Several novel organoruthenium complexes
[Cp*Ru(η6-arene)][CF3SO3]
(3, 4, 6) were
prepared in which the arene unit possesses an alkyl chain terminated
with carboxylic acid,
ester, and activated ester functions. These compounds were fully
characterized by spectroscopic methods, and in particular, the activated ester complex
[Cp*Ru(η6-MeOC6H4(CH2)2COONS)][CF3SO3] (6) (NS
= N-succinimidyl) was identified by X-ray analysis.
The reactivity
of 6 with respect to benzylamine and β-alanine ethyl ester
was examined and afforded
quantitatively the stable conjugates
[Cp*Ru(η6-MeOC6H4CH2CH2CONHCH2Ph][CF3SO3]
(7)
and
[Cp*Ru(η6-MeOC6H4(CH2)2CONH(CH2)2COOEt][CF3SO3]
(8). Furthermore, the stability
and reactivity of 6 relative to the analogous dicationic
organoiridium complex [Cp*Ir(η6-MeOC6H4(CH2)2COONS)][BF4]2
(10) and the neutral metallocarbonyl derivatives of the
type
[L
n
MCpCOONS]
(12−14) [L
n
M =
Fe(CO)2Me, Mo(CO)3Me,
Co(CO)2] are presented and
discussed.
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