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The reactivity of donor‐acceptor (D‐A) cyclopropanes towards thioketenes was investigated. In a (3+2)‐cycloaddition using Sc(OTf)3 as a Lewis acidic catalyst, the corresponding exocyclic thioenol ethers (2‐methylidene tetrahydrothiophenes) were formed in moderate to good yields. Unsymmetrical thioketenes provided E/Z mixtures at the double bond, with the Z isomer being preferred.
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