The First Spiroconjugated TTF- and TCNQ-Type Molecules: A New Class of Electroactive Systems?
摘要:
Spiroconjugated TTF-type electron donors (13a-c) and TCNQ-type electron acceptors (10, 11) have been prepared from spiroquinone 9. Cyclic voltammetry reveals a relatively weak accepting ability for 10 and 11, and a strong electron-donor character for 13a-c. Whereas the spiroconjugation introduces a destabilization of the LUMO for compounds 9-11, the opposite is observed for compound 13. thus justifying the redox potential values.
Resolution and absolute configuration of the enantiomeric spiro[5.5]undecane-3,9-diols
作者:Gundula Voß、Hans Gerlach
DOI:10.1016/s0957-4166(00)86214-x
日期:1994.3
The enantiomerically pure spiro[5.5]undecane-3,9-diols (−)-1 and (+)-1, have been prepared via the diastereomerically pure esters (−)-2 or (+)-2 made from (±)-1 and (1S,4R)- or (1R,4S)-camphanoyl chloride. The bis(4-methoxybenzoate) (+)-3 and bis(4-bromobenzoate) (+)-4 derived from (−)-1 show chiroptical properties in accordance with Nakanishi's rule for two chromophores having coupled electric dipole