Mild catalytic oxidations of unsaturated fatty acid methyl esters (FAMEs) by oxovanadium complexes
作者:Martina Maya Cecchini、Francesco De Angelis、Claudio Iacobucci、Samantha Reale、Marcello Crucianelli
DOI:10.1016/j.apcata.2016.01.045
日期:2016.5
A selection of unsaturatedfattyacidmethylesters, namely methyl oleate (C18:1), methyl linoleate (C18:2) and methyl linolenate (C18:3) has been oxidized under mild homogeneous catalytic conditions, using a series of oxovanadium(IV) complexes containing 4-acyl-5-pyrazolone donor ligands with different substituents on acyl residue. The main goal was to evaluate the catalytic role exerted by oxovanadium(IV)
Acylpyrazolones possessing a heterocyclic moiety in the acyl fragment: intramolecular<i>vs.</i>intermolecular zwitterionic structures
作者:Stanislava E. Todorova、Rusi I. Rusew、Zhanina S. Petkova、Boris L. Shivachev、Rositsa P. Nikolova、Vanya B. Kurteva
DOI:10.1039/d1nj05458a
日期:——
and characterized in solution and the solid state. It is found that the products exist in the solid state as intramolecular or intermolecular zwitterions between the tautomeric pyrazolone hydroxyl group and the nitrogen atom of the acyl substituents. Aliphatic amine units with a variable number and type of heteroatoms and ring size are attached and the type of zwitterionsformed are analysed by single
A study of the fluorescence of some newly synthesized europium complexes with pyrazolone derivatives
作者:Dong-Jin Qian、Wei-Nan Leng、Yuan Zhang、Zhong Chen、J Van Houten
DOI:10.1016/s1386-1425(00)00306-1
日期:2000.12
Some europium complexes with pyrazolonederivatives and 1,10-phenanthroline were synthesized and characterized. The europium ion was found to coordinate to O atoms of the pyrazolonederivatives and to N atoms of 1,10-phenanthroline. A strongly ligand-localized UV absorption leads to the europium-centered emissions between 580 and 750 nm which were assigned as the 5D0-->7F0,1,2,3,4 and 5D1-->7F3,4 transitions