Abstract

The reaction of acetals with 2-(trimethylsiloxymethyl)allyltrimethylsilane under the influence of the combined use of a catalytic amount of tin(II) halide and acetyl halide affords the corresponding 2-aryl-4-methylenetetrahydrofurans in good yields. The reaction of aromatic acetals with 2-(trimethylsiloxymethyl)allyltrimethylsilane leads to 2-aryl-4-methylenetetrahydrofurans by tandem allylation-intramolecular cyclization.

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