Abstract
Abstract The 1, 4-addition of trialkylsilyl anions to 2-(phenylseleno)-2-cyclopenten-1-one affords trans cyclopentanone derivatives. A similar trans selectivty was observed in the protonation of enolates derived from phenylseleno-or phenylthiocyclopentenones by the addition of the vinyl anion corresponding to the prostaglandin ω-chain. On the other hand, the 1, 4-additions of trialkylsilyl and tributylstannyl anions to 2-(2-propenyl)-2-cyclopenten-1-one lead to a predominant formation of the cis compounds.
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