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Cationic ansa ‐(η 5 ‐Cyclopentadienyl)(η 6 ‐arene) Complexes of Titanium
Author(s) -
Deckers Patrick J. W.,
van der Linden Arjan J.,
Meetsma Auke,
Hessen Bart
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200005)2000:5<929::aid-ejic929>3.0.co;2-7
Subject(s) - chemistry , cyclopentadienyl complex , lewis acids and bases , titanium , transition metal , solvent , ionic bonding , cleavage (geology) , stereochemistry , medicinal chemistry , organic chemistry , catalysis , ion , geotechnical engineering , fracture (geology) , engineering
The half‐sandwich titanium trimethyl complex (η 5 ‐C 5 H 4 CMe 2 Ar)TiMe 3 (Ar = 3,5‐Me 2 C 6 H 3 ) reacts with the Lewis acid B(C 6 F 5 ) 3 to give the ionic Ti IV ansa ‐cyclopentadienyl‐arene complex [(η 5 ,η 6 ‐C 5 H 4 CMe 2 Ar)TiMe 2 ][MeB(C 6 F 5 ) 3 ]. In bromobenzene solvent, addition of more B(C 6 F 5 ) 3 leads to C 6 F 5 /Me exchange and, subsequently, to formation of an unusual dimeric Ti III dicationic species, {[(η 5 ,η 6 ‐C 5 H 4 CMe 2 Ar)Ti(μ‐Br)] 2 }[B(C 6 F 5 ) 4 ] 2 , which was structurally characterized. Its formation involves reduction of the transition‐metal center, solvent C–Br cleavage and perfluoroaryl‐group scrambling.