Synthesis and separation of the atropisomers of 2-(5-benzo[b]fluorenyl)-2′-hydroxy-1,1′-binaphthyl and related compounds
摘要:
Several syn and anti atropisomers of 2-(5-benzo[b]fluorenyl)-2'-hydroxy-1,1'-binaphthyl and related compounds were synthesized from 1,1'-binaphthyl-2,2'-diol (BINOL). It was possible to separate the syn and anti atropisomers by silica gel column chromatography. The syn atropisomers are potential hetero-bidentate ligands for complex formation with metals. By starting from enantiomerically pure (R)-(+)-BINOL and (S)-(-)-BINOL, four optically active syn atropisomers and two anti atropisomers with high enantiomeric purity were obtained. The structures of two syn atropisomers and one anti atropisomer were established by X-ray structure analyses. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and separation of the atropisomers of 2-(5-benzo[b]fluorenyl)-2′-hydroxy-1,1′-binaphthyl and related compounds
摘要:
Several syn and anti atropisomers of 2-(5-benzo[b]fluorenyl)-2'-hydroxy-1,1'-binaphthyl and related compounds were synthesized from 1,1'-binaphthyl-2,2'-diol (BINOL). It was possible to separate the syn and anti atropisomers by silica gel column chromatography. The syn atropisomers are potential hetero-bidentate ligands for complex formation with metals. By starting from enantiomerically pure (R)-(+)-BINOL and (S)-(-)-BINOL, four optically active syn atropisomers and two anti atropisomers with high enantiomeric purity were obtained. The structures of two syn atropisomers and one anti atropisomer were established by X-ray structure analyses. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and structures of helical polycyclic aromatic hydrocarbons bearing aryl substituents at the most sterically hindered positions
作者:Yanzhong Zhang、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1016/j.tet.2007.11.073
日期:2008.2
polycyclic aromatic hydrocarbons bearing one or two aryl substituents at the most sterically hindered positions to cause helical twists. The dynamic behaviors involving the helix inversion and the restricted rotation of the aryl substituents were investigated by temperature-dependent NMR studies. The X-ray structure of an indeno-fused 1-phenylpentahelicene derivative showed severe distortion of the [5]helicene
Synthesis and separation of the atropisomers of 2-(5-benzo[b]fluorenyl)-2′-hydroxy-1,1′-binaphthyl and related compounds
作者:Hua Yang、Jeffrey L. Petersen、Kung K. Wang
DOI:10.1016/j.tet.2006.06.004
日期:2006.8
Several syn and anti atropisomers of 2-(5-benzo[b]fluorenyl)-2'-hydroxy-1,1'-binaphthyl and related compounds were synthesized from 1,1'-binaphthyl-2,2'-diol (BINOL). It was possible to separate the syn and anti atropisomers by silica gel column chromatography. The syn atropisomers are potential hetero-bidentate ligands for complex formation with metals. By starting from enantiomerically pure (R)-(+)-BINOL and (S)-(-)-BINOL, four optically active syn atropisomers and two anti atropisomers with high enantiomeric purity were obtained. The structures of two syn atropisomers and one anti atropisomer were established by X-ray structure analyses. (c) 2006 Elsevier Ltd. All rights reserved.