Continuous-flow hydrogenation of aromatic nitro compounds was successfully performed by using polysilane-supported palladium catalysts to afford the corresponding amino compounds in high yields. Productivity was high, and a wide variety of nitro compounds were applicable under the continuous-flow conditions. It is noted that no leaching of palladium was observed by inductively coupled plasma analysis.
Authors:Zhiwei Wu, Fan Yang, Huabang Wang, Jianchao Ma, Ligong Chen, and Yang Li
capacity of Cu 20 / γ -Al 2 O 3 . These facilitated the desorption of aminocompounds on the surface of the catalysts and inhibited the carbon deposition. This could be the better selectivity of homopiperazine and main reason for the longer lifetime of the
Authors:Shailja Arora, Pratibha Kapoor, and Madan Singla
In this study, a high catalytic activity of palladium nanoparticles immobilized on alumina (Al2O3) is reported for the industrially important reduction of aromatic nitro compounds to amino compounds. The palladium nanoparticles
were immobilized on alumina by a simple physical precipitation method. The synthesis of palladium nanoparticles was done in
ethylene glycol without using any external stabilizing agent. The composite particles exhibited good colloidal stability.
The catalytic activity is investigated qualitatively by high performance liquid chromatography (HPLC) and quantitatively by
photometrically monitoring the reduction of p-nitrophenol by an excess of sodium borohydride (NaBH4) in the presence of nanocomposites. The kinetic data could be explained by the assumption of pseudo first-order reaction
with respect to p-nitrophenol.
Authors:Edson da Silva Filho, Sirlane Santana, Júlio Melo, Fernando Oliveira, and Claudio Airoldi
Cellulose was chemically modified with SOCl2 to obtain chlorodeoxycellulose, followed by a reaction that gave bonded ethylene-1,2-diamine (en), producing 6-(2′-aminoethylamino)-6-deoxycellulose.
The reactions were carried out without the presence of solvent, in water or in N,N′-dimethylformamide, in which the highest amount of amino compound was incorporated onto the biopolymer backbone. The X-ray
diffraction patterns for the chlorodeoxycellulose indicate new crystallinities that result from hydrogen bonds established
through bonded chorine atoms and the remaining hydroxyl groups, while all the aminodeoxycelluloses were amorphous compounds.
Thermal stabilities, for all aminated celluloses gave lower final mass losses than for the chlorinated biopolymer, whose value
is lower than unmodified cellulose.
Authors:Juliana Cordeiro Cardoso, Ricardo Luiz C. Albuquerque Jr., Francine Ferreira Padilha, Felipe Oliveira Bittencourt, Osvaldo de Freitas, Paula Santos Nunes, Newton L. Pereira, Maria José Vieira Fonseca, and Adriano Antunes S. Araújo
protein structure seems to be promising [ 12 ]. The reaction is known as Maillard reaction, and it occurs between amino groups and reducing carbohydrates. The final Maillard reaction consists on condensation of aminocompounds and sugar fragments into
Authors:Hieronim Maciejewski, Izabela Dąbek, Ryszard Fiedorow, Michał Dutkiewicz, and Mariusz Majchrzak
homogeneous coatings of high thermal stability were obtained in all cases studied. Moreover, DSC measurements have shown that crosslinking reactions carried out with the use of the above aminocompound are characterised by the highest energetic effect from