Neuere Methoden der präparativen organischen Chemie Synthesen mit Hilfe von Pyridinium‐Salzen

Abstract

Es werden die Synthesen besprochen, die zii N-Vinylpyridiniuni

Reduction of Self-Quenching Effect in Organic Electrophosphorescence Emitting Devices via the Use of Sterically Hindered Spacers in Phosphorescence Molecules

“…Synthesis of Ligand 1: Ligand 1 was synthesized using Krohnke condensation method [13,14]. In a 100 mL round bottom flask charged with 40 mL pyridine, acetophone (3.84 g, 32 mmol) and iodine (8.12 g, 32 mmol) were added.…”

Synthesis of New Non‐Symmetrical Substituted 7,7′‐Bisindolizines by the Direct Reaction of 4,4′‐Bipyridinium‐ylides with Dimethyl Acetylenedicarboxylate.

“…Heterocyclic compounds, namely indolizines, have been synthesized by the 3+2 dipolar cycloaddition of isolated non-symmetrical substituted 4-(4'-pyridyl)-pyridiniumbis-ylides 13b-18b with dimethyl acetylenedicarboxylate (DMAD). Thus, to prepare compounds 13-18 we synthesized monoquaternary salts 1-6 using previously reported data [11][12][13]. We chose to vary the experimental conditions (reaction time and different solvents) with the aim to find those leading to an efficient synthesis of monoquaternary salts.…”

New chiral pyrazine-based ligands for self-assembly reactions

“…Compound 1b, C 38 H 36 N 6 , M r = 576.73, colourless rod 0.50 × 0.20 × 0.15 mm 3 . Orthorhombic, P2 1 2 1 2 1 , Z = 4, a = 12.9950 (8), b = 12.0640 (10), c = 19.5348(13) Å, α = β = γ = 90Њ, V = 3062.5(4) Å 3 , ρ calcd = 1251 kg m Ϫ3 , µ = 0.075 mm Ϫ1 . Data were collected on a Stoe Image Plate diffraction system using graphite monochromated Mo-Kα radiation (0.71073 Å).…”