A procatalyst according to formula: where: M is nickel or palladium; X is a ligand chosen from (C 1 -C 40)hydrocarbyl, (C 1 -C 40)heterohydrocarbyl, -H, -CH 2 Si(R C) 3-Q (OR C) Q, -Si(R C) 3-Q (OR C) Q, -OSi(R C) 3-Q (OR C) Q, -Ge(R C) 3-Q (OR C) Q, -P(R C) 2-W (OR C) W, -P (R C) 2-W (OR C) W, -N(R C) 2, -N(Si(R C) 3) 2, -NR C Si(R C) 3, -OR C, -SR C, -NO 2, -CN, -CF 3, -OCF 3, -S R C, -S 2 R C, -OS 2 R C, -N=C(R C) 2, -N=CH(R C), -N=CH 2, -N=P(R C) 3, -OC R C, -C OR C, -C R C, -C H, -N(R C)C R C, -N(R C)C H, -NHC R C, -NHC H, -C N(R C) 2, -C NHR C, -C NH 2, or a halogen, wherein each R C is independently (C 1 -C 30)hydrocarbyl optionally substituted with one or more R S or (C 1 -C 30)heterohydrocarbyl optionally substituted with one or more R S, wherein subscript Q is 0, 1, 2, or 3, and wherein subscript W is 0, 1, or 2; Y is a Lewis base; optionally, Y and X are covalently connected; R 1 is chosen from unsubstituted (C 6 -C 40)aryl, substituted (C 6 -C 40)aryl, unsubstituted (C 1 -C 40)heteroaryl having its radical on a carbon atom, substituted (C 1 -C 40)heteroaryl having its radical on a carbon atom, or substituted (C 4 -C 20)alkyl having at least one tertiary carbon atom and its radical on the tertiary carbon atom of the (C 4 -C 20)alkyl, provided that: R 2 and R 3 are independently selected from radicals having formula: where: each R 11, R 12, R 13, R 14, and R 15 are independently, (C 1 -C 30)hydrocarbyl, (C 1 -C 30)heterohydrocarbyl, -OR N, -NR N 2, -SR N, halogen, or -H, where R N is (C 1 -C 30)hydrocarbyl; provided that at least one of R 11 and R 15 is not -H; and each R S in formula is independently (C 1 -C 20)hydrocarbyl or halogen. M is nickel or palladium; X is a ligand chosen from (C 1 -C 40)hydrocarbyl, (C 1 -C 40)heterohydrocarbyl, -H, -CH 2 Si(R C) 3-Q (OR C) Q, -Si(R C) 3-Q (OR C) Q, -OSi(R C) 3-Q (OR C) Q, -Ge(R C) 3-Q (OR C) Q, -P(R C) 2-W (OR C) W, -P (R C) 2-W (OR C) W, -N(R C) 2, -N(Si(R C) 3) 2, -NR C Si(R C) 3, -OR C, -SR C, -NO 2, -CN, -CF 3, -OCF 3, -S R C, -S 2 R C, -OS 2 R C, -N=C(R C) 2, -N=CH(R C), -N=CH 2, -N=P(R C) 3, -OC R C, -C OR C, -C R C, -C H, -N(R C)C R C, -N(R C)C H, -NHC R C, -NHC H, -C N(R C) 2, -C NHR C, -C NH 2, or a halogen, wherein each R C is independently (C 1 -C 30)hydrocarbyl optionally substituted with one or more R S or (C 1 -C 30)heterohydrocarbyl optionally substituted with one or more R S, wherein subscript Q is 0, 1, 2, or 3, and wherein subscript W is 0, 1, or 2; Y is a Lewis base; optionally, Y and X are covalently connected; R 1 is chosen from unsubstituted (C 6 -C 40)aryl, substituted (C 6 -C 40)aryl, unsubstituted (C 1 -C 40)heteroaryl having its radical on a carbon atom, substituted (C 1 -C 40)heteroaryl having its radical on a carbon atom, or substituted (C 4 -C 20)alkyl having at least one tertiary carbon atom and its radical on the tertiary carbon atom of the (C 4 -C 20)alkyl, provided that: R 2 and R 3 are independently selected from radicals having formula: where: each R 11, R 12, R 13, R 14, and R 15 are independently, (C 1 -C 30)hydrocarbyl, (C 1 -C 30)heterohydrocarbyl, -OR N, -NR N 2, -SR N, halogen, or -H, where R N is (C 1 -C 30)hydrocarbyl; provided that at least one of R 11 and R 15 is not -H; and each R S in formula is independently (C 1 -C 20)hydrocarbyl or halogen.