I. Ahmad et al., Synthesis of silacycloalkenes and silaspirenes by Ru(II)-catalyzed ring-closing metathesis reactions, J ORGMET CH, 625(2), 2001, pp. 160-172
Cyclisation reactions of dienyl- and enynylsilanes by carbon-carbon bond fo
rmation under RCM conditions yield five-, six- and seven-membered silacyclo
alkenes. The relative ease of ring formation from dienes was in the order s
ix- > seven- > five-membered rings. A conjugated vinylsilacyclopentene was
formed from the corresponding enyne substrate. Silaspirenes have been prepa
red from silacarbacycles by the same methodology. Cyclisations effected und
er radical conditions gave complimentary silacycloheptane and silacyclohept
ene products. The ring closure proceeded by the endo-trig mute. (C) 2001 El
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