Reactivity of iron(II) non-classical hydrides with alkynes
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 22,p. 3203-3208
- https://doi.org/10.1039/dt9920003203
Abstract
The complex [FeH(η2-H2){PPh(OEt)2}4]BPh4 reacts with terminal alkynes HCCR (R =p-tolyl, But or SiMe3) to give the corresponding alkenes H2CCHR and the butenynyl derivative [Fe(η3-RC3CHR){PPh(OEt)2}4]+. In contrast, the related complex [FeH(η2-H2){P(OEt)3}4]BPh4 reacts with terminal alkynes to yield alkenes and σ-acetylide [Fe(CCR){P(OEt)3}5]+ derivativs. Activated alkynes such as HCCCO2Me and MeO2CCCCO2Me react with both [FeH(η2-H2)L4]BPh4[L = P(OEt)3 or PPh(OEt)2] to give vinyl derivatives [Fe{CHCH(CO2Me)}L4]+ and [Fe{C(CO2Me)CH(CO2Me)}L4]+, respectively. The characterization of the complexes by IR, 1H, 13C and 31P NMR spectroscopy is discussed.Keywords
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