Quantitative Determination of Conformer Populations: Assessment of Specific Rotation, Vibrational Absorption, and Vibrational Circular Dichroism in Substituted Butynes
作者:Jiangtao He、Ana Petrovich、Prasad L. Polavarapu
DOI:10.1021/jp030889g
日期:2004.3.1
agreement between the observed and predicted properties of specific rotation, vibrational absorption, and vibrational circular dichroism (VCD), (+)-3-chloro-1-butyne, which is one of the smallest single conformer chiral molecules, has been synthesized for the first time and its intrinsic rotation (specific rotation at infinite dilution), vibrational absorption, and VCD have been measured. These properties
为了评估观察到的和预测的比旋转、振动吸收和振动圆二色性 (VCD) 特性之间的定量一致性,(+)-3-chloro-1-butyne 是最小的单一构象手性分子之一,具有首次合成并测量了其固有旋转(无限稀释时的比旋转)、振动吸收和 VCD。还使用密度泛函理论 (DFT) 和大型基组(即 aug-cc-pVDZ、6-311++G(2d,2p) 和 aug-cc-pVTZ)预测了这些特性。使用这些实验和预测的特性,(+)-3-chloro-1-butyne 的绝对构型被确定为 (R)。观察到的固有旋转和预测的比旋转具有极好的定量一致性。预测的振动吸收和VCD光谱与相应的观察光谱具有很好的定性一致性;然而,综合意图的均方根百分比差异...