Etude en Spectrometrie de Masse: VI—Evaluation de l'Induction de la Fragmentation dans les amines β Fonctionnelles

Mass spectra of 22 β-function amines are compared with those of corresponding non-substited amines. Spectral analysis shows that fragmentation is not induceed by the lone-nitrogen atom: keto, ester, amide or nitrile groups also induce this fragmentation and the ratio was evaluated. This very elementary approach, supported by the kinetics of unimolecular reaction is in good agreement with results based on ionisation potential measurements.     

Aromatisation des dihydro-3,4 carbazole(2h)ones-1 par le chlorure de pyridinium

3,4-Dihydrocarbazol-(2H)-1-ones are transformed by boiling pyridine hydrochloride into corresponding carbazoles.     

Etudes conformationnelles par Résonance Magnetique Nucléaire et variations de températures d'éthanes di- et trisubstitués

In this paper we report the conformational analysis of several di- or trisubstituted ethanes substituted by the following groups: N-dialkly, thioalkyl, alkoxy, N-pyrrolidino, N-benzyl, nitrile or carbomethoxy. Spectra were calculated by a method based on chemical shifts. Relative stabilities of rotamers were discussed in relation to structural parameters (geometrical and electronic).     

Recherches sur la formation et la transformation des esters LXXVIII. Sur la réaction de l'isothiocyanate d'o-méthoxycarbonyl-phényle avec des diamines et l'hydrazine,et sur la cyclisation de quelques N-phényl-N′-hydroxyalcoyl-thio-urées

1-Amino-2-dimethylamino-ethane and 1-amino-3-dimethylamino-propane react with o-methoxycarbonylphenyl isothiocyanate (I) to yield the corresponding 3-(ω-dimethylaminoalkyl)-2-thiono-1,2,3,4-tetrahydroquinazolin-4-ones (V). The tertiary amino group of V is quaternized to the corresponding ammonio derivative VI when treated with methyl iodide in methanol.     

Recherches sur la formation et la transformation des esters LXXV[1]. Amines,amino-alcools et aminoalcoyl-monoesters des acides orthophosphorique et sulfurique: thiocarbamylation par l'isothiocyanate d'o-méthoxycarbonylphényle sans ou avec cyclisation intramoléculaire

o-Methoxycarbonyl-phenylisothiocyanate V and primary alkylamines (R″? NH₂) reacted in the appropriate medium yield the corresponding 2-mercapto-3-alkyl-3, 4-dihydro-quinazolinone-4 derivatives VI (the ? NH₂ group is thiocarbamoylated by the ? N?C?S group and then acylated in an intramolecular reaction by the ? COOCH₃ group with elimination of CH₃OH).     

Note sur la préparation du monoester (triméthylammonio-4-butyl)-sulfurique

4-Trimethylammoniobutyl hydrogensulfate, heated at 185°C under reduced pressure, yields 4-trimethylammoniobutylsulfuric monoester. The rate of scission of this ester in alkaline medium grows with the concentration of the OH^? ions.     

An analysis for heat equations arises in diffusion process using new Yang-Abdel-Aty-Cattani fractional operator

The heat equation is parabolic partial differential equation and occurs in the characterization of diffusion progress. In the present work, a new fractional operator based on the Rabotnov fractional-exponential kernel is considered. Next, we conferred some fascinating and original properties of nominated new fractional derivative with some integral transform operators where all results are significant. The fundamental target of the proposed work is to solve the multidimensional heat equations of arbitrary order by using analytical approach homotopy perturbation transform method and residual power series method, where new fractional operator has been taken in new Yang-Abdel-Aty-Cattani (YAC) sense. The obtained results indicate that solution converges to the original solution in language of generalized Mittag-Leffler function. Three numerical examples are discussed to draw an effective attention to reveal the proficiency and adaptability of the recommended methods on new YAC operator.     

Conservatory of Kaup-Kupershmidt Equation to the Concept of Fractional Derivative with and without Singular Kernel

Making use of the traditional Caputo derivative and the newly introduced Caputo-Fabrizio derivative with fractional order and no singular kernel, we extent the nonlinear Kaup-Kupershmidt to the span of fractional calculus. In the analysis, different methods of fixed-point theorem together with the concept of piccard L-stability are used, allowing us to present the existence and uniqueness of the exact solution to models with both versions of derivatives. Finally, we present techniques to perform some numerical simulations for both non-linear models and graphical simulations are provided for values of the order α = 1.00; 0.90. Solutions are shown to behave similarly to the standard well-known traveling wave solution of Kaup-Kupershmidt equation.