The present paper presents the optimum conditions for the synthesis of 8 mono- and dinitrobenzophenones starting from accessible reagents. The 3,3’- and 3,4’- isomers were obtained from benzophenone and 4-nitrobenzophenone respectively by continuous generation of nitronium ions, using anhydrous sodium nitrate and a 1:1 (w/w) mixture of concentrated sulfuric acid and oleum (20% SO3). This method is remarcably selective, leads to good yields and

1-Aroyl-thiosemicarbazides obtained by the reaction of thiosemicarbazide with substituted benzoyl chlorides had been cyclized in alkaline solution to the title compounds 3-aryl-5-mercapto-1,2,4-triazoles, which were characterized by IR, 1H-NMR and electron impact mass spectroscopy.

The glycosylation by Ferrier method of 3-mercapto-5-o-chloro-phenyl-1,2,4-triazole with 1-O-acetyl-2,3,4,6-tetra-O-acetyl-β-D-glucopryanose leads exclusively to S-glycoside. The formation of 1N-, 4N- or 1N,S-diglycosides was not observed. The assignment of the newly synthetized compound structure was based on 1H-, 13C-NMR, IR, UV and mass spectrometry.

Comparative analysis of the electronic impact mass spectra (EI-MS) of the 3- and 4-nitrobenzophenone acetals leads to the observation that the fragmentation of these compounds is similar.The paper presents a method for the correlation of the experimentally obtained differential mass spectrum Pms with the heat of formation calculated by the semiempirical methods AM1 and PM3 for the ions generated in the mass spectrometer.These methodology allows for

Comparative analysis of the electronic imapct mass spectra (EI-MS)of the exo-and endo-5,10-methylene-10,11-dihydro-5H-dibenzo[a,d,]cyclohepten-11-ols revealed a similar fragmentation of these compounds. The paper presents a method for the correlation of the experimentally obtained differential mass spectrum Pms with the heats of formation calculated by the semiempirical methods AM1, PM3,MINDO3 and MNDO for the ions resulted in the mass spectrometer.

The synthesis of three disazo dyes with asymmetrical structure derived from 4,4'-diaminobenzanilide is presented. Salicylic acid, 6-amino-4-naphtol-2-sulphonic acid, 6-benzoylamino-4-naphtol-2-sulphonic acid and 7-amino-4-naphtol-2-sulponic acid were used as coupling components. These dyes are analogue of the benzidinic C.I.direct Brown 2 (C.I.22311),C.I.direct Brown 59 (C.I.22345) and C.I.direct Red 33 (C.I.22306).The dyes were analyzed by thin

The synthesis of two new disazo dyes with symmetrical structure containing 4,4'-diaminobenzanilide as middle component is presented.2-hydroxy-7-naphtalenesulphonic acid and 2-hydroxy-3,6-naphtalenedisulphonic acid were used as coupling components. The dyes were analyzed by TLC,UV-VIS, and their structure was confirmed bay mass spectrometry (FABS). The toxicity of the synthesized dyes and of their precursors was evaluated by biological tests, using

Due to the possibility to act as natural amino acid mimetics, alfa-aminophosphonic acids and their derivatives, present a special interest, especially when their structure contains a chiral atom of carbon.There is presented a study of a series of 12 aminophosphonates antioxidant activity, reported to the reference reaction between a free radicals generator-DPPH and a well known antioxidant in the food industry,BHT. The final results shows that the

This work presents the experimental results of the investigations concerning the oxidation reactions between 1,2-propanediol (PG) and metal nitrates, in weak acid solutions. These reactions occurs, under some working conditions, with the oxidation of 1,2-propanediol to lactic acid, coordinated as lactate anion to the metal(II) cation (M(II) = Co(II), Ni(II), Cu(II)), with simultaneous isolation of some homopolynuclear coordination compounds. In order

The synthesis of glycosyl sulphone in PTC conditions using dioxirane generated in situ are presented. The yields of the oxidations in PTC conditions (60-81%) are comparable with those of reactions using NaIO4 and RuCl3 as catalyst. The synthesised glycosyl sulphone have been characterized by Chemical Ionization – Mass Spectrometry (CI-MS), 1H-NMR spectroscopy and melting point.