One-pot synthesis of N-substituted (3-oxobutanyl)carbamates from primary amines using modified zeolite Hβ at room temperature

Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO2to chemicals and fuels

“…[242][243][244] As such, more than 10 000 tons of carbamates per year are used in the agriculture. 245 The production of carbamates currently proceeds through the alcoholysis of isocyanates or aminolysis of chloroformates, [246][247][248] because the preparation of isocyanates and chloroformates are originated from highly toxic and corrosive phosgene. 249,250 Thus the use of anthropogenic CO 2 as the C1 source for the preparation of carbamates is very topical and numerous works have been reported.…”

Solvent Free Selective Isomerization Of p-diethylbenzene To m-diethylbenzene Using Modified Hβ Zeolites

“…The metals are typical Lewis acids. They were selected on the basis of our earlier results with these metals [24,25]. Al and Ti are strong Lewis acids.…”

Poly(N-vinylimidazole) as an efficient and recyclable catalyst of the aza-Michael reaction in water

“…The aza-Michael reaction is one of the most general and widely used methods for building up new carbon-nitrogen bonds, especially in the synthesis of β-aminocarbonyl compounds. This reaction may be catalyzed by various Lewis acids [11], combinations BF 3 · OEt 2 -R 4 NX [12], MCl 3 -Me 3 SiCl (M = Ru, Fe) [13], Brønsted acids [14], acidic clays [15], amines [16,17], N-methylimidazole [18], coordination compounds of metals of the platinum group [19], ionic liquids [20,21], quaternary ammonium salts [20,22] and bases [23], KF-Al 2 O 3 [24], borax [25], Amberlyst-15 [26], tributylphosphine [27], R 3 P-Me 3 SiCl [28], Cu(acac) 2 -[bmIm]BF 4 [29], copper nanoparticles [30], DOI: 10.1134/S1070428010040019 462 Hβ-SnA zeolite [31], silica gel [32], β-cyclodextrin [33], sugars [34], sodium dodecyl sulfate [35], and in the recent time by organic catalysts, e.g., of peptide type [36]. Data were also reported on the aza-Michael reactions performed in water in the absence of a catalyst [37,38].…”