作者:V. V. Kuznetsov、E. A. Alekseeva、V. V. Khudyakov、Yu. A. Levshov
DOI:10.1023/a:1015447702040
日期:——
H-1 NMR spectroscopy and MM+ and AM1 calculations were used for configurational assessment of stereoisomers of 4-methyl-2,5-disubstituted 1,3,2-dioxaborinanes (differing in the configuration of the ring C-4 atom). The molecules are conformationally inhomogeneous; this is due to the internal rotation of the substituent at the C-5 atom, while in the cis isomers, in addition, by the equilibrium between the S-4e5a and S-4a5e sofa conformations, shifted to the latter form.