Experimental and theoretical investigations of absolute stereochemistry and chiroptical properties of enantiopure 2,2′-substituted 9,9′-bianthryls
作者:Shinji Toyota、Toshiaki Shimasaki、Naoki Tanifuji、Kan Wakamatsu
DOI:10.1016/s0957-4166(03)00252-0
日期:2003.6
The absolute stereochemistry of axially chiral 2,2′-X2-9,9′-bianthryls (X=COOH, COOMe, and Cl) was determined by X-ray analysis of the (+)-quinidine salt of the diacid to be (M)-(−) or (P)-(+). The M isomers of these compounds showed specific rotations of −115, −123, and −32, respectively, in acetone. The circular dichroism (CD) as well as UV spectra of the two M isomers (X=COOMe and Cl) were investigated
轴向手性的2,2'-X 2 -9,9'-双蒽基(X = COOH,COOMe和Cl)的绝对立体化学是通过对二酸的(+)-奎尼丁盐进行X射线分析确定的。 (M)-(-)或(P)-(+)。这些化合物的M异构体在丙酮中的比旋光分别为-115,-123和-32。借助时变DFT(TDDFT)方法,通过理论计算,研究了两个M异构体(X = COOMe和Cl)的圆二色性(CD)以及UV光谱。计算结果合理地再现了观察到的CD谱带,并暗示了p或β ′谱带的符号与绝对立体化学之间的相关性。