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Molecules 2007, 12(5), 1117-1124; doi:10.3390/12051117
Article

Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy

 and
*
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 / Revised: 13 May 2007 / Accepted: 14 May 2007 / Published: 24 May 2007
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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 NMR; HMBC; nJCH; pyrazolo[3; 4]pyran; proton-deficient compound
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Liu, X.; Cui, Y. Structure Elucidation of a Pyrazolo[3,4]pyran Derivative by NMR Spectroscopy. Molecules 2007, 12, 1117-1124.

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