Silica‐Supported Perchloric Acid (HClO₄—SiO₂): An Efficient Reagent for the Preparation of Primary Carbamates under Solvent‐Free Conditions.

Abstract

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Synthesis of arylaminotetrazoles by ZnCl2/AlCl3/silica as an efficient heterogeneous catalyst

“…In other words, the distribution of isomeric tetrazoles 3 and 4 is probably a direct measurement of the distribution of the tautomeric guanyl azides A and B at equilibrium. 2-Methylphenylcyanamide (Table 1, entry 9) interestingly gave 1-(2-methylphenyl)-5-amino-1H-tetrazole (4i), while with HOAc and FeCl 3 -SiO 2 , 5-(2-methylphenylamino)-1H-tetrazole (3i) and a mixture of isomers were obtained, respectively (Scheme 6) [23].…”

“…In the course of our researches on the synthesis of different heterocycles [18,19] and applications of heterogeneous reagents [20], we report herein the synthesis of arylaminotetrazoles (3a-3e and 4f-4m) from a wide variety of arylcyanamides 1a-1m and sodium azide (2) in the presence of the ZnCl 2 /AlCl 3 /silica (ZAS) catalyst at 120°C in DMF after appropriate times (Scheme 1; Table 1). …”

Green synthesis of palladium nanoparticles using Hippophae rhamnoides Linn leaf extract and their catalytic activity for the Suzuki–Miyaura coupling in water

“…Due to our ongoing interest on the green chemistry and natural compounds [14][15][16][17][18][19][20][21][22][23][24], we wish to report a new and rapid protocol for preparation of Pd NPs by using Hippophae rhamnoides Linn leaf extract (Fig. 1) as a reducing and stabilizing agent.…”

Synthesis and characterization of reusable nano-order SO3H-KIT-5 as a heterogeneous catalyst for eco-friendly synthesis of 1,4-dihydropyridines

“…Recently, solid acid catalysts-clay (Bahulayan et al 2002) or silica (Bigdeli et al 2007;Modarresi-Alam et al 2008)-play an important role in organic reactions as an efficient and heterogeneous catalyst. The catalysts based on silica have some advantages, and they are very inexpensive and easy to prepare especially.…”