Green synthesis, zeolite

M. K. Patil, M. Keller, B. M. Reddy, P. Pale, J. Sommer, Copper-zeolites as green catalysts for multicomponent reactions an efficient and green synthesis of propargyl amines, Eur. J. Org. Chem., 2008, 26, 4440 445. 

D. HaMbi, M. Nasrollahzadeh, T.A. Kamali, Green synthesis of the 1-subslituted lH-1,2,3,4-tetrazoles by appUcalion of the Nalrolite zeolite as a new and reusable heterogeneous catalyst. Green Chem. 13 (2011) 3499-3504. 

Balalaie, S. and Arabanian, A., One-pot synthesis of tetrasubstituted imidazoles catalyzed by zeolite HY and silica gel under microwave irradiation, Green Chem., 2000,2, 274-276. 

Balalaie, S., Al abaman, A. and Hashtroudi, M.S., Zeolite HY and silica gel as new and efficient heterogenous catalysts for the synthesis oftriarylimidazoles under microwave irradiation, Monatsh. Chem., 2000,131,945— 948 Balalaie, S. and Arabanian, A., One-pot synthesis of tetrasubstituted imidazoles by zeolite HY and silica gel under microwave irradiation, Green Chem., 2000, 2, 274-276. 

Cesium-exchanged zeolite X was used as a solid base catalyst in the Knoevenagel condensation of benzaldehyde or benzyl acetone with ethyl cyanoacetate [121]. The latter reaction is a key step in the synthesis of the fragrance molecule, citronitrile (see Fig. 2.37). However, reactivities were substantially lower than those observed with the more strongly basic hydrotalcite (see earlier). Similarly, Na-Y and Na-Beta catalyzed a variety of Michael additions [122] and K-Y and Cs-X were effective catalysts for the methylation of aniline and phenylaceto-nitrile with dimethyl carbonate or methanol, respectively (Fig. 2.37) [123]. These procedures constitute interesting green alternatives to classical alkylations using methyl halides or dimethyl sulfate in the presence of stoichiometric quantities of conventional bases such as caustic soda. 

Synthesis and Photochromism of 6-Nitrospiropyran A Green Chemistry Preparation for Organic Chemistry Laboratory. Abstr. Pap.—Am. Chem. Soc. 2006, 231, CHED-283. (e) Wetter, E. Levy, I. J. Multicomponent Zeolite-Catalyzed Synthesis of p-Acetamido Ketones A Green Chemistry Laboratory Experience. Abstr. Pap.—Am. Chem. Soc. 2006, 231, CHED-272. (f) Hamel, L. J. Levy, I. J. Analyzing Green Chemistry A... 

Following the successful application of zeolites in the major oil refining processes, zeolites entered the field of bulk chemicals synthesis, e.g. ethylbenzene, cumene and recently caprolactam. Their applications in the areas of fine chemicals arc also growing. An important factor is that zeolites, compared to conventional Brocnsted and Lewis acid catalysts, are low-waste catalysts and are regarded as green . After the early review on zeolite-catalyzed organic reactions by Venuto and Landis [ 1J the field has been reviewed several times [2-11],... 

The results for the synthesis of an X type zeolite in the presence of FePc, CoPc, NiPc, and CuPc are shown in table 1. In all cases here the metal complex or metal complex solution was added to the aluminosilicate gel immediately after mixing the silicate and aluminate solutions. The mixture was magnetically stirred for 15 minutes before heating. The resulting crystals were washed with water extracted with pyridine and sublimed. The surface MPc complexes can not be removed by solvent extraction. However, vacuum sublimation appears to be completely effective for removing non-intrazeolite complexes. The product zeolites were various shades of blue but became a very pale blue-green after... 

R, Santamaria J. Fast microwave synthesis of Pt-MFI zeolite coatings on silicon micromonoliths Application to VOC catalytic combustion. Green Process Synth 2012 1(2) 169-174. 

The monomer-loaded zeolite samples display dramatic color changes from white to different hues of blue and green when (a) aniline in different acidic zeolite forms is treated with the oxidant, or when (b) pyrrole or thiophene monomers are admitted into Cu(II)/Fe(III)-containing zeolites Y or MOR from the vapor phase or from hexane (or other hydrocarbon) solutions (Table 1). These color changes correspond to those observed in bulk synthesis reactions.H l No reaction is observed with the zeolite sodium forms, indicating that the polymerizations proceed only in the presence of intfazeolite protons and/or appropriate oxidants. No polymer formation is detected in zeolite Cu(II)A (pore size 0.4 nm, smaller than pyrrole or thiophene). This is... 

J., and Pale, P. 2010. Copper(I)-zeolites as new heterogeneous and green catalysts for organic synthesis. Synthesis. (9) 1557-1567. 

Green, B., Gupta, A. K. D., Das, K. R., Chatterje, R. M. 1969. Coumarins and related compounds. Rart IV. Aluminium chloride-catalysed reaction of phenols with methyl acrylate A new approach to the synthesis of hydroxy coumarins. J. Chem. Soc. C. 1969 29-33. Gunnewegh, E. A., Hoefnagel, A. J., VanBekkum, H. 1995. Zeolite catalysed synthesis of coumarin derivatives. J. Mol. Catal. A Chem. 100 87-92. 

K. Arya, U. C. Rajesh, D. S. Rawat, Green Chem. 2012, 14, 3344—3351. Proline confined FAU zeolite heterogeneous hybrid catalyst for the synthesis of spiroheterocycles via a Mannich type reaction. 

Catalytic Synthesis of Pyrazolo [3,4-thiol Derivatives Using Nanoparticles of NaX Zeolite as Green Catalyst... 

K. Arya, D.S. Rawata, H. Sasaib, Zeolite supported Bronsted-add ionic liquids an eco approach for synthesis of spiro[indole-pyrido[3,2-e] thiazine] in water under ultrasonication. Green Chem. 14 (2012) 1956-1963. 

K. Arya, B. Prabhakar, Ionic liquid confined zeolite system an approach towards water mediated room temperature synthesis of spiro[pyrazolo[3,4-e]benzothiazepines]. Green Chem. 15 (2013) 2885-2894. 

V.V. Krishna, M. Kandepi, N. Narender, Synthesis of N-heterocyclic compormds over zeolite molecular sieve catalysts an approach towards green chemistry, Catal. Sci. Technol. 2 (2012) 471 87. 

V. Radha Rani, N. Srinivas, M. Radhakishan, S.J. Kulkarni, K.V. Raghavan, Zeolite-catalyzed cyclocondensalion reaction for the selective synthesis of 3,4-dihydropyrimidin-2(lJT)-ones, Green Chem. 3 (2001) 305-306. 

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