247938-70-1

Basic information

• Product Name: ((CH₃)(CD₃)2CNC₆H₄OC₆H₄N(H)C(CD₃)2(CH₃))Hf(C₄H₉)2⁽¹⁺⁾*B(C₆F₅)4^(1-)=[((CH₃)(CD₃)2CC₁₂H₉ON₂C(CD₃)2(CH₃))Hf(C₄H₉)2]B(C₆F₅)4
• CAS NO: 247938-70-1
• Molecular Weight: 1295.12
• Mol File: 247938-70-1.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: ((CH₃)(CD₃)2CNC₆H₄OC₆H₄N(H)C(CD₃)2(CH₃))Hf(C₄H₉)2⁽¹⁺⁾*B(C₆F₅)4^(1-)=[((CH₃)(CD₃)2CC₁₂H₉ON₂C(CD₃)2(CH₃))Hf(C₄H₉)2]B(C₆F₅)4(CAS DataBase Reference)
• NIST Chemistry Reference: ((CH₃)(CD₃)2CNC₆H₄OC₆H₄N(H)C(CD₃)2(CH₃))Hf(C₄H₉)2⁽¹⁺⁾*B(C₆F₅)4^(1-)=[((CH₃)(CD₃)2CC₁₂H₉ON₂C(CD₃)2(CH₃))Hf(C₄H₉)2]B(C₆F₅)4(247938-70-1)
• EPA Substance Registry System: ((CH₃)(CD₃)2CNC₆H₄OC₆H₄N(H)C(CD₃)2(CH₃))Hf(C₄H₉)2⁽¹⁺⁾*B(C₆F₅)4^(1-)=[((CH₃)(CD₃)2CC₁₂H₉ON₂C(CD₃)2(CH₃))Hf(C₄H₉)2]B(C₆F₅)4(247938-70-1)

Safety Data

• Hazardous Substances Data: 247938-70-1(Hazardous Substances Data)

Upstream product

• 214836-94-9 (((CH₃)(CD₃)2CNC₆H₄)2O)Hf(CH₂CH(CH₃)2)2 
• 189150-96-7 (CH₃(CD₃)2CNHC₆H₄)2O 
• 214836-91-6 (((CH₃)(CD₃)2CNC₆H₄)2O)HfCl₂ 
• 214836-89-2 (((CH₃)(CD₃)2CNC₆H₄)2O)Hf(N(CH₃)2)2 

Relevant articles and documents

Synthesis of titanium, zirconium, and hafnium complexes that contain diamido donor ligands of the type [(t-BuN-o-C6H4)2O]2- and an evaluation of activated versions for the polymerization of 1-hexene

Titanium, zirconium, and hafnium dialkyl complexes that contain the [(t-Bu-d6-N-o-C6H4)2O]2- ([t-BuNON]2-) ligand have been prepared. Only [t-BuNON]TiMe2 could be isolated, but [t-BuNON]ZrR2 and [t-BuNON]HfR2 complexes could be isolated in which (for example) R = Me, Et, or i-Bu. X-ray studies showed [t-BuNON]MMe2 structures (M = Ti or Zr) to be of the "twisted fac" variety in which two amido nitrogens occupy equatorial positions in a distorted trigonal bipyramid. However, in solution all such species show equivalent alkyl groups on the NMR time scale as a consequence of formation of an intermediate mer structure that contains a planar oxygen donor. In analogous complexes that contain the {[Me(CD3)2CNC6H4][Me(CD 3)2CN-2,4-Me2C6H2]O} 2- or {[Me(CD3)2CNC6H4][Me(CD 3)2N-2-EtC6H3]O}2- ligand the two metal alkyl groups are inequivalent on the NMR time scale. Addition of trimethylphosphine to [t-BuNON]Zr(CH2CH3)2 yields structurally characterized, pseudooctahedral [t-BuNON]Zr(η2-C2H4)(PMe3) 2. Addition of B(C6F5)3 to [t-BuNON]ZrMe2 yields structurally characterized {[t-BuNON]ZrMe}[MeB(CeF5)3], while addition of [PhNMe2H]-[B(C6F5)4] to [t-BuNON]ZrMe2 in bromobenzene-d5 generates "{[t-BuNON]ZrMe(PhNMe2)]-[B(C6F5) 4]", which is an active catalyst for the polymerization of up to 500 equiv of 1-hexene in a living manner at 0°C. The analogous hafnium systems are not as well behaved, since the dimethylaniline is insufficiently labile. No polymerization activity is observed for activated titanium dialkyl complexes. Polymerization activity is quenched upon addition of THF or dimethoxyethane to the cationic complexes. An X-ray structure of {[t-BuNON]ZrMe(THF)2]-[B(C6F5)4] shows it to be a pseudooctahedral species in which the [t-BuNON]2- ligand adopts a "twisted mer" geometry, while the X-ray structure of {[t-BuNON]ZrMe(MeOCH2CH2OMe)]-[B(C6F 5)4] was found to be of the "twisted fac" variety. In the case of hafnium, pseudooctahedral cationic bis-THF or DME complexes can be isolated even when the anion is [B(C6H5)4]-; like all complexes that contain THF or DME they are essentially inactive for polymerization of 1-hexene.