Melamine trisulfonic acid (MTSA): an efficient and recyclable heterogeneous catalyst in green organic synthesis

Abstract

RSC Adv. 5 (2015) 110, 90819-90837, http://dx

Aqueous extract of Sea buckthorn berries: A greener and ecofriendly medium for synthesis of pyrazolopyranopyrimidines

“…In accordance with the demand for more sustainable chemistry, the search for more environmentally benign forms of catalysis has received irresistible attention, and one of the leading contestants for environmentally acceptable alternatives is the category of biodegradable and renewable materials [10]. Already, several biodegradable materials, such as chitosan [11], starch [12], glycerol [13], Gluconic acid [14], sulfuric acid-modified PEG (PEG-OSO3H) [15][16], melamine trisulfonic acid (MTSA) [17]. In addition, a number of organic reactions using natural catalysts such as clay [18]- [20], natural phosphate [21], animal bone [22], [23] and also various fruits juices [24] are reported in the literature.…”

Synthesis and Application of Fe3O4@RHA@MEL‐SO3H Nanocatalyst in the Synthesis of 1‐amidoalkyl‐2‐naphthols through a Statistical Approach to Optimize the Reaction Conditions

“…By using solid acid catalysts, reaction speed increases and time decreases because the active sites of the catalyst are wide to activate the reactants. [12] Among the major organic compounds, which are important precursors for synthesis, are 1-amidoalkyl-2-naphthols, which, due to their ability to be converted into biologically active compounds can be used in many pharmaceutical compounds including antibiotics, antitumor, antimalarial, and painkillers. [13] Various catalysts such as BBHA/ZnCl 2 , [14] Chitosan-SO 3 H (CTSA), [15] Sulfonated polynaphthalene (S-PNP), [16] tannic acid, [17] nano-BF 3 ⋅ SiO 2 , [18] tetrakis(N-methyl imidazolium-1-ylmethyl)methane tetra hydrogen sulfates ([Tmim] [HSO 4 ] 4 ), [19] and [1,4-DHPyrazine](OTf) 2 .…”

“…These properties are due to their special characteristics, such as high reactivity, easy access to raw substances, and the ability to create a diverse range of reactions. By using solid acid catalysts, reaction speed increases and time decreases because the active sites of the catalyst are wide to activate the reactants [12] …”

Design and development of a novel magnetic camphor nanospheres core/shell nanostructure

“…In a typical procedure, 2.4 g of FeCl 3 and 3 g of FeCl 2 Á5H 2 O were dissolved in 100 mL of deionized water. Then, 2 g of camphor and 10 mL of NH 3 .H 2 O were mixed at 30°C in a three-necked flask. Then, mixture of FeCl 3 and FeCl 2 Á5H 2 O was added in drops in ammonia containing camphor for 150 min at 30°C.…”

“…The catalytic reactions may reduce energy requirements and decrease separation steps because of their increased selectivity. Moreover, catalysis is of crucial importance for the chemical industry to make key products like biologically important heterocyclic compounds and various fine chemicals [2,3]. By utilizing catalysts, organic reactions can be more efficient and selective through decreasing of by-products and wastes [4].…”