Ionic Modified TBD Supported on Magnetic Nanoparticles: A Highly Efficient and Recoverable Catalyst for Organic Transformations

Abstract

1,5,7-Triazabicyclo­[4.4.0]­dec-5-ene (TBD) with ionic modification supported on magnetic nanoparticles was prepared and characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TG), vibrating sample magnetometer (VSM) and elemental analysis. The supported ionic specie was certified as a highly active and magnetically recoverable catalyst for the synthesis of various substituted ureas and structurally diverse N-heterocyclic compounds. The catalyst can be readily recovered by external magnetie and be reused for 6 times without significant loss in catalytic activity. Ionic tagged catalyst performs much better than its ionic-free counterpart in organic transformations.

Intramolecular O‐arylation using nano‐magnetite supportedN‐heterocyclic carbene‐copper complex with wingtip ferrocene

“…The TEM micrographs appeared to have spheres with non‐smooth surface. Moreover, encapsulated dark magnetite nanocores surrounded by grey shell were seen in TEM micrographs (Figure a‐b) . A bright dotted pattern assured the single crystalline nature of magnetite nanocores in the selected area electron diffraction (SAED) pattern (Figure (c)).…”

Green synthesis of new acyl hydrazide derivatives by single and double aza-Michael reaction under solvent-free conditions

“…With this established optimum conditions (acyl hydrazide (1.0 mmol), DABCO (1.0 mmol), TBAB (1.0 mmol) and fumaric esters (1.2 mmol)), we were keen to explore the scope of the reaction with respect to other fumaric esters and acyl hydrazides, whose results are depicted in Table 3 (entries [8][9][10][11][12].…”

“…This reaction has been considerably used in the formation of C-N, C-O, C-S and C-C bonds in modern organic synthesis (11)(12)(13). It is important to note that today, many scientists are interested in using diverse primary amines in the aza-Michael addition reaction to produce selectively mono-or bis-adduct by employing different catalysts and conditions (14)(15)(16).…”

Synthesis and characterization of sulfamic acid supported on Fe3O4 nanoparticles: A green, versatile and magnetically separable acidic catalyst for oxidation reactions and Knoevenagel condensation

“…[9,10] In this category (nanomaterial supports), in recent times, magnetic nanoparticles have received an increasing interest due to their tremendous properties such as simple preparation and functionalization, large surface area ratio, low toxicity and cost. [11][12][13][14][15][16] The simple separation of MNPs-supported catalysts from product or mixture reaction by an external magnet is the most notable advantage of magnetic nanoparticles. [17][18][19] According to these fascinating advantages, magnetic nanoparticles can be considered as a promising alternative to other catalyst supports (such as porous/mesoporous catalyst supports).…”