483986-78-3Relevant academic research and scientific papers
Synthesis and solid-state organization of coil-ring-coil block copolymers
Rosselli, Silvia,Ramminger, Anne-Desiree,Wagner, Thomas,Lieser, Guenter,Hoeger, Sigurd
, p. 3481 - 3491 (2007/10/03)
Shape-persistent macrocycles based on the phenyl-ethynyl-butadienyl backbone containing two extraannular hydroxyl groups were prepared by the oxidative coupling of the appropriate phenylethynyl oligomers. Carbodiimide-directed coupling with independently synthesized polystyrene carboxylic acid oligomers led to ABA coil-ring-coil block copolymers in which the central macrocycle serves as rigid and the polystyrene oligomers as flexible elements. Depending on the size of the coil blocks, these structures aggregate in cyclohexane into supramolecular hollow cylindrical brushes in which the rigid core is surrounded by the flexible matrix. However, in the solid state it is not possible to identify a morphology in which isolated channels based on aggregated macrocycles are embedded in a matrix of polystyrene. Detailed X-ray and electron diffraction studies on samples prepared from a solution in cyclohexane under equilibrium conditions show that the material adopts a lamellar morphology in the solid state in which columns of macrocycles are aggregated into layers which are separated by polystyrene.
A facile synthesis of large extraannular-functionalized phenyl-ethynyl macrocycles containing m-terphenyl units
Hoeger, Sigurd,Rosselli, Silvia,Ramminger, Anne-Desiree,Enkelmann, Volker
, p. 4269 - 4272 (2007/10/03)
(equation presented) Two large extraannular-functionalized phenyl-ethynyl macrocycles containing m-terphenyl units are described. The synthesis of the m-terphenyl building blocks is based on the transformation of pyrylium salts to arenes.
