Hörmann F, Hirsch A (2013)
Publication Type: Journal article, Original article
Publication year: 2013
Original Authors: Hörmann F., Hirsch A.
Publisher: Wiley-VCH Verlag
Book Volume: 19
Pages Range: 3188-3197
Journal Issue: 9
We report here on the facile synthetic access of a new family of bis-, tetra-, hexa-, and heptafullerenes (prototypes I-IV), which can be easily converted into very water soluble polyelectrolytes with up to 60 charges located on their periphery. Their very regioselective formation is based on the use of C-symmetrical pentakisadducts 3 and hexakisadducts 2 as key intermediates. All fullerene moieties incorporated in these macromolecular structures involve a complete or partial octahedral addition pattern. Tripod-shaped tetrafullerenes 9 a,b (type II), which can accumulate up to thirty positive or negative charges, are very soluble in acidic or basic water, respectively. Hexafullerenes 13 a,b (type III) were synthesized via isoxazolinofullerenes 10 followed by photolytic cleavage of the isoxazoline group. The giant heptafullerene 1 b (type IV) representing the anionic counterpart of the previously synthesized polyelectrolyte 1 a can store up to 60 negative charges on its periphery within a defined three-dimensional structure. We also discovered a new cyclopropanation reaction of C involving dibromomalonates and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). This reaction allows even for the highly regioselective formation of hexakisadducts with an octahedral addition pattern without requiring activation with reversibly binding addends such as 9,10-dimethylanthracene (DMA). On the shoulders of giants: A giant heptafullerene (see figure) is one of four new prototypes of large fullerene-based polyelectrolytes with a precisely defined structure. The key intermediates for the construction of these macromolecules were synthesized from the C-symmetrical pentakisadducts in excellent yields. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
APA:
Hörmann, F., & Hirsch, A. (2013). Giant fullerene polyelectrolytes composed of C60 building blocks with an octahedral addition pattern and discovery of a new cyclopropanation reaction involving dibromomalonates. Chemistry - A European Journal, 19(9), 3188-3197. https://doi.org/10.1002/chem.201203881
MLA:
Hörmann, Frank, and Andreas Hirsch. "Giant fullerene polyelectrolytes composed of C60 building blocks with an octahedral addition pattern and discovery of a new cyclopropanation reaction involving dibromomalonates." Chemistry - A European Journal 19.9 (2013): 3188-3197.
BibTeX: Download