NMR spectroscopic observation of a metal-free acetylide anion

Yoshiyuki Tanaka, Makoto Arakawa, Yohei Yamaguchi, Chieko Hori, Masahiro Ueno, Takeyuki Tanaka, Tatsushi Imahori, Yoshinori Kondo

研究成果: Article査読

10 被引用数 (Scopus)

抄録

A metal-free acetylide was observed by using NMR spectroscopy. Metal-free acetylides are closely related to reactive intermediates (carbanions) in solution; therefore, they have been regarded as unobservable species. However, we generated this highly reactive and unstable species through the deprotonation of phenylacetylene by using the strong nonmclallic phosphazene base tBu-P4. In the presence of tBu-P4, the J coupling between the ethynyl carbon and hydrogen nuclei (1JCH) of phenylacetylene disappeared: this indicates the deprotonation of the alkyne terminal. Furthermore, a large low-field shift (approximately 90 ppm) of the alkyne carbon resonance was observed. We concluded that we have observed a metal-free carbanion with a formal charge on an sp-hybridized carbon atom for the first time.

本文言語English
ページ(範囲)581-585
ページ数5
ジャーナルChemistry - An Asian Journal
1
4
DOI
出版ステータスPublished - 2006 11 9

ASJC Scopus subject areas

  • 生化学
  • 有機化学

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