Synthesis and Structure of Intramolecularly Hydrogen Bonded Dendrons
摘要:
[GRAPHICS]A convenient synthesis of monodendrons whose conformation is restricted through the intervention of intramolecular hydrogen bonding and repulsive electrostatic interactions is described. X-ray crystal structure analysis of the second generation dendron shows the presence of a propeller-type secondary structure and indicates that the dendrons have assembled into a symmetrically interdigitated dimer in the solid state. H-1 NMR and IR spectral data are in agreement with the presence of intramolecular hydrogen bonding between the amides and the pyridine N throughout the dendron structure in solution.
Synthesis and Structure of Intramolecularly Hydrogen Bonded Dendrons
摘要:
[GRAPHICS]A convenient synthesis of monodendrons whose conformation is restricted through the intervention of intramolecular hydrogen bonding and repulsive electrostatic interactions is described. X-ray crystal structure analysis of the second generation dendron shows the presence of a propeller-type secondary structure and indicates that the dendrons have assembled into a symmetrically interdigitated dimer in the solid state. H-1 NMR and IR spectral data are in agreement with the presence of intramolecular hydrogen bonding between the amides and the pyridine N throughout the dendron structure in solution.
Effect of Terminal Group Sterics and Dendron Packing on Chirality Transfer from the Central Core of a Dendrimer
作者:Preete Gandhi、Baohua Huang、Judith C. Gallucci、Jon R. Parquette
DOI:10.1021/ol016409q
日期:2001.10.1
[structure: see text] The conformational properties of intramolecularly hydrogen-bonded dendrimers constructed from (S)-1,1'-bi-2-naphthol as a chiralcentralcore are described. Circular dichroism studies revealed that chirality transfer to the periphery occurs only when sterically demanding terminal esters are employed and when packing interactions are present.
Synthesis and Structure of Intramolecularly Hydrogen Bonded Dendrons
作者:Baohua Huang、Jon R. Parquette
DOI:10.1021/ol990250o
日期:2000.2.1
[GRAPHICS]A convenient synthesis of monodendrons whose conformation is restricted through the intervention of intramolecular hydrogen bonding and repulsive electrostatic interactions is described. X-ray crystal structure analysis of the second generation dendron shows the presence of a propeller-type secondary structure and indicates that the dendrons have assembled into a symmetrically interdigitated dimer in the solid state. H-1 NMR and IR spectral data are in agreement with the presence of intramolecular hydrogen bonding between the amides and the pyridine N throughout the dendron structure in solution.