Ene reactions of allylic derivatives of silicon, germanium, tin and lead with N-phenyltriazolinedione: the effect of varying the metal
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 10,p. 1743-1746
- https://doi.org/10.1039/p29920001743
Abstract
The compounds Ph3MCH2CHCH2 and Ph3M[graphicomitted]H2)3(M = Si, Ge, Sn or Pb) have been treated with 4-phenyl-1,2,4-triazoline-3,5-dione, and the relative yields of the products of the M-ene reaction, of the H-ene reaction, and of the reaction involving cycloaddition with shift of the organometallic substituent, have been determined. The silicon compounds react principally by the H-ene process. The cycloaddition process is at a maximum (50% or 70%) with the germanium compounds, and the tin compounds show mainly the M-ene reaction, with some cycloaddition but no H-ene reaction. Triphenylprop-2-enylplumbane [and di(prop-2-enyl)mercury and phenyl(prop-2-enyl)mercury] show only the M-ene reaction. In trimethyl(1,1-dimethylprop-2-enyl)silane, in which the H-ene reaction is blocked, only cyclo-addition with shift of the silyl group is observed.Keywords
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