Highly Efficient Hydrogen Evolution System of Melamine/BH₃ without Using Any Catalyst

Abstract

A highly efficient melamine/BH 3 H 2 evolution system, which can spontaneously release 6 equiv of H 2 from 1 equiv of melamine at room temperature and is capable of releasing further 3 equiv of H 2 at higher temperatures, has been developed. The dehydrogenation reaction was verified and studied by 1 H and 11 B NMR, MALDI-TOF MS analyses, as well as H 2 evolution experiments, under different conditions. The reaction products were characterized by elemental analyses, IR, and solid 11 B NMR spectroscopic techniques. Studies on the dehydrogenation reaction of BH 3 with a model compound oaminopyridine provide solid experimental evidence for further confirming the spontaneous NH/BH dehydrocoupling reaction.

The influence of different zeolitic supports on hydrogen production and waste degradation

“…[1][2][3][4][5][6][7] Thus, the conversion of sustainable energy into carbon-free energy has become more interesting. Currently, hydrogen is considered one of the most renewable, ecologically correct, and sustainable energy vectors that can replace fuels from fossil sources, [8,9] and it is possible to manufacture it from bio-alcohols and water. This second choice would be the best choice owing to the significantly less demanding technological (temperature and pressure) requirements, the simplicity of the concept, [10] and the possibility of using energy sources, such as solar energy, for converting the sunlight energy into hydrogen energy.…”

A tandem reduction of primary amines, carbonyl compounds, CO2, and boranes catalyzed by in situ formed frustrated Lewis pairs

“…Anilines bearing electron-donating groups and electron-withdrawing groups reacted efficiently with CO 2 , affording the corresponding methylated products in good yields (4-16). Functionalized anilines bearing methoxy ( 5), thioether (6), halide (8)(9)(10)(11), trifluoromethyl (12), nitro (13), ester ( 14), and hydroxy (15) groups, were perfectly compatible to react with CO 2 , illustrating the excellent chemoselectivity of the transformation. Notably, reducible functional groups, such as nitro (13) and ester ( 14), were unchanged under reductive conditions, whereas acetyl and carboxyl groups that are highly reactive to borane were further reduced to afford 17 and 4, respectively, in good yields.…”

“…The dehydrogenation of 2-aminothiazole with borane forms catalyst IM3 in situ . 12 IM3 acts as an intramolecular FLP to capture CO 2 to generate IM4 . 13,14 Imines are reduced with borane to generate an amino-borane complex, followed by the nucleophilic attack on IM4 to afford intermediate IM8 and regenerate catalyst IM3 .…”