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2. Hussain, H. H.; Alhourani, B. J.; Al Alhabashna, M. Y. Unpublished results.
3. Crystal data for 3: Formula C12H16O0.5Si, MW=196.34, triclinic, space group P1 (no.1), a=6.038 (2), b=9.898(2), c=10.640(2) Å, α=108.49(3), β=103.01(3), γ=103.23(3)°, U=555.7(2) Å3, Z=2, Dc=1.173 Mg/m3, μ(Mo-kα)=0.171mm−1, F(000)=212, crystal size=0.35×0.125×0.125 mm, T=150(2) K. Intensity data were collected on a Nonius KappaCCD area detector diffractometer. The structure was solved by direct methods and refined on F2 by full-matrix least-squares (non-H anisotropic, H-atoms isotropic) to final R1=0.0397 and wR2=0.1253 for 3999 unique data and 251 parameters. Full details have been deposited with the Cambridge Crystallographic Data Centre (CCDC141103).
4. Padwa, A.; Austin, D. J.; Xu, S. L. Tetrahedron Lett. 1991, 32, 4103.
5. Baird, M. S.; Hussain, H. H. Tetrahedron Lett. 1986, 27, 5143.