置換エチレンジカチオン

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概要

• 論文の詳細を見る

• Cryoscopy and nuclear magnetic resonance (NMR) spectroscopy showed that the species formed from β-nitrostyrenes in trifluoromethanesulfonic acid (TFSA) are O, O-diprotonated dications (N, N-dihydroxyiminium benzyl dications). Further studies demonstrated that nitroethylene in TFSA yielded the N, N-dihydroxyiminium methylium dication, which is stabilized probably by Y-delocalization, consisting of six delocalized electrons (two π-electrons of the olefinic bond and four electrons of lone pairs of two hydroxy groups) in the whole system. From an alternative point of view, these dipositive systems can be regarded as substituted ethylene dications. The intervention of related substituted ethylene dications is proposed in the reaction of diphenylmethyl cations bearing a ketone or an ester group which gives the fluorenes and phenylphenanthrol in TFSA. Direct observations of 1,1-diaryl-2-hydroxy-2-methoxyethylene dications and 1,1,2-triaryl-2-hydroxyethylene dications by means of NMR spectroscopy supported the postulation.

• 公益社団法人日本薬学会の論文
• 1989-01-25

著者

• 首藤 紘一

  Facutly Of Pharmaceutical Sciences University Of Tokyo

• 大和田 智彦

  東大 薬

• 大和田 智彦

  東京大学薬学部

• 大和田 智彦

  Faculty of Pharmaceutical Sciences, University of Tokyo

• 首藤 紘一

  東京大・薬学

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