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Substituted Ferrocenylboranes – Potential Ligand Precursors for ansa‐ Metallocenes, Constrained Geometry Complexes and ansa‐Diamido Complexes
Author(s) -
Braunschweig Holger,
Breitling Frank M.,
Kraft Katharina,
Kraft Mario,
Seeler Fabian,
Stellwag Sascha,
Radacki Krzysztof
Publication year - 2006
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200500365
Subject(s) - chemistry , ligand (biochemistry) , cyclopentadienyl complex , stereochemistry , medicinal chemistry , crystallography , catalysis , organic chemistry , receptor , biochemistry
A wide range of potential ligand precursors and related compounds have been synthesized from ferrocenyldibromoborane and ferrocenylenebis(dibromoborane) via salt elimination reactions. These comprise ligand precursors suitable for the preparation of (i) ansa‐metallocenes such as [FcB( η 1 ‐C 5 H 5 ) 2 ] ( 2 ), [FcB(1‐C 9 H 7 ) 2 ] ( 3 ), [FcB(3‐C 9 H 7 ) 2 ] ( 4 ) and [1,1′‐fc{B(3‐C 9 H 7 ) 2 } 2 ] ( 11 ), (ii) constrained geometry complexes such as [FcB(1‐C 9 H 7 )N(H)Ph] ( 7 ) and [FcB(3‐C 9 H 7 )N(H)Ph] ( 8 ), (iii) ansa‐diamido complexes such as [FcB(N(H)Ph) 2 ] ( 9 ) as well as (iv) the related compounds [FcB(Br)N(H) t Bu] ( 5 ), [FcB(Br)N(H)Ph] ( 6 ), [1,1′‐fc{B(Br)N(SiMe 3 ) 2 } 2 ] ( 12 ) and [1,1′‐fc{B(Br)N i Pr 2 } 2 ] ( 13 ) (Fc = ferrocenyl, fc = ferrocenylene, C 5 H 5 = cyclopentadienyl, C 9 H 7 = indenyl). All new compounds have been characterised by multinuclear NMR spectroscopic techniques and in the case of 7 and 12 by X‐ray diffraction methods.