ChemInform Abstract: Substituent Effects in 13C NMR Spectra of Diastereomeric Chalcone Dihalides. Part 10. First Synthesis and Determination of Configuration of threo-Chalcone Bromohydrins.
13C NMR spectra of 18 ferrocene analogues of trans stilbenes (1-aryl-2-ferrocenylethylenes) were measured. It was found that bridge group weakens the transfer of the substituent electron effects into ferrocene nucleus, especially distinctly into 3',4'positions of cyclopentadienyl ring. The transfer of substituent effects into β-position of the bridge -CH=CH- is greater in derivatives studied by us than in stilbenes. Synthesis of 1-(4-dimethylaminophenyl)-2-ferrocenylethylene is described.
Studies on nucleosides and nucleotides. LXXXVIII. Purine cyclonucleosides. XLIII. 13C NMR spectra of 2'-substituted 2'-deoxyadenosines. Substituent effects on the chemical shifts in the furanose ring system.