RESUMO
An efficient and selective electrosynthesis of phenols and anilines from arylboronic acids in aqueous ammonia is achieved in an undivided cell. By simply changing the concentration of aqueous ammonia and the anode potential, good yields of phenols and anilines can be obtained chemoselectively with high reaction rates. We propose that anodic oxidation could have played an important role in these transformations.
Assuntos
Compostos de Anilina/síntese química , Ácidos Borônicos/química , Cobre/química , Técnicas Eletroquímicas , Fenóis/síntese química , Aminação , Compostos de Anilina/química , Hidroxilação , Estrutura Molecular , Fenóis/químicaRESUMO
In the presence of p-toluenesulfonic acid and iodine, styrene derivatives undergo head-to-tail dimerization followed by trapping with nitriles to yield the corresponding Ritter-type products.
Assuntos
Acetamidas/síntese química , Ácidos/química , Alcenos/química , Iodo/química , Compostos de Vinila/química , Acetamidas/química , Catálise , Dimerização , Modelos Moleculares , Estrutura Molecular , EstereoisomerismoRESUMO
An efficient synthesis of alkenes from epoxides in a mixture of saturated aqueous NH(4)Br and tetrahydrofuran (8:1) has been developed in an undivided cell fitted with a pair of zinc electrodes, and it is proposed that the reaction is mediated by Zn(0) with a hierarchically organized nanostructure.
RESUMO
The interaction of deoxyribonucleic acid (DNA) and hematoporphyrin-gallium (HP-Ga) complex and the damage of DNA under ultrasonic irradiation in the presence of HP-Ga complex were studied by means of UV-vis spectrum, fluorescence spectrum and gelatin electrophoresis. In addition, some influence factors such as ultrasonic irradiation time, HP-Ga complex concentration, ionic strength and solution acidity on the damage of DNA were also considered. Under a certain condition, the damage degree of DNA was enhanced with increasing ultrasonic irradiation time, HP-Ga complex concentration and ionic strength. Whether the pH value was too high or too low, it would be disadvantage to the damage of DNA. Perhaps, these results would be significant for driving sonodynamic treatment (SDT) to the clinic application in the future.