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Electrochemical Behaviour of Chloride and Bromide Complexes of Palladium(II) with 4-Amino-6-methyl-3-thio-3,4-dihydro-1,2,4-triazin-5(2H)-one in Dimethylformamide at Glassy Carbon Electrode

100%

Fotouhi L. , Ghassemzadeh M. , Heravi M. M.

tom Vol. 77 / nr 7

895-902

The electrochemical behaviour of palladium(II) complexes of PdCl2L(I) and PdBr2L(II) (L = 4-amino-6-methyl-3-thio-3,4-dihydro-1,2,4-triazin-5(2H)-one) has been investigated in dimethylformamide at glassy carbon electrode. Under cyclic voltammetric conditions, complex PdCl2L is found to undergo a one-electron oxidation at 1.27 V with a prewave, which is similar to oxidation of ligand L. The oxidation of ligand shows an oxidation wave at 1.25 V with EC mechanism. In the chemical reaction following the one electron irreversible oxidation of ligand, the electrochemical-generated cation radical forms a dimer, which is reduced at reverse scan at -0.66 V to reproduce the monomer. Thus, the nature of oxidation of both complexes I and II suggests a ligand-centered oxidation, because their oxidation behaviour is similar to oxidation of ligand L. However, the reduction of both complexes I and II shows a reduction peak at -1.31 V and -1.33 V respectively, which is related to reduction of metal center of complexes, Pd (II) to Pd (I).

Facile Synthesis of 2-Substituted Quinazolinones

88%

Heravi M. , Montazeri N. , Rahimzadeh M. , Bakavoli M. , Ghassemzadeh M.

Polish Journal of Chemistry

2004

tom Vol.78 /nr 11-12

2101-2103

Anthranilic acid reacts with aromatic nitriles in the presence of potassium tert-butoxide to form 2-arylsubstituted quinazolinones in good yields.