• Title/Summary/Keyword: Diastereotopic methylene

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Application of Pulsed Field Gradient Long-range COSY-NMR for the Assignment of Geminal Protons on Rigid System: supplemental method of NOE Experiment (NOE 실험의 대용으로 응용될 수 있는 PFG Long-range COSY NMR 실험)

  • Lee, Sueg-Geun
    • Analytical Science and Technology
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    • v.18 no.1
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    • pp.85-88
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    • 2005

  • Antiphase character of cross peaks in long-range COSY is modulated by changing the fixed delay time and used to assign diastereotopic methylene protons on rigid systems which could produce unpredictable NOE phenomena because of complicate coupling spins.

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Diastereotopic $^1H-NMR$ Spectrum of Ethyl Octahydro-2,3-dioxo-6a-hydroxy-1-benzyl-cyclopenta[b]pyrrole-3a-carboxylate (Ethyl Octahydro-2,3-dioxo-6a-hydroxy-1-benzyl-cyclopenta[b]pyrrole-3a-carboxylate의 부분입체이성질성 핵자기공명 스펙트럼)

  • 김동우;김태흥;박영규;윤경원;서원준
    • YAKHAK HOEJI
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    • v.39 no.2
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    • pp.205-209
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    • 1995

  • Methylene protons of benzyl and ethyl ester in ethyl 1-benzyl-2, 3-dioxo-cyclopenta[b]-pyrrole-3a-carboxylate (A) exhibited opposite$^{1}$H-NMR spectral patterns mutually between magnetic equivalence and nonequivalence depending on concentration and temperature. The diastereotopic spectral data of compound A were reported with brief interpretation.

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