## Abstract A new trifluoromethyl‐activated trifluoro monomer was successfully prepared by Pd‐initiated coupling of 1,3,5‐tribromobenzene with 4‐fluoro‐3‐trifluoromethylphenylboronic acid. 1,3,5‐Tris(4‐fluoro‐3‐trifluoromethylphenyl)benzene (**B**~**3**~) leads to several hyperbranched poly(arylene
A Convenient A2 + B3 Approach to Hyperbranched Poly(arylene oxindole)s
✍ Scribed by Mario Smet; Yu Fu; Xi Zhang; Etienne H. Schacht; Wim Dehaen
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 144 KB
- Volume
- 26
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: We developed a facile approach to hyperbranched polymers by applying a superelectrophilic reaction within an A~2~ + B~3~ strategy. A significant reactivity difference between the intermediate and the starting material was utilized to avoid gelation in the A~2~ + B~3~ polymerization. A number of hyperbranched poly(arylene oxindole)s were achieved in a one‐step polymerization and characterized by NMR spectroscopy and gel permeation chromatography. Moreover, further modifications at the interior and exterior of the resulting polymers were explored as well.
Structure of the hyperbranched polymers produced using the A~2~ + B~3~ approach.
magnified imageStructure of the hyperbranched polymers produced using the A~2~ + B~3~ approach.
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## Abstract Summary: Branched poly(arylene ether)s were prepared in an oligomeric A~2~ + B~3~ polymerization of phenol endcapped telechelic poly(arylene ether sulfone) oligomers as A~2~ and TFPPO as trifunctional monomer B~3~. The molar mass of the A~2~ oligomer significantly influenced the onset o
A Convenient Approach to Pentagonal 2,3':5',2"-Triheterocyclic Compounds. -Conjugate addition of 2-lithio-1,3-dithiane to 1,3-bis heterocyclic propenones (I) and following hydrolysis yields the ketoaldehydes (IV). They can be easily cyclized to the desired triheterocyclic title compounds (VI) and (