Chiral Memory in Silyl-Pyridinium and Quinolinium Cations

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Fernandes A., Laye C., Pramanik S., Palmeira D., ÖMÜR PEKEL Ö., Massip S., ...Daha Fazla

Journal of the American Chemical Society, cilt.142, sa.1, ss.564-572, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 142 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1021/jacs.9b11704
  • Dergi Adı: Journal of the American Chemical Society
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, EMBASE, MEDLINE, DIALNET
  • Sayfa Sayıları: ss.564-572
  • Ankara Üniversitesi Adresli: Evet

Özet

Copyright © 2019 American Chemical Society.Pyridine- and quinoline-stabilized silyl cations have been prepared, and their structure in condensed phases unambiguously assigned using 1H, 13C, 15N, 29Si, and 1H DOSY NMR as well as X-ray diffraction studies. Solid state structures thus show in both cases a stabilization of the cationic silicon center through an N-Si interaction and formation of a highly strained four-membered ring system. Chiral memory at the silicon atom in these heterocycle-stabilized silyl cations was also established, leading to various levels of selectivity depending on the nature of the heterocycle. Lowest energy conformations of the starting silanes obtained through DFT calculations, along with the isolation and characterization of the Si-centered chiral silyl cation intermediates, finally allowed to propose a plausible hypothesis as to the configurational stability of these silyl cations.