Synthesis and duplex formation of the reverse amidohelicene tetramer
摘要:
The reverse amidohelicene (P)-tetramer containing (P)-helicenediamine and m-phenylenedicarboxylate was synthesized. The circular dichroism (CD) and vapor pressure osmometry (VPO) analysis revealed the dimeric aggregate formation in THF. It is notable that the reverse amide tetramer formed a duplex, as well as the original amidohelicene oligomers. In various solutions, mixtures of the reverse (P)-tetramer and amidohelicene (P)/(M)-tetramer formed homoaggregates instead of heteroaggregates. (C) 2011 Elsevier Ltd. All rights reserved.
The reverse amidohelicene (P)-tetramer containing (P)-helicenediamine and m-phenylenedicarboxylate was synthesized. The circular dichroism (CD) and vapor pressure osmometry (VPO) analysis revealed the dimeric aggregate formation in THF. It is notable that the reverse amide tetramer formed a duplex, as well as the original amidohelicene oligomers. In various solutions, mixtures of the reverse (P)-tetramer and amidohelicene (P)/(M)-tetramer formed homoaggregates instead of heteroaggregates. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of Symmetrical Polynitrohelicenes and Their Chiral Recognition in the Charge Transfer Complexation
former compound is converted to a 2,4,9,11-tetranitrohelicene. The tetranitrohelicenes form charge-transfer (CT) complexes with an electron-rich chiral diaminohelicene in solution. The studies on the chiralrecognition reveal that the combinations of the same configuration of the helicenes form more stable complexes than that of the enantiomeric helicenes.