Bridge Flipping Data from Dynamic 1H‐NMR Spectra of 2,6‐Dimethyl‐[9](3,5)‐Pyridophane and its Pyrylium and N‐Methylpyridinium Analogs

Alexandru T. Balaban, Teodor‐Silviu ‐S Balaban, Makoto Nitta, Nobuhiro Kanomata

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Dynamic 1H‐NMR spectra between room temperature and −90 °C for the title compounds indicate that the flipping of the nonamethylene bridge is slowed down on cooling (ΔGc‡ = 9.8 kcal/mol for the 2/8 methylene groups in the pyridinophane with coalescence temperature Tc = −58 °C) but the pseudorotation persists even at −90 °C. The bridge flipping is somewhat easier in the N‐methylpyridinium (ΔGc‡ = 9.7 kcal/mol, Tc = −63 °C) and in the pyrylophanium perchlorates (ΔGc‡ = 8.9 kcal/mol, Tc = −78 °C).

本文言語English
ページ(範囲)1047-1051
ページ数5
ジャーナルBulletin des Sociétés Chimiques Belges
101
12
DOI
出版ステータスPublished - 1992

ASJC Scopus subject areas

  • Chemistry(all)

フィンガープリント 「Bridge Flipping Data from Dynamic <sup>1</sup>H‐NMR Spectra of 2,6‐Dimethyl‐[9](3,5)‐Pyridophane and its Pyrylium and N‐Methylpyridinium Analogs」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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