Structure and conformational analysis of 2-hydroxy-5-isobutyl-1,3,2-dioxaborinane
作者:O. Yu. Valiakhmetova、T. V. Tyumkina、E. S. Meshcheryakova、L. M. Khalilov、V. V. Kuznetsov
DOI:10.1134/s1070363217010091
日期:2017.1
The structure of 2-hydroxy-5-isobutyl-1,3,2-dioxaborinane, one of the major autooxidation products of 5-isobutyl-2-isopropyl-1,3,2-dioxaborinane, has been studied by H-1, C-13, and B-11 NMR spectroscopy together with X-ray analysis. Molecules of the title compounds adopt a sofa conformation with equatorial isobutyl substituent. The ring interconversion path, free conformational energy, and optimal conformation of the isobutyl group (corresponding to the X-ray diffraction data) were determined by DFT quantum chemical calculations at the PBE/3 xi level of theory.