1,4-Dihydronaphthalenes 2, 9, and 11 with a spiro-connected 1,3-dithiolane ring as well as tetrahydronaphthalenes 15, 17, and 19 have been obtained from o-quinodimethanes 3 and alkynes 4, naphthoquinones 10, or alkenes 14 and 16. Benzocyclobutenol 6 is not an appropriate quinodimethane precursor as it readily rearranges to phthalaldehyde derivative 7. However, silyl ether 8, silyl ether 13, obtained