Metal carbonyl chemistry. Part XXVI. Preparation, spectroscopic properties, and mode of decomposition of some halogenoethylene complexes of tetracarbonyliron, and the reaction of nonacarbonyldi-iron with lodotrifluoroethylene
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 18,p. 1867-1872
- https://doi.org/10.1039/dt9750001867
Abstract
Nonacarbonyldi-iron reacts under very mild conditions with a range of halogenoethylenes to give complexes of the form [(olefin)Fe(CO)4][olefin = CH2:CHF, CH2:CF2, CHF:CF2, CHBr:CF2, CHCl:CF2, CF3·CF:CF·CF3, CF3·CH:CH·CF3(CF3)2C:C(CF3)2, CCl2:CCl2, etc.]. Thermal decomposition gives the original olefin and pentacarbonyliron; traces of the geometric isomer of the olefin {e.g. cis-CF3·CH:CH·CF3 from the complex [(trans-CF3·CH:CH·CF3)Fe(CO)4]} may arise via an intermediate zwitterion in which rotation about the original double-bond is possible. The spectroscopic properties of the complexes are more in accord with the ‘ferracyclopropane’ model structure than the ‘complexed olefin’ structure. Trifluoroiodoethylene reacts anomalously with nonacarbonyldi-iron to give a dimer [{(C2F3I)Fe(CO)4}2], of unknown structure, and a low yield of tetracarbonyliodo(trifluorovinyl)iron.Keywords
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