Sulfonated PEG-intercalated montmorillonite [(Mt/PEG)-SO3H] as efficient and ecofriendly nanocatalyst for synthesis of α,α′-bis(substituted benzylidene)cycloalkanones

Immobilized Cu(0) nanoparticles on montmorillonite-modified with benzalkonium chloride (MMT-BAC@Cu(0)): as an eco-friendly and proficient heterogeneous nano-catalyst for green synthesis of 5-substituted 1H-tetrazoles

“…In the case of MMT-BAC, the peaks at 1034, 914, and 791 cm −1 can be concertedly attributed to the stretching vibrations of Si-O in Si-O-Al, and bending vibration modes of Al-Al-OH and Mg-Mg-OH groups, respectively. 1 The spectrum of MMT-BAC showed two strong bands at 3620 and 1034 cm −1 that corresponds to the clay and O-H stretching vibration modes of the structural OH groups. The O-H stretching mode of the interlayer water appears at 3405 cm −1 and the H-O-H bending mode of the adsorbed water at 1644 cm −1 .…”

“…A recent focus has come on using clay minerals as heterogeneous and green catalysts. 1 In this regard, montmorillonite (MMT) clay has drawn particular attention due to its high abundance, cation exchange capacity, and other surface areas. The montmorillonite (MMT) clay soil with the general formula (Al 2− x Mg x ) Si 4 O 10 (OH) 2 ·(M· n H 2 O) belongs to the family of phyllosilicates (2 : 1), containing two tetrahedral planes and an octahedral plane.…”

Modification of Montmorillonite with Polyethylene Oxide and Its Use as Support for Pd0 Nanoparticle Catalysts

“…Pd species can be tightly encaged in the narrow galleries between the MMT layers. For same Heck reaction, it is reported [15,17] that Pd@MMT/CS can reuse more times (30 times) than Pd@MMT/PVP catalysts (10 times). It was due to the weaker encaging of Pd species for bigger interlayer space formed in the case of Pd@MMT/PVP and lower chelation ability of PVP than that of CS.…”

“…Recently, many researchers shift the attentions towards heterogeneous catalysis topics with use of MMT-based composites [11,12,13,14]. In particular, MMT/polymer composites have been recognized as good supporting materials for immobilization of transition metal catalysts applied in organic reactions [15,16,17,18,19,20,21]. With synergetic processes of ion-exchange with interlayer cations of MMT and complexation with polar polymers, the transition metal cations, like Pd 2+ will be easily immobilized on MMT/polymer supports.…”

Functionalized Polyethylene Glycol as a Catalyst for Esterification of Salicylic Acid

“…Green chemistry principles now motivate researchers to use solid acids with sulfonate groups functionalized solid acids as high-performance, reusable, and environmentally friendly catalysts for chemical syntheses, as green alternatives to toxic and unrecyclable homogeneous acid catalysts [17,18]. catalysts containing -SO 3 H have received considerable attention as environmentally benign and can be used in organic synthesis particularly in the esterification and transesterification of various alcohols due to their higher acidic strength, increased thermal stability, and reduced toxicity [19][20][21][22]. The citric acid (CA) is an organic acid with a carboxylic group-rich structure that is inexpensive and ecologically benign.…”