Unexpected carbon-carbon bond cleavage in the reactions of the pentagonal bipyramidal cluster Fe3(CO)6(μ-CO)234-{RCC(Et)C(Et)CR}] with styrene. Synthesis and X-ray structure of Fe3(CO)63- η4-{EtC2CR}]2 (R = CH3(=CH 2)

Giuliana Gervasio, Domenica Marabello, Enrico Sappa, Andrea Secco

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The thermal reactions of 2-methyl-1-hexen-3-yne [CH3CH 2C = +CC(=CH2)CH3, metey] with Fe 3(CO)12 have been studied: cluster opening or fragmentation and alkyne dimerization occur. Main products are the open triangular isomers [Fe3(CO)6(μ-CO)2{CH 3(=CH2)CC(Et)C(Et)C(=CH2)CH3}] (complex 3a) and [Fe3(CO)6(μ-CO)2{C(Et) CCH3(=CH2)C(Et)CCH3(=CH2)}] (complex 3b). The structure and isomerism of the complexes has been confirmed by X-ray studies. The minor products of the reaction have been characterized by spectroscopic techniques. An attempt at exploiting the reactivity of the "free" C=C bonds of the coordinated ene-yne was made: complex 3a was reacted with styrene under thermal conditions. Unexpectedly considerable yields of the closed triangular cluster [Fe3(CO)6{EtC 2C(=CH2)CH3}2] (complex 5) have been obtained. This behaviour had not been previously observed. The unprecedented structure of complex 5 has been confirmed with an X-ray study.

Lingua originaleInglese
pagine (da-a)197-208
Numero di pagine12
RivistaJournal of Cluster Science
Volume19
Numero di pubblicazione1
DOI
Stato di pubblicazionePubblicato - mar 2008
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