The organometallic chemistry of the alkaline-earth metals. Part 3. Preparation and properties of alkylhalogenometal compounds and related species of calcium, strontium, and barium
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 6,p. 657-664
- https://doi.org/10.1039/dt9780000657
Abstract
Alkyliodo-strontium and -barium compounds can be prepared in tetrahydrofuran (thf) solution at –78 °C in good yields, and solids of composition [MR(I)]·nthf (R = Me, Et, Prn, or Bun, M = Sr, n= 2 or 3; R = Et, M = Ba, n= 1) may be isolated. Characterisation of these products by analysis and other studies is reported. Co-condensation of alkyl halides with Ca, Sr, or Ba metal vapour at low temperature in vacuo gives products which contain solvent-free alkylhalogenometal species (10–25%) which are also investigated. Dicyclopentadienyl compounds, [M(cp)2](M = Ca, Sr, or Ba), and di-indenyl compounds, [M(C9H7)2](M = Sr or Ba), are prepared in high yield by co-condensation reactions. Reactions between various unsaturated organic molecules and iodo(methyl)-strontium and -barium compounds are reported and, except from Ph2CO, low yields of alkyl addition products are formed. The thermal decomposition of (ethyl)iodostrontium species produces a variety of hydrocarbon and other products, and studies on this system at 18 °C indicate the occurrence of some saturated C–C bond-cleavage reactions under mild conditions.Keywords
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