Activation of Unsaturated Organic Molecules by Dinuclear Fe-Pt Complexes
A. S. Mohamed, I. Jourdain et Mickael Knorr
The coordination and activation of unsaturated organic molecules [1] at heterodinuclear complexes still attracts considerable attention.[2] Notably insertion reactions into metal-carbon and carbon-carbon coupling reaction bonds represent fundamental reactions in organometallic chemistry, which also of importance as a key steps in homogenous catalysis. In this context, we are investigating the treatment of [Fe(CO)3(Ph2PXPPh2)(µ-CO)Pt(PPh3)] (1a X = CH2, 1b X = NH) with different types of functionalized alkynes leads to a complexe-alkyne coupling reaction affording an isomeric mixture of dimetallacyclopentenones. At 20°C, the kinetic isomer [(CO)2Fe(µ-Ph2PXPPh2)(µ-C(=O)CH=CR)Pt(PPh3)] (2’) is formed. However the thermodynamic isomer [(CO)2Fe(µ-Ph2PXPPh2)(µ-C(=O)CR=CH)Pt(PPh3)] (2”) is observed at 90°C. Protonation of dimetallacyclopentenones [3] results in the formation of alkenyl salts [(CO)3Fe(µ-dppm)(µ-CHR=CH)Pt(PPh3)][BF4]. Furthermore, the potential of the presence of a pendant terminal alkyne function for hydrosilylation reactions or complexation of other metal fragments to assemble polymetallic systems is under investigation.
1- M. Knorr et al.,Journal of Organometallic Chemistry, 2015, 780,70-85
2- V. Ritleng, M.J. Chetcuti, Chem. Rev. 2007, 107, 797-858
3- I. Jourdain et al., Organometallics 2013, 32, 5343−5359
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