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• W2041702905 abstract "The reduction of Cp*2HfCl2 with lithium in the presence of disubstituted butadiynes RC≡C−C≡CR (R = Ph, SiMe3, t-Bu) in toluene leads, respectively, to the five-membered hafnacyclocumulene complexes Cp*2Hf(η4-1,2,3,4-PhC4Ph) (1-Hf) and Cp*2Hf(η4-1,2,3,4-Me3SiC4SiMe3) (2-Hf) and, in the case of 1,4-bis(tert-butyl)butadiyne by a 2-fold activation of the methyl groups of one pentamethylcyclopentadienyl ligand, to the complex Cp*Hf[−C(═C═CH-t-Bu)−CH(t-Bu)CH2−η5-C5Me3−CH2−] (3-Hf) containing a fulvene ligand that is coupled to the modified substrate (allenic subunit). The latter inserts 2 equiv of the isocyanide t-BuNC to give by coupling of the isocyanide molecules the complex Cp*Hf[−C(═C═CH-t-Bu)−CH(t-Bu)CH2−η5-C5Me3−CH2−C(═N-t-Bu)−C(═N-t-Bu)−] (4). The structures of complexes 3-Hf and 4 were determined by X-ray crystallography." @default.
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• W2041702905 date "2007-12-01" @default.
• W2041702905 modified "2023-10-16" @default.
• W2041702905 title "Reactions of Decamethylhafnocene with 1,3-Butadiynes: Formation of Hafnacyclocumulenes and C−H Activation at Pentamethylcyclopentadienyl Ligands" @default.
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• W2041702905 doi "https://doi.org/10.1021/om700911a" @default.
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