Summary: A novel concept for performing a one-flask cyclopropanation of conjugated enones consists of conjugate addition of an appropriate phenylthio-stabilized organolithium compound followed by treatment of the resulting enolate anion with cuprous trifluoromethanesulfonate. The cyclopropanes generated by this procedure can be simple ones, substituted for example by silyl-and
![1-[2,2-bis(phenylsulfanyl)cyclopropyl]propan-1-one Structure](https://image.chemsrc.com/caspic/152/83300-59-8.png)