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Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy
State Key Laboratory of Nature and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100083, P. R. China
* Author to whom correspondence should be addressed.
Received: 12 April 2007; in revised form: 13 May 2007 / Accepted: 14 May 2007 / Published: 24 May 2007
Abstract: The structure of a representative pyrazolo[3,4]pyran derivative was determined by 1D and 2D NMR techniques. Complete 1H and 13C chemical shifts for this compound are reported. Careful analysis of the HMBC (Heteronuclear Multi-Bond Correlation) spectrum helped to elucidate the configuration of the derivative around C7 and C8. The results showed that the characteristic double-strong and double-weak cross peak pattern in the HMBC spectrum for C7 and C8 might be useful for establishing the structures of other pyrazolo[3,4]pyran derivatives.
Keywords: NMR; HMBC; nJCH; pyrazolo[3; 4]pyran; proton-deficient compound
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MDPI and ACS Style
Liu, X.; Cui, Y. Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy. Molecules 2007, 12, 1117-1124.
Liu X, Cui Y. Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy. Molecules. 2007; 12(5):1117-1124.
Liu, Xuehui; Cui, Yuxin. 2007. "Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy." Molecules 12, no. 5: 1117-1124.