REGIOSELECTIVE ALKYLATION AND THE RAMBERG–BÄCKLUND TYPE REACTION OF α-(<i>p</i>-TOLYLSULFONYL)THIANE<i>S</i>,<i>S</i>-DIOXIDE. A NEW ROUTE TO THE SYNTHESIS OF 3-ALKYL-3-CYCLOPENTENONES
A new general olefin synthesis, viaregioselective alkylation of α-(p-tolylsulfonyl)thiane S,S-dioxide, 1,4-dioxa-7-p-tolylsulfonyl-8-thiaspiro[4.5]decane 8,8-dioxide, and subsequent Ramberg–Backlund type elimination of p-toluenesulfinate and SO2, is here applied to the synthesis of 3-alkyl-3-cyclopentenones.