1,720,995 research outputs found
Giovanni Zalin storico dell'economia
No full textRicostruzione della carriera e del profilo intellettuale di uno storico economico italiano
Economia e popolazione in Friuli dalla caduta della repubblica di Venezia alla fine della dominazione austriaca
No full textNEW HETEROCYCLIC STRUCTURES - [1,2,5]THIADIAZOLO[3',4'-4,5]PYRIMIDO[2,1-B][1,3]THIAZINE AND THIAZOLO[3,2-A][1,2,5]THIADIAZOLO[3,4-D]PYRIMIDINE
No full textDerivatives of two new molecular structures, namely, 7,8-dihydro-6H,10H-[1,2,5]thiadiazolo[3',4':4,5]pyrim-ido[2,1-b][1,3]thiazin-10-one and 6,7-dihydro-9H-thiazolo[3,2-a][1,2,5]thiadiazolo[3,4-d]pyrimidin-9-one, and derivatives of N-substituted sulfamic acid, namely, (8-amino-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3]thiazin-6-on-7-yl)sulfamic acid and (7-amino-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidin-5-on-6-yl)sulfamic acid, were separated out as by-products in the reduction reaction of 8-amino-3,4-dihydro-7-nitroso-2H,6H-pyrimido[2,1-b][1,3]thiazin-6-one and 7-amino-2,3-dihydro-6-nitroso-5H-thiazolo[3,2-a]pyrimidin-5-one derivatives, respectively, with sodium hydrosulfite. A mechanism of reaction, which hypothesizes the action of sodium hydrosulfite in an asymmetic form, is proposed. The results of single-crystal X-ray investigation on 7,8-dihydro-6H,10H-[1,2,5]thiadiazolo[3',4':4,5]pyrim-ido[2,1-b][1,3]thiazin-10-one (R = 0.032 for 863 reflections) and (8-amino-3,4-dihydro-2H,6H-pyrimido[2,1-b]-[1,3]thiazin-6-on-7-yl)sulfamic acid, sodium salt (R = 0.028 for 3507 reflections) are reported
NEW HETEROCYCLIC STRUCTURES - [1,3]THIAZINO[3,2-A]PURINE AND [1,2,3]TRIAZOLO[4,5-D][1,3]THIAZINO[3,2-A]PYRIMIDINE
No full textThe syntehtic pathway of the [1,3]THIAZINO[3,2-A]PURINE AND [1,2,3]TRIAZOLO[4,5-D][1,3]THIAZINO[3,2-A]PYRIMIDINE has been described and the antiviral activity evaluated
Primary non-Hodgkin's lymphoma of the head of the pancreas. A case report and review of literature.
No full textONCOLOGY REPORTS (ATHENS
Premessa e curatela di "Le radici della Storia economica in Italia. La costruzione di un metodo" (sezione monografica di Storia economica 2/2014)
No full textDETERMINATION OF THE REACTIVITY OF URACIL DERIVATIVES WITH RESPECT TO METHYL-IODIDE BY HIGH-PERFORMANCE THIN-LAYER CHROMATOGRAPHIC DENSITOMETRY
No full textA high-performance thin-layer chromatographic method is described for the investigation of the methylation rates of uracil, 5-fluoro-, 5-chloro-, 5-bromo-, 5-methyl- and 5-nitrouracil and their N1- and N3-methyl derivatives. The method allowed the amounts of compounds obtained, the time required to complete the reaction and therefore the reactivity of the uracil derivatives to be determined. The N1- and N3-methyl and N1,3-dimethyl derivatives were synthesized and separated by droplet countercurrent chromatography and/or medium-pressure liquid chromatography and their R(F) values were determined in different solvent systems by thin-layer chromatography
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