A Convergent Route to Enantiomerically Pure Higher [n?2]Triangulanedimethanol Derivatives and [n]Triangulanes (n?7)
作者:Armin de Meijere、Alexander F. Khlebnikov、Sergei I. Kozhushkov、Kazutoshi Miyazawa、Daniel Frank、Peter R. Schreiner、B. Christopher Rinderspacher、Dmitrii S. Yufit、Judith A. K. Howard
DOI:10.1002/anie.200461166
日期:2004.12.3
Syntheses and Properties of Enantiomerically Pure Higher (n ≥ 7) [n−2]Triangulanedimethanols and σ-[n]Helicenes
作者:Armin de Meijere、Alexander F. Khlebnikov、Sergei I. Kozhushkov、Dmitrii S. Yufit、Olga V. Chetina、Judith A. K. Howard、Takuya Kurahashi、Kazutoshi Miyazawa、Daniel Frank、Peter R. Schreiner、B. Christopher Rinderspacher、Mari Fujisawa、Chiyo Yamamoto、Yoshio Okamoto
DOI:10.1002/chem.200600111
日期:2006.7.24
lower members (n=4, 5) of the sigma-[n]helicenes. For the higher ones (n=7, 9, 15) the computed specific rotations turn out increasingly larger than the experimental values. The remarkable increase of the specific rotation with an increasing number of three-membered rings is proportional neither to the molecular weight nor to the number of cyclopropane rings in these sigma-[n]helicenes.