Selective vapor phase synthesis of 1,2,3,4,5,6,7,8-octahydro acridin 9-ylamine over Al–MCM-41 molecular sieves☆

Mesoporous aluminosilicate-catalyzed allylation of aldehydes with allylsilanes

“…Therefore, Al-MCM-41 has been shown to catalyze several organic transformations. [13][14][15][16][17][18][19] However, most of these reactions are vapor phase or high-temperature reactions, [13][14][15][16][17] and there has been relatively few reports on the synthetic application of Al-MCM-41 as a solid acid catalyst for liquid-phase reactions under mild reaction conditions. 18,19 Herein, we report the facile catalytic system for the reaction of aldehydes with allylsilanes by using Al-MCM-41.…”

Highly Selective Synthesis of Octahydroaminoacridine over Mesoporous ZnAlMCM-41 Catalysts

“…As showed in literature, 15,16 the mesoporous aluminosilicate catalysts, AlMCM-41 (15) and AlMCM-41(30), were prepared using corresponding n Si /n Al ratios of ∼15 and 30 in the product, with a basic hydrothermal method, and were used as the catalysts in the vapor phase cyclization of CHCO with a mixture of HCONH 2 and NH 3 . Mesoporous AlMCM-41 (15) produces OA, DCA, and OHA with selectivities of ∼44, ∼30, and ∼17%, respectively.…”

“…Mesoporous AlMCM-41 (15) produces OA, DCA, and OHA with selectivities of ∼44, ∼30, and ∼17%, respectively. 15,16 CoAlMCM-41 has higher OA selectivity (67%) than mesoporous aluminosilicates such as AlMCM-41 (15) and AlMCM-41(30) because of its higher acid strength, which can be more favored for cyclization and aromatization than AlMCM-41 (15). From these literature results, 15,16 catalyst system produces the direct condensation product, DCA, with 21% selectivity.…”

“…The zeolites and mesoporous catalysts were used as heterogeneous catalysts for the synthesis of OA and OHA as reported elsewhere. 15,16 To the best of our knowledge, the synthesis of OA by using ZnAlMCM-41 catalysts, which were synthesized by the Selvaraj research group, 17,18 has not been clearly reported until now. This study introduces a facile method for the selective synthesis of OA using cheap raw chemicals, such as CHCO, HCONH 2 and NH 3 , under a single-step vapor phase method.…”

Fabrication of lithium silicates from zeolite for CO2 capture at high temperatures

“…For Al-MCM-41 and Ca-MCM-41, only the (100) reflexes were observed at 2 θ = 2.3 °, which proved that the long-order structure of MCM-41 were further reduced. But the obvious (100) diffraction peak confirmed that the meso-structure of the host materials was still maintained [50][51][52] . It was also observed that the (100) reflection peak of all metal modified MCM-41 samples slightly shifted to lower angle, which indicated that the d (100) spacing, lattice parameter, and the wall thickness of the hexagonal meso-pores increased concurrently after being modified by metals [53][54][55] .…”