title: An indolocarbazole dimer as a new stereodynamic probe for chiral 1,2-diamines.
abstract: An indolocarbazole dimer that contains aldehyde groups at both ends was prepared by connecting two monomeric units through a rod-like 1,4-butadiynyl spacer. Upon mixing with chiral 1,2-diamines at room temperature, the dimer was in situ converted to the corresponding cyclic diimines in the presence of tetrabutylammonium acetate as a template. The resulting diimines fold to helical conformations of right-handed (P) or left-handed (M) orientations, depending on the absolute stereochemistries of chiral 1,2-diamines. The patterns and intensities of the CD spectra can be used to determine the absolute configurations and enantiomeric excesses of chiral 1,2-diamines.
authors.affiliation: Department of Chemistry, Yonsei University, Seoul 120-749, Korea. ksjeong@yonsei.ac.kr.
authors.forename: Hae-Geun
authors.initials: HG
authors.lastname: Jeon
authors.forename: Min Jun
authors.initials: MJ
authors.lastname: Kim
authors.forename: Kyu-Sung
authors.initials: KS
authors.lastname: Jeong