The ionizing power of liquid SO2 is sufficient to induce reactions between acetals or SN1‐active alkyl chlorides with allylsilanes without additional Lewis acids [Eq. (a), X OCH3, R PhCH(OCH3), n‐C6H13CH(OCH3), etc.; X Cl, R Ph3C, PhMe2C, etc.]. Reactions in liquid SO2 are economical and ecologically advantageous. An additional benefit: they are extremely simple to perform!
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Liquid Sulfur Dioxide as a Lewis-Acidic Solvent for the Alkylation and Alkoxyalkylation of Allylsilanes. -The investigations of alkylation reactions with alkyl chlorides suggest that only compounds with high SN1 reactivities such as (VIII) are reactive under these conditions. The use of liq. SO2 as solvent can replace metal halides as Lewis acids.-(MAYR, H.; GORATH, G.; BAUER, B.; Angew. Chem. 106 (1994) 7, 793-794; Inst. Org.
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