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2 Bulletin of the Polish Academy of Sciences. Chemistry

2 2001

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The mechanism of L-arginine oxidation by quinquevalent vanadium in the presence of cationic surfactant in sulphuric acid media. A kinetic study

Dubey S., Pandey A.

Bulletin of the Polish Academy of Sciences. Chemistry

2001

Vol. 49, No. 2

183-191

The oxidation is first order each in [substrate] and the [oxidant]. The reaction follows an acid catalysed path, exhibiting second order dependence in [H+]. Bunnett's plot indicates that water acts as a nucleophile. Protonated form of oxidant has been postulated as the reacting oxidizing species. The rate studied at four different temperatures enabled us to calculate activation parameters. A suitable mechanism has been proposed.

Diacetylene omega-glycols. Etherates - adducts of 1,6-di(p-halogeno)-1,6-diphenylhexa-2,4-diyne-1,6-diols with diethyl ether and dioxane

Jasiobędzki W., Moszczyński-Pętkowski R., Woźniak-Kornacka J.

Bulletin of the Polish Academy of Sciences. Chemistry

2001

Vol. 49, No. 3

225-234

Stable, crystalline adducts of the title diols (F, Cl, Br, I) with diethyl ether and dioxane have been obtained. Spectral properties have been described. No formation of etherates from tetraphenyl diols not containing halogen atoms (1) has been found.