2',2'-dimethyl-4-(phenylsulfonyl)-3,7,8,9-tetrahydro-1H-spiro[benzo[8]annulene-2,5'-[1,3]dioxane]

9-(cyclobutylidenemethyl)-3,3-dimethyl-10-methylene-8-(phenylsulfonyl)-2,4-dioxaspiro[5.5]undec-8-ene

5,5-bis(3-chloroprop-2-yn-1-yl)-2,2-dimethyl-1,3-dioxane

1-(2,2-dimethyl-5-prop-2-ynyl-[1,3]dioxan-5-ynyl)-4-methyl-9-tri-methylsilyl-nona-2,8-diyn-4-ol