R 1, R 2, R 3, and R 4 independently are anionic ligands, each neutral ligand independently being R M NR K R L, R K OR L, R K SR L, or R M PR K R L, wherein each R K, R L, and R M independently is hydrogen, (C 1 -C 40)hydrocarbyl, or (C 1 -C 40)heterohydrocarbyl, or any R K and R L, or any two R K, the R K and R L or two R K being of a same or different ligand, independently are taken together to form a (C 2 -C 40)hydrocarbylene or (C 1 -C 40)heterohydrocarbylene, and any remaining R K and R L are as defined above; and each anionic ligand independently having a formal oxidation state of -1 and independently being R K -P=N -, (R K) 2 C=N -, R K R L N -, R K O -, R K S -, R K R L P -, or R M R K R L Si -, wherein each R K, R L, and R M independently is as defined above; where R 1, R 2, R 3, and R 4 are selected depending on the formal oxidation state of M such that the metal-ligand complex of formula is, in aggregate, neutral; Each of the aforementioned (C 2 -C 40)alkylene, (C 1 -C 40)hydrocarbyl, (C 1 -C 40)heterohydrocarbyl, (C 2 -C 40)hydrocarbylene, and (C 1 -C 40)heterohydrocarbylene independently are the same or different and independently is unsubstituted or substituted with one or more substituents R S; and Each R S independently is halo, polyfluoro, perfluoro, unsubstituted (C 1 -C 18)hydrocarbyl, F 3 C-, FCH 2 O-, F 2 HCO-, F 3 CO-, oxo (i.e., =O), R 3 Si-, RO-, RS-, RS -, RS 2 -, R 2 P-, R 2 N-, R 2 C=N-, NC-, RC O-, ROC -, RC N -, or R 2 NC -, wherein each R independently is an unsubstituted (C 1 -C 18)hydrocarbyl. M is titanium, zirconium, or hafnium; X 1 is O, N, or N(L 3); X 2 is O, N, or N(L 4); Each of L1 1 and L 2 independently is (C 1 -C 40)hydrocarbyl; Each of L 3 and L 4 independently is (C 1 -C 40)hydrocarbyl; or L 3 is taken together with L 1 to form a (C 2 -C 40)alkylene, L 4 is taken together with L 2 to form a (C 2 -C 40)alkylene, L 3 is taken together with L 4 to form a (C 2 -C 40)alkylene, or any combination thereof; Each of -X 1 -L 1 and -X 2 - L 2 being an anion having a formal oxidation state of -1; Two of R 1, R 2, R 3, and R 4 independently are neutral ligands and the other two of R 1, R 2, R 3, and R 4 independently are anionic ligands, each neutral ligand independently being R M NR K R L, R K OR L, R K SR L, or R M PR K R L, wherein each R K, R L, and R M independently is hydrogen, (C 1 -C 40)hydrocarbyl, or (C 1 -C 40)heterohydrocarbyl, or any R K and R L, or any two R K, the R K and R L or two R K being of a same or different ligand, independently are taken together to form a (C 2 -C 40)hydrocarbylene or (C 1 -C 40)heterohydrocarbylene, and any remaining R K and R L are as defined above; and each anionic ligand independently having a formal oxidation state of -1 and independently being R K -P=N -, (R K) 2 C=N -, R K R L N -, R K O -, R K S -, R K R L P -, or R M R K R L Si -, wherein each R K, R L, and R M independently is as defined above; where R 1, R 2, R 3, and R 4 are selected depending on the formal oxidation state of M such that the metal-ligand complex of formula is, in aggregate, neutral; Each of the aforementioned (C 2 -C 40)alkylene, (C 1 -C 40)hydrocarbyl, (C 1 -C 40)heterohydrocarbyl, (C 2 -C 40)hydrocarbylene, and (C 1 -C 40)heterohydrocarbylene independently are the same or different and independently is unsubstituted or substituted with one or more substituents R S; and Each R S independently is halo, polyfluoro, perfluoro, unsubstituted (C 1 -C 18)hydrocarbyl, F 3 C-, FCH 2 O-, F 2 HCO-, F 3 CO-, oxo (i.e., =O), R 3 Si-, RO-, RS-, RS -, RS 2 -, R 2 P-, R 2 N-, R 2 C=N-, NC-, RC O-, ROC -, RC N -, or R 2 NC -, wherein each R independently is an unsubstituted (C 1 -C 18)hydrocarbyl.