Dicalcium phosphate dehydrate DCPD as a highly efficient and reusable catalyst for Knoevenagel condensation

Improvement of the catalytic performance of hybrid nanocomposite based on phosphate-benzimidazole in Knoevenagel condensation

“…The products ( 3a-j ) obtained is recrystallized from ethanol. The products prepared 3 are known compounds [ 32 , 38 , 39 , 40 ] and were confirmed by comparing the 1 H and 13 C NMR data with authentic samples reported in the literature.…”

“…The protocol of the Knoevenagel condensation reaction of aldehyde with malononitrile was reported using different catalysts such as diamine-functionalized meso polymers [ 17 ], amine functionalized, mesoporous zirconia [ 18 ], Mg–Al mixed oxide on hexagonal mesoporous silica [ 19 ], biguanide-functionalized meso-porous silica [ 20 ], acid–base bifunctional mesoporous MCM-41 silica [ 21 ], amine-functionalized super paramagnetic nanoparticles [ 22 ], chitosan hydrogel [ 23 ], acrylic resin immobilized lipase [ 24 ], organic–inorganic hybrid silica materials containing imidazoliumand dihydroimidazolium salts [ 25 ], IRMOF-3 [ 26 ], ZIF-8 [ 27 ]. Al-KIT-6-NH 2 [ 28 ], Graphene oxide (GO) [ 29 ], Zeolitic imidazolate [ 30 ], graphene oxide with ethylenediamine [ 31 ], DCPD [ 32 ] and chitosan [ 33 , 34 , 35 ]. In this paper, the hybrid nanocomposite xMCl 2 -yNaPO 3 were prepared with different molar ratios and studied as potential heterogeneous catalysts for the Knoevenagel condensation via the reaction of different aldehydes with active methylene in ethanol at room temperature.…”

A Green and Simple Protocol one-pot Biginelli Condensation using Dicalcium Phosphate as Reusable Catalyst

“…After 2 h of maturation, the suspension was filtered, washed and freeze dried. The appropriate physical methods which should be used to confirm the identity of the product are IR absorption spectroscopy, XRD, elemental analyses of calcium and phosphate concentrations, scanning electron microscopy, and specific surface by BET [40].…”

“…In the present study, we report a green and valid procedure for the synthesis of 3,4-dihydro pyrimidin-2-ones via one-pot condensation of aromatic aldehydes, acetylacetone or ethyl acetoacetate and urea or thiourea in the presence of dicalcium phosphate dihydrate (DCPD) [40] as a heterogeneous catalyst.…”

Complex phase evolution of Brushite-based calcium phosphate CaHPO4·2H2O using in situ high temperature X-ray diffraction and thermal analysis

“…Several two and three-dimensional structures have been isolated and different synthesis strategies have been proposed. Among them, Dibasic Calcium Phosphate Anhydrous (DCPA) (CaHPO 4 , Monetite) and Dibasic Calcium Phosphate Dihydrate (DCPD) (CaHPO 4 •2H 2 O, Brushite) with molar ratio Ca/P=1 have gained much attention owing to their wide applications such as potential precursors for the synthesis of biomaterials useful for the orthopedic engineering and dental implants [4,5], selective adsorbents of pesticides, organic pollutants and containment matrices of radioactive elements in environmental science [6,7] and supports of active phases in numerous heterogeneous catalytic reactions, among others vapour-gas conversion of alcohols [8], oxidative dehydrogenation of alkanes [9] and hydroxylation of aromatic compounds [10].…”