From N-vinylpyrrolidone anions to modified paraffin-like oligomers via double alkylation with 1,8-dibromooctane: access to covalent networks and oligomeric amines for dye attachment

• Daniela Obels,
• Melanie Lievenbrück and
• Helmut Ritter

Beilstein J. Org. Chem. 2016, 12, 1395–1400, doi:10.3762/bjoc.12.133

• poly(ethylene glycol) side chains. Keywords: double alkylation; modified N-vinylpyrrolidone; oligomeric anthraquinone dye; paraffin-like oligomer; radical thiol-ene click reaction; Introduction Poly(N-vinylpyrrolidone) (PVP) is established in daily life due to its high water solubility and

• yielding paraffin-like oligomers 2a–c. Synthesis of the branched oligomeric dye 6: a) radical thiol–ene click reaction of 2a with 2-aminoethanethiol hydrochloride yielding 4. b) Subsequent reaction of 4 with DFA leading to red-colored oligomeric dye 5. c) Branching of 5 with Jeffamine® M 600 yielding blue