Synthesis and CD spectroscopy of polyethers with homochiral and heterochiral layers of stereocentres
摘要:
Eight polyethers with three to nine stereocentres have been synthesised using chiral base methodology. Examination of the polyethers by CD spectroscopy revealed clear differences between homochiral isomers and isorners with a heterochiral relationship between an 'inner' layer of stereocentres and an outer' layer of stereocentres. A hypothesis to account for these differences has been advanced. (C) 2008 Elsevier Ltd. All rights reserved.
Interplay between Core and Peripheral Chirality in Polyethers
摘要:
A chiral-base mediated reaction has been used to synthesise the polyethers illustrated and their enantiomers; CD spectroscopy revealed that the homochiral isomers A may be viewed as a C-3-symmetric arrangement of fixed paddles while the heterochiral isomers B form a C-3-symmetric arrangement of rotating paddles.