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û½Ó´¥¹ýÁ¿×Ó»¯Ñ§ÕâÒ»¿é£¬µ«ÂÛÎÄÄÚÈÝÓÖÉæ¼°µ½¾ø¶Ô¹¹Ð͵ļÆË㣬×Ô¼º³¢ÊÔ×Å·Ò룬µ«Ê²Ã´Ê²Ã´»ù×顢ʲôˮƽ¡¢Ê²Ã´ÀíÂ۵ȵȵIJ»ÖªµÀ¸ÃÈçºÎ·Ò룬¹ÊÇóרҵµÄ·Òë¡£ ECD Calculations. Calculated ECD spectra were obtained using the time-dependent density functional theory (TDDFT) employing the B3LYP functional using Gaussian 09, and were analyzed using GUIs GaussView (version 5.0). The calculations were performed at the HF/6-31G level in the gas phase for the initial optimization. The minimum geometries were fully optimized at the B3LYP/6-311G (d) level in the gas phase to yield more accurate conformers. The ECD spectra were simulated at the B3LYP/6-311G (d,p) level in methanol. The calculated ECD curves were generated using SpecDis with a ¦Ò of 0.2 eV. Absolute Configuration of XXX Enantiomers. The absolute configuration of a chiral molecule can could be deduced from its ECD spectrum. In this study, the TDDFT method was used to calculate the ECD spectra of XXX. By comparing the experimental ECD spectra to the calculated spectra, the absolute configurations of the XXX enantiomers were determined. The overall ECD curves obtained by the TDDFT calculations (Figure 2A) and those obtained experimentally (Figure 2B) were similar. In general, individual enantiomers exhibited specific CD signals at given wavelengths. The first eluted enantiomer was confirmed as the (¨C)-enantiomer, whereas the second enantiomer was the (+)-enantiomer, as noted by the region ranging from 200 nm to 500 nm (Figure 2B). Through the combination of computed and experimental ECD spectra, peak 1 and peak 2 in Figure 3 were assigned as S-(¨C)-XXX and R-(+)-XXX, respectively. |
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