Reactions of 1-Titana- and 1-Zirconacyclopent-3-ynes with Tris(pentafluorophenyl)borane

• Published in: Organometallics Vol. 24; no. 24; pp. 5916 - 5918
• Main Authors: Bach, Marc A, Beweries, Torsten, Burlakov, Vladimir V, Arndt, Perdita, Baumann, Wolfgang, Spannenberg, Anke, Rosenthal, Uwe, Bonrath, Werner
• Format: Journal Article
• Language: English
• Published: WASHINGTON American Chemical Society 21.11.2005; Amer Chemical Soc
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Chemistry, Organic; Physical Sciences; Science & Technology; ZIRCONOCENE; BIS(TRIMETHYLSILYL)ACETYLENE; TITANOCENE; 1,2,3-BUTATRIENE; COMPLEXES; B(C6F5)
• ISSN: 0276-7333; 1520-6041
• DOI: 10.1021/om0507880

The 1-metallacyclopent-3-ynes Cp2Ti(η4-H2C4H2) (1) (Cp = η5-cyclopentadienyl) and rac-(ebthi)Zr(η4-H2C4H2) (2) (ebthi = 1,2-ethylene-1,1‘-bis(η5-tetrahydroindenyl) react with B(C6F5)3 under ring opening of the metallacycle and formation of the zwitterionic complexes [Cp2Ti]+−CH2C⋮CCH2−[B-(C6F5)3] (3) and [rac-(ebthi)Zr]+−CH2C⋮CCH2−[B-(C6F5)3] (4). Crystal structures of 3 and 4 show a but-2-yne-1,4-diyl ligand bridging the metallocenium center and the formed boranate. Complex 4 is an active catalyst for ethylene polymerization.