Mechanistical studies on C-H activation reactions of benzaldimines using selectively deuterated ligands: synthesis and crystal structures of [mu(2)-eta(3)-(R)N-CH2-C = C- C(H)= C(H)-C(H)= C(H)]Fe-2(CO)(6)
W. Imhof et al., Mechanistical studies on C-H activation reactions of benzaldimines using selectively deuterated ligands: synthesis and crystal structures of [mu(2)-eta(3)-(R)N-CH2-C = C- C(H)= C(H)-C(H)= C(H)]Fe-2(CO)(6), J ORGMET CH, 584(1), 1999, pp. 33-43
The reaction of Fe-2(CO)(9) with imine ligands derived from benzaldehyde le
ads to the formation of dinuclear iron cluster compounds of the general for
mula [mu 2-eta 3-N-CH2-C=C-C(H)=C(H)-C(H)]Fe-2(CO)(6) by a C-H activation/1
,3-hydrogen shift reaction sequence. Six cluster compounds with alkyl and a
ryl substituents bound to nitrogen have been synthesised and characterised,
five of them also by means of X-ray crystallography. The mechanism of the
reaction has been investigated by the use of ligands being selectively deut
erated in the 2-position. By several NMR experiments including deuterium sp
ectra it can be demonstrated that the hydrogen/deuterium atom of the activa
ted aromatic C-H bond is transferred to the former imine carbon atom produc
ing a methylene group instead and that this reaction strictly follows an in
tramolecular pathway. (C) 1999 Elsevier Science S.A. All rights reserved.