Migratory Insertion Reactions in Asymmetrical Guanidinate-Supported Zirconium Complexes
摘要:
The new diguanidinate-supported dibenzylzirconium complexes [Zr{kappa N-2,N'-(N-i-Pr)(NAr)CNH(i-Pr)}(2)(CH2Ph)(2)] (Ar = 4-t-BuC6H4 (1), 4-BrC6H4 (2)) and [Zr{kappa N-2,N'-(NEt)(N-t-Bu)CNMe2}(2)(CH2Ph)(2)] (3) have been prepared. Complexes 1 and 2 were synthesized by protonolysis of [Zr(CH2Ph)(4)] with the guanidine derivatives and complex 3 by treating [Zr{kappa N-2,N'-(NEt)(N-t-Bu)CNMe2}(2)Cl-2] (4) with MgCl(CH2Ph). The treatment of 1-3 with 2,6-dimethylphenyl isocyanide (XyNC) results in migratory insertion and formation of the terminal imido species [Zr{kappa N-2,N'-(N-i-Pr)(N(Ar))CNH(i-Pr)}(2){N(2,6-Me2C6H3)}] (Ar = 4-t-BuC6H4 (7), 4-BrC6H4 (8)) with 1 and 2, respectively, whereas the analogous reaction with 3 leads to the enediamido complex [Zr{kappa N-2,N'-(NEt)(N-tBu)CNMe2)}(2){N(2,6-Me2C6H3)(CH2Ph)C=C(CH2Ph)N(2,6-Me2C6H3)}] (9). All the intermediate imincacyl complexes have been characterized, and the molecular structures of 2, 4, and 9 have been determined by single-crystal X-ray diffraction.
Migratory Insertion Reactions in Asymmetrical Guanidinate-Supported Zirconium Complexes
摘要:
The new diguanidinate-supported dibenzylzirconium complexes [Zr{kappa N-2,N'-(N-i-Pr)(NAr)CNH(i-Pr)}(2)(CH2Ph)(2)] (Ar = 4-t-BuC6H4 (1), 4-BrC6H4 (2)) and [Zr{kappa N-2,N'-(NEt)(N-t-Bu)CNMe2}(2)(CH2Ph)(2)] (3) have been prepared. Complexes 1 and 2 were synthesized by protonolysis of [Zr(CH2Ph)(4)] with the guanidine derivatives and complex 3 by treating [Zr{kappa N-2,N'-(NEt)(N-t-Bu)CNMe2}(2)Cl-2] (4) with MgCl(CH2Ph). The treatment of 1-3 with 2,6-dimethylphenyl isocyanide (XyNC) results in migratory insertion and formation of the terminal imido species [Zr{kappa N-2,N'-(N-i-Pr)(N(Ar))CNH(i-Pr)}(2){N(2,6-Me2C6H3)}] (Ar = 4-t-BuC6H4 (7), 4-BrC6H4 (8)) with 1 and 2, respectively, whereas the analogous reaction with 3 leads to the enediamido complex [Zr{kappa N-2,N'-(NEt)(N-tBu)CNMe2)}(2){N(2,6-Me2C6H3)(CH2Ph)C=C(CH2Ph)N(2,6-Me2C6H3)}] (9). All the intermediate imincacyl complexes have been characterized, and the molecular structures of 2, 4, and 9 have been determined by single-crystal X-ray diffraction.