Layer-Block Dendrimers with Alternating Thienylenevinylene and Phenylenevinylene Units
摘要:
A series of new hybrid, layer-block pi-conjugated dendrons and dendrimers with alternating thienylenevinylene and phenylenevinylene units has been prepared by means of an orthogonal and convergent-growth methodology that made use of the Horner-Wadsworth-Emmons (HWE) reaction. The placement of the thiophene and benzene rings can be accurately controlled to afford a large variety of dendritic structures, although access to compounds of high generation proved difficult. The optical properties of the synthesized dendrimers were determined by UV/vis and fluorescence spectroscopy, and the influence of the generation and nature of the core on the behavior of these materials was evaluated.
Hydrostannation of Diyne and Triyne π-Electron Bridges: Efficient Stille Cross-Coupling of 1,3,5-Tris[(<i>E</i>)-2-(tributylstannyl)vinyl]benzene
作者:Sang Ook Kang、Jaejung Ko、Il Jung、Taegweon Lee
DOI:10.1055/s-2005-861822
日期:——
The facile hydrostannation of diynes and triynes with tributyltinhydride was achieved. The hydrostannation product readily underwent the Stille cross-coupling reaction with a variety of aryl bromides. The copper-mediatedStille cross-coupling of 1,3,5-tris[(E)-2-(tributylstannyl)vinyl]benzene with (E)-β-iodostyrene afforded the conjugated diene.