da Costa Resende G, Alvarenga ES. Structural elucidation of dioxa-cage compounds from tetrahydroisobenzofuran-1(3H)-one: analysis of NMR data and GIAO chemical shifts calculations.
MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016;
54:968-974. [PMID:
27391981 DOI:
10.1002/mrc.4483]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 06/20/2016] [Accepted: 07/04/2016] [Indexed: 06/06/2023]
Abstract
The polycyclic compounds, especially the dioxa-cages, have attracted considerable attention in recent years. In our work, a series of 9β-substituted 3-oxo-4,11-dioxatetracyclo[5.2.1.15,8 .02,6 ]undecane compounds were unexpectedly isolated during bromination, chlorination and epoxidation reactions of the 3-hydroxy-3a,4,7,7a-tetrahydro-4,7-methanoisobenzofuran-1(3H)-one. After careful analysis of the NMR data, the chemical shifts of the isolated and the expected products were predicted by theoretical calculations using density functional theory and gauge including atomic orbitals. The best correlation between calculated and experimental data was evaluated by comparing mean absolute errors and applying DP4 probability methodology. Results from both approaches indicated a correct structural elucidation. Copyright © 2016 John Wiley & Sons, Ltd.
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