3-(2-phenylethyl)-2-cyclopentenone

1,4-dioxa-7-(2-phenylethyl)spiro<4.4>non-7-ene

7-allyl-7-(p-tolylsulfonyl)-1,4-dioxa-8-thiaspiro<4.5>-decane 8,8-dioxide

7-benzyl-7-(p-tolylsulfonyl)-1,4-dioxa-8-thiaspiro<4.5>-decane 8,8-dioxide

7-(2-phenylethyl)-7-(p-tolylsulfonyl)-1,4-dioxa-8-thiaspiro<4.5>-decane 8,8-dioxide