Synthesen durch Michael‐Addition von Pyridiniumsalzen

Kröhnke, Fritz; Zecher, Wilfried; Drechsler, D.; Pfleghar, K.; Schnalke, Karl‐Erwin; Weis, Willi

doi:10.1002/ange.19620742106

Cited by 62 publications

(11 citation statements)

References 15 publications

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“…2‐(3‐Pyridinioacetylphenyl)pyridine iodide . A mixture of 2‐(3‐acetylphenyl)pyridine (2.39 g, 12 mmol) and iodine (3.10 g, 12 mmol) in dry pyridine (25 mL) was stirred at 70 °C under argon atmosphere for 16 h. The reaction mixture was then cooled in an ice bath.…”

Section: Methodsmentioning

confidence: 99%

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Tanaka

Sato

Ichida

et al. 2015

Chemistry An Asian Journal

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We prepared enantiomers of chiral Pt(II) complexes, Pt(pppb)Cl and Pt(pppb)CN (pppbH=1-pyridyl-3-(4,5-pinenopyridyl)benzene), and measured their CPL (circularly polarized luminescence) spectra for excimer and trimer emission. The contribution of the pinene moiety to CPL was considerably low for the π-π* emission of the monomer but large for MMLCT (metal-metal-to-ligand charge-transfer) of the excimer and trimer which had a helical structure induced in a face-to-face stacking fashion. The trimer CPL for (+)-Pt(pppb)Cl was larger in intensity than that of excimer CPL; on the other hand, that for (+)-Pt(pppb)CN was opposite in sign compared with that of excimer CPL. We conclude that differences in the excited-state structure of the aggregate between Pt(pppb)Cl and Pt(pppb)CN account for the variation in the CPL spectra. By the aid of TD-DFT calculations it was predicted that the dihedral angle θ(Cl-Pt-Pt-Cl) was 50-60° or 110-140° for Pt(pppb)Cl aggregates and 160° for Pt(pppb)CN aggregates.

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Section: Methodsmentioning

confidence: 99%

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Tanaka

Sato

Ichida

et al. 2015

Chemistry An Asian Journal

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“…cis 42 tetradec-2-enedioic acid 14-benzyl ester, 8 5-methyl-2,2'-bipyridine [23][24][25] and (2-amino-ethyl)-carbamic acid tert-butyl ester 17 were prepared by literature methods. …”

Section: Methodsmentioning

confidence: 99%

Functionalisation of bolaamphiphiles with mononuclear bis(2,2′-bipyridyl)ruthenium(ii) complexes for application in self assembled monolayers

et al. 2003

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This submission was created using the RSC Article Template (DO NOT DELETE THIS TEXT) (LINE INCLUDED FOR SPACING ONLY -DO NOT DELETE THIS TEXT)A novel ruthenium(II) polypyridyl complex connected covalently to a bolaamphiphile, containing amide linkages to provide rigidity via hydrogen bonding in the monolayer, has been prepared. The ruthenium(II) complexes of this ligand and of the intermediates in the synthesis were prepared by modification of the coordinated ligands, demonstrating the synthetic versatility and robustness of this family of complexes. All ruthenium complexes were characterised by electrochemical and spectroscopic techniques and were found to have similar properties to the parent complex [Ru(bipy) 3 ] 2+, and remain versatile photosensitisers, with well-defined properties, despite extensive substitution of the bipy ligand.

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“…In the 1960s, 1 this reaction was first described by F. Kröhnke, who largely demonstrated its potential from acyl derivatives through the development of syntheses of various substituted pyridines or oligopyridines. 2…”

Section: Short Review Syn Thesis 2 the Kröhnke Reactionmentioning

confidence: 99%

Recent Uses of Kröhnke Methodology: A Short Survey

Sasaki

2016

Synthesis

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The scope of this short review is to point out how such an old reaction as the Kröhnke-type ring closure is still used nowadays to enable simple access to pyridines or polypyridines. Besides the usual Stille or Suzuki coupling reactions, which deal, respectively, with stannylated derivatives or boronic derivatives, the Kröhnke reaction can reach its target molecules with commercially available starting materials in a simple reaction medium without any special care.

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Synthesen durch Michael‐Addition von Pyridiniumsalzen

Cited by 62 publications

References 15 publications

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Functionalisation of bolaamphiphiles with mononuclear bis(2,2′-bipyridyl)ruthenium(ii) complexes for application in self assembled monolayers

Recent Uses of Kröhnke Methodology: A Short Survey

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