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Studies on the Mechanism of Allylmetal-Acetal Additions

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Part of the NATO ASI Series book series (ASIC,volume 289)

Abstract

The mechanism and stereochemical course of addition of allylsilanes and allylstannanes to acetals has been investigated. Using an intramolecular process to model the possible transition states the reaction stereochemistry has been shown to depend on the nature of the Lewis acid and acetal structure, but not on the allylmetal. Trimethylsilyl tritiate, triflic acid and BF3·OEt2 gave highly selective reactions while SnCl4 and TiCl4 did not. A spectroscopic investigation into the complexes formed between dimethyl acetals and various Lewis acids showed divergent results ranging from no observable complexation of the acetal with TMSOTf to complete, stoichiometry-dependent complexation with SnCl4. Finally, the duality of mechanism and its stereochemical consequences in reactions of acetals has been demonstrated. Using enol ethers as oxocarbenium ion precursors, the results show conclusively that the model dimethyl acetal does not react with TMSOTf via an oxocarbenium ion. As in classic nucleophilic aliphatic substitution, stereochemistry is used as a probe for differentiating SN1 and SN2 mechanisms in acetal reactions as well.

Keywords

  • Lewis Acid
  • Dimethyl Acetal
  • Mass Recovery
  • Enol Ether
  • Triflic Acid

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© 1989 Kluwer Academic Publishers

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Denmark, S.E., Wilson, T.M. (1989). Studies on the Mechanism of Allylmetal-Acetal Additions. In: Schinzer, D. (eds) Selectivities in Lewis Acid Promoted Reactions. NATO ASI Series, vol 289. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2464-2_13

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  • DOI: https://doi.org/10.1007/978-94-009-2464-2_13

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7611-1

  • Online ISBN: 978-94-009-2464-2

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