4.8 Article

Steric Effects Compete with Aryne Distortion To Control Regioselectivities of Nucleophilic Additions to 3-Silylarynes

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 34, Pages 13966-13969

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja306723r

Keywords

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Funding

  1. NIH-NIGMS [R01 GM090007]
  2. Boehringer Ingelheim
  3. DuPont
  4. Eli Lilly
  5. Amgen
  6. AstraZeneca
  7. Foote Fellowship
  8. Stauffer Charitable Trust
  9. University of California, Los Angeles
  10. National Science Foundation [CHE-0548209, CHE-1048804]
  11. National Center for Research Resources [S10RR025631]
  12. Direct For Mathematical & Physical Scien [1048804, 1059084] Funding Source: National Science Foundation
  13. Division Of Chemistry [1048804, 1059084] Funding Source: National Science Foundation

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We report an experimental and computational study of 3-silylarynes. The addition of nucleophiles yield ortho-substituted products as a result of aryne distortion, but meta-substituted products form predominately when the nucleophile is large. Computations correctly predict the preferred site of attack observed in both nucleophilic addition and cycloaddition experiments. Nucleophilic additions to 3-tert-butylbenzyne, which is not significantly distorted, give meta-substituted products.

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