LoCoco, Matthew D. published the artcileChelate-Controlled Synthesis of rac- and meso-Me2Si(3-tBu-C5H3)2ZrCl2, Application In Synthesis of 10517-44-9, the publication is Organometallics (2003), 22(26), 5498-5503, database is CAplus.
The reaction of the chelated bis-amide complex Zr{PhN(CH2)3NPh}Cl2(THF)2 (2) with Li2[Me2Si(3-tBu-C5H3)2] yields meso-Me2Si(3-tBu-C5H3)2Zr{PhN(CH2)3NPh} (meso-3) in >98% yield. In contrast, the reaction of Zr{Me3SiN(CH2)3NSiMe3}Cl2(THF)2 (4) or the related mono-THF adduct Zr{Me3SiN(CH2)3NSiMe3}Cl2(THF) (5) with Li2[Me2Si(3-tBu-C5H3)2] yields rac-Me2Si(3-tBu-C5H3)2Zr{Me3SiN(CH2)3NSiMe3} (rac-6) in quant. NMR yield and 89% isolated yield. X-ray crystallog. analyses show that the Zr{RN(CH2)3NR} chelate ring in rac-6 has a pronounced twist conformation, while that in meso-3 has a flatter, envelope conformation. It is proposed that the conformations of the Zr{RN(CH2)3NR} chelate rings in the stereodetermining transition states for addition of the second Cp– ring in these reactions are similar to those in the metallocene products and control the diastereoselectivity. Meso-3 and rac-6 are converted to meso-Me2Si(3-tBu-C5H3)2ZrCl2 (meso-1) and rac-1, resp., by reaction with HCl in Et2O.
Organometallics published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Application In Synthesis of 10517-44-9.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia