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- W2057704429 abstract "Zirconium complexes of the multidentate ligand CpH NMe SiN(H)R (SiNR = -SiMe 2 N-t-butyl; NMe = -CH 2 CH 2 NMe 2 , 1) were prepared and characterized via amine and alkane elimination procedures. Reaction of 1 with Zr(NMe 2 ) 4 gave a mixture of bis-amido complexes 2 in which the ligand was 1,2 and 1,3 substituted. This mixture was converted to the analogous dichlorides 3 using Me 2 NH•HCl and 1,3-3 was purified at this stage; alternatively, 1,3-3 was obtained in one pot from 1 and Zr(NMe 2 ) 4 in ≈70% yield. Conversion of 1,3-3 to dimethyl compound (Cp NMe SiNR)Zr(CH 3 ) 2 , 1,3-4, was accomplished via reaction of the dichloride with methyllithium; methide abstraction with the Lewis acids B(C 6 F 5 ) 3 and [Ph 3 C] + [B(C 6 F 5 ) 4 ] − generated the cationic alkyls [(Cp NMe SiNR)Zr(CH 3 )] + [R′B(C 6 F 5 ) 3 ] − (R′ = CH 3 , 6a; C 6 F 6 , 6b), which were characterized by NMR spectroscopy. Zirconium complexes containing 1 ligated as its 1,2 isomer were obtained from alkane elimination reactions between 1 and in situ prepared R n ZrCl 4−n (R = CH 3 , n = 3; R = CH 2 SiMe 3 , n = 2). 1,2-3 and the methyl chloride complex 1,2-(Cp NMe SiNR)Zr(CH 3 )Cl, 5, were obtained in 18 and 30% yield, respectively. Complex 5 was characterized by X-ray crystallography (monoclinic, space group P2 1 /a, a = 9.6951(10) Å, b = 14.3794(16) Å, c = 14.364(3) Å, V = 1990.3(5) Å 3 , Z = 4, R = 0.046, R w = 0.041.) Key words: amine elimination, Cp-amido, zirconium complexes." @default.
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- W2057704429 date "1996-09-01" @default.
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- W2057704429 title "Zirconium complexes of a cyclopentadienyl-amido ligand with a pendant amine donor via amine and alkane elimination" @default.
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- W2057704429 doi "https://doi.org/10.1139/v96-186" @default.
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