Thiosemicarbazone complexes of copper(II): structural and biological studies

Mycotoxins, drugs and other extrolites produced by species in Penicillium subgenus Penicillium

Polyphasic taxonomy of the genus Talaromyces

Ergot alkaloids: structure diversity, biosynthetic gene clusters and functional proof of biosynthetic genes

Biopharmaceutical applications of calixarenes

Stabilities of 3-morpholinosydnonimine (II), hydrochloride (I) and N-ethoxycarbonyl-3-morpholinosydnonimine (VIII) were examined by photometry, potentiometry, thin-layer chromatography and spectroscopy In alkaline solution VIII goes to ethanol, carbon dioxide and II, which successively decomposes to N-morpholino-N-nitrosoaminoacetic acid (V) and N-cyanomethylenaminomorpholine (VI) via N-morpholino-N-nitrosoaminoacetonitrile (III) In the processes of I=II=III, the initial equilibrium is very rapid and the consecutive cleavage is a spontaneous first order reaction at pH 3-7 or a base catalyzed reaction at pH 8-10 The initial process of is a base catalyzed first order hydrolysis of N-ethoxycarbonyl group Hydrolyses of I and VII in hydrochloric acid form morpholine, nitrogen, chloroacetic acid and ammonium chloride Photolyses of I and VII in acid solution at γ<320mμt give glycolic acid beside the products mentioned above Formation of I from III and hydrolysis of VI to N-aminomorpholine are acid catalyzed pseudo-first-order reactions Decomposition of III to VI seems to be a radical reaction

Chemical and Kinetic Study on Stabilities of 3-Morpholinosydnonimine and Its N-Ethoxycarbonyl Derivative

Electrochemical reduction of cephalosporanic acids. A new synthesis of 7-(D-2-amino-2-phenylacetamido)-3-desacetoxycephalosporanic acid

A novel photo-induced methylation of pyrimidines and condensed pyrimidines

r: Rugulovasine A and B are new intercon _??_rtible indole alkaloids isolated from the cultures of Penicillium concavo-rugulosum.1) heir partial structures have been predicted _??_ om infrared spectra and other properties to _??_ ntain a 4-substituted indole and an un _??_ turated lactone.1) In the present paper the hole structure (I) is proposed from NMR _??_ ectra.2) Both A and B have same composition,

Structure of Rugulovasine A, B and their Derivatives

Thioacetazone gives 2 steps of 2-electron reduction waves in acid media, which are ascribed to a reductive cleavage of the N-N bond in the protonated thioacetazone and a saturation of the -CH=N- group, respectively. Precedence of the protonation of base on the electrode causes in a kinetic current. In alkaline media, thioacetazone gives other reduction wave due to a 2-electron reduction of the -CH=N- group in the free base, and an anodic wave which are ascribed to the formation of a mercurous complex on the electrode. The reduction waves of benzaldehyde thiosemicarbazone and p-acetamidobenzaldehyde semicarbazone and the first reduction wave of S-methylthioacetazone are also ascribed to the reaction as similar as that of thioacetazone. The second reduction wave of S-methylthioacetazone as well as the reduction waves of S-methylisothiourea and S-ethylisothiosemicarbazide are assumed to be due to the reduction of the RSC=NH group. p-Acetamidobenzaldehyde shows 2 steps of 1-electron reduction waves at pH about 4, which overlap together and diminish at higher pH. Thiosemicarbazides in alkali give and anodic wave due to a reaction with mercurous ion.

/pdf/polarography-of-thioacetazone-and-its-related-compounds-53vxazysuk.pdf

Polarography of Thioacetazone and its Related Compounds.

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