Conformational Studies of <i>ortho</i>-Substituted Benzaldehyde Chromium Tricarbonyl Complexes
作者:Sandrine Pache、Patrick Romanens、E. Peter Kündig
DOI:10.1021/om0206397
日期:2003.1.1
The syn/anti conformational equilibrium of o-substituted benzaldehyde chromiumtricarbonyl complexes was studied by CD and 1H NMR (NOE). The preferred conformation of the o-methyl-, o-methoxy-, and o-iodobenzaldehyde complexes is anti, while those of the o-trimethyltin and o-trimethylsilyl benzaldehyde complexes is syn. The optical rotation values of (o-trimethylsilyl benzaldehyde)Cr(CO)3 ((1S)-2d)
通过CD和1 H NMR(NOE)研究了邻取代的苯甲醛三羰基铬铬羰基配合物的顺式/反式构象平衡。邻-甲基-,邻-甲氧基-和邻-碘联苯甲醛配合物的优选构象是反式,而邻-三甲基锡和邻-三甲基甲硅烷基苯甲醛配合物的构象是顺式。(所述的光学旋转值邻-三甲基甲硅烷苯甲醛)的Cr(CO)3((1个小号) - 2d中)改变从-174(在乙醇中)到108(在氯仿中)。