A new synthesis of soluble poly(1,4-phenylenevinylene)s and poly(2,5-pyrimidinylenevinylene)s

Discordant lymphatic drainage patterns revealed by serial lymphoscintigraphy in cutaneous head and neck malignancies

“…The syntheses of compound 3 and 4 followed the literature 35, 36. Compound 3 was synthesized from 2 and aniline, and the completion of the reaction was confirmed by thin‐layer chromatography (TLC; disappearance of the aniline spot).…”

Supramolecular self-assembly and opto-electronic properties of semiconducting block copolymers

“…Although the oligomer route has the advantage of exact control of end-groups and molecular weight, it is extremely time-consuming for higher molecular weight polymers. Hence, we use the Siegrist [75,76] polycondensation technique, originally described by Kretzschmann and Meier [77,78], to obtain PPV blocks with exactly one aldehyde end-group. The subsequent attachment of the initiator to the rigid PPV block occurs via the nucleophilic attack of a Grignard reagent to the aldehyde group.…”

Pentadecamer 2,5-Dipropoxy-1,4-phenylenevinylene

“…[17] Applied to the 2,5-dipropoxy system, a polymer 1pЈЈ was obtained via the non-isolable prepolymer 20. The number of repeat units n amounted to 29Ϫ30 (NMR endgroup determination).…”

“…1 PPV: The PPVs were prepared from 15, [14,22] 16 [15,16,22] and 17 [3,17] according to the literature. The red materials 1pЈ, 1p and 1pЈЈ gave in CHCl 3 slightly different UV/Vis spectra Ϫ as shown above Ϫ and very similar 13 C NMR spectra in the solid state: δ ϭ 10.8Ϫ11.1 (CH 3 ), 23.4Ϫ23.8 (CH 2 ), 70.2Ϫ71.0 (OCH 2 ), 107.0Ϫ108.5 (aromat.…”