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Sterically Demanding Hetero‐Substituted [2]Borametallocenophanes of Group IV Metals: Synthesis, Structure and Reactivity
Author(s) -
Braunschweig Holger,
Dörfler Rainer,
Mies Jan,
Oechsner Andreas
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201101774
Subject(s) - steric effects , reactivity (psychology) , group (periodic table) , chemistry , stereochemistry , organic chemistry , medicine , alternative medicine , pathology
We report the synthesis and characterisation of unprecedented unstrained [2]diborametallocenophanes of zirconium and hafnium that bear the bulky octamethylfluorenyl (η 5 ‐C 29 H 36 ) system, the proligands of which were pre‐constructed by a two‐step synthesis. The compounds were fully characterised by NMR spectroscopy, MALDI‐TOF mass spectrometry and X‐ray diffraction analysis. Typical reactivities relevant to olefin polymerisation such as methylation and chloride abstraction were also investigated. Finally, a sterically demanding bis(octamethylfluorenyl) metallocene was prepared.