Infrared spectroscopy and ab initio computation in conformer determination of keto ester and diketo triphenylphosphonium ylides
作者:Clifford A. Bunton、Fernando Castañeda
DOI:10.1016/j.molstruc.2009.07.028
日期:2009.11
fits for both keto ester and diketo ylides. For both methods agreement between observed and predicted frequencies is lowest for the syn – anti di- t -butyl keto ester ylide, although, unlike the situation for diester ylides, one bulky alkyl group does not significantly degrade the fits. Comparison of predicted and observed acyl stretching frequencies is useful in establishing conformations of these stabilized
摘要对于稳定的三苯基鏻酮酯叶立德,来自 HF/6-31G(d) 计算的抗酯基团的酰基拉伸频率与比例因子 SF = 0.866 拟合实验值,如早先估计的二酯叶立德,但比例因子 = 0.834 具有用于拟合合成酮组和合成 - 反二酮叶立德的数据。DFT 泛函 BLYP/6-31G(d),文献中的比例因子 = 0.9945,通常对酮酯和二酮叶立德都有很好的拟合。对于这两种方法,观察到的和预测的频率之间的一致性对于顺 - 抗二叔丁基酮酯叶立德是最低的,尽管与二酯叶立德的情况不同,一个庞大的烷基不会显着降低拟合度。