ChemInform Abstract: SALICYLALDEHYDO CHELATES OF BIS(CYCLOPENTADIENYL)ZIRCONIUM(IV)

Studies onbis(cyclopentadienyl) titanium (IV) chelates of biologically active O-hydroxynaphthoquinone and its derivatives

“…However, this band is absent in the semicarbazone complexes which indicates the replacement of both the chlorines by a single semicarbazone group. The bands appearing at 500-460cm-~ in all the complexes may be assigned to 7(M-O) and 7(M-N) vibrations respectively (Khera et al 1983(Khera et al , 1984Sharma et al 1984).…”

“…A medium intensity band at 1620cm -~ due to ~;(C=N) in the oxime and semicarbazone is shifted to lower frequencies (,~ 1575cm -~) in the complexes, indicating that the C=N bond order decreases and the nitrogen atom coordinates to the metal (Khera et al 1983(Khera et al , 1984Sharma et al 1984). The band around 3400cm -1 in the oxime ligand due to the asymmetric stretching vibration of the terminal -NH z group is not affected on complexation and this indicates that the terminal -NH 2 group does not participate in the coordination by this ligand (Ghosh et al 1981;Sankhla et al 1983).…”

Synthesis and NMR Spectroscopic Studies of Novel N-Acetyl-3-Hydrazonoalkyl Tetramic Acids

“…In the work described here, taking into account the "reactive sites" of the pyrrolidine-2,4-dione ring system, we attempted to explore the condensation reactions of these compounds with l,2-(bis)-nucleophiles, such as hydrazine and substituted hydrazines in order to synthesise hydrazone derivatives which allow to anticipate complexation properties and versatile reactivity (3). One reason for this is their use as precursors for heterocyclic nitrogen derivatives with interesting biological (4), (5), (6) and analytical properties (7). One reason for this is their use as precursors for heterocyclic nitrogen derivatives with interesting biological (4), (5), (6) and analytical properties (7).…”