ChemInform Abstract: Iterative Dianion Relay Along the Ring: Formation of gem-Bis(trimethylsilyl) Cyclopentenones from 2,5-Bis(trimethylsilyl) Oxycyclopentadienyl Dianions and Acid Chlorides

Reaction of dilithiobutadienes like (I) with aroyl chlorides containing electron-withdrawing groups (III) proceeds with C—C bond formation and double silyl shift to give gem-bis(trimethylsilyl)cyclopentenones (IV) in good yields.