312933-35-0Relevant articles and documents
Nenitzescu Synthesis of 5-Hydroxyindoles with Zinc, Iron and Magnesium Salts in Cyclopentyl Methyl Ether
Azzena, Ugo,Beccu, Andrea,Carboni, Silvia,Carraro, Massimo,De Luca, Lidia,Gaspa, Silvia,Livesi, Marco,Pira, Giovanni Michele,Pisano, Luisa,R?mer, Melina,Satta, Giuseppe,Solinas, Angelo,Usala, Elena
supporting information, p. 5835 - 5842 (2021/11/17)
In this work, mild Lewis acids and low environmental impact solvents were investigated for Nenitzescu synthesis. Cyclopentyl methyl ether can be used at room temperature in substitution of halogenated solvents with zinc, iron and magnesium salts as homogeneous catalysts to give 5-hydroxyindoles in fair to good yields. The reaction features a straightforward workup and excellent solvent recycle.
A simple protocol for the preparation of β-enamino ketones catalyzed by NbOPO4under solvent free conditions
Wodtke, Felipe,Xavier, Fernando R.,Mendes, Samuel R.,de Oliveira, Alfredo R.M.,Gariani, Rogério A.
supporting information, p. 231 - 234 (2016/12/27)
A novel application of the highly stable niobium oxide phosphate (NbOPO4) as an efficient catalyst for the synthesis of β-enamino ketones under solvent-free conditions is described. This protocol, exhibits attractive yields, short reaction periods, lower loading of catalyst and high chemoselectivity.
Enamination of β-dicarbonyl compounds with amines
Khodaei,Khosropour,Cardel
scheme or table, p. 217 - 221 (2009/04/06)
Enamination of a wide variety of primary amines was successfully described with excellent chemoselectivity in the presence of catalytic amounts of β-cyclodextrin in water under mild conditions. Aliphatic amines also reacted efficiently to produce the corresponding enaminones.
Highly efficient microwave-accelerated preparation of β-ketoimines
Lee, Dong Hwan,Park, Sang-Eon,Cho, Kyuho,Kim, Younsoo,Athar, Taimur,Lee, Ik-Mo
, p. 8281 - 8284 (2008/03/30)
We present here a new and efficient methodology for the β-ketoimine ligand with microwave heating system. The new method showed faster reaction rates, higher yields, and selectivities of the desired compounds in the absence of solvents.
A novel enamination of β-dicarbonyl compounds catalyzed by Bi(TFA)3 immobilized on molten TBAB
Khodaei, Mohammad M.,Khosropour, Ahmad R.,Kookhazadeh, Mehdi
, p. 209 - 212 (2007/10/03)
Enamination of a wide variety of primary amines was successfully carried out in the presence of catalytic amounts of bismuth(III) trifluoroacetate immobilized on molten tetrabutylammonium bromide as "green" media under mild conditions. This new system of the catalyst is recyclable and reusable. Generally, the results of the reaction in tetrabutylammonium bromide is better than the previously obtained results in water because of their yields and reaction times.
Cerium(III) chloride heptahydrate (CeCl3·7H2O) as an efficient enamination catalyst in aqueous media
Khodaei,Khosropour,Kookhazadeh
, p. 1445 - 1448 (2007/10/03)
Cerium(III) chloride heptahydrate CeCl3·H2O catalyzes enamination of β-dicarbonyl compounds with primary amines in aqueous medium at room temperature to afford the corresponding β-enamino ketones with high chemoselectivity.
New boronates prepared from 2,4-pentanedione derived ligands of the NO2 and N2O2 type - Comparison to the complexes obtained from the corresponding salicylaldehyde derivatives
Sánchez, Mario,Sánchez, Obdulia,H?pfl, Herbert,Ochoa, Maria-Eugenia,Castillo, Dolores,Farfán, Norberto,Rojas-Lima, Susana
, p. 811 - 822 (2007/10/03)
2,4-Pentanedione (=acetylacetone) has been reacted with 2-aminoethanol, 1,2-diaminoethane and 1,3-diaminopropane to give the NO2 and N2O2 type ligands named acacaminolH 2, acacenH2 and acpenH2, which are structurally and electronically related to the corresponding ligands derived from salicylaldehyde (salaminolH2 and salenH 2). On reaction of acacaminolH2 with phenylboronic acid a dinuclear monomeric complex has been obtained containing one three- and one four-coordinate boron atoms as well as one six-membered and one seven-membered heterocyclic ring. Since with salaminolH2 a dimeric complex with a central 10-membered heterocycle had been reported, it becomes apparent that there may be differences in reactivity when comparing 2,4-pentanedione and salicylaldehyde derived ligands. The molecular compositions of the boron complexes prepared from acacenH2 and acacpenH2 are analogous to the corresponding salen and salpen derivatives, however, the presence of two methyl groups in the six-membered chelate rings generates some structural changes, the most important being the distortion of the boat conformation of the central heterocyclic ring. This was predicted by computational methods and confirmed experimentally for one of the complexes. A further important observation was that the products described in here are much more soluble than the salicylaldehyde derivatives. As lateral product the adduct of acacenH2 with 1,3,5-triphenylboroxine was crystallized. Elemental analysis, IR and NMR (1H, 13C, 11B) spectroscopy, mass spectrometry, ab intio theoretical calculations and X-ray crystallography have been applied to carry out this study.
A mild, efficient and environmentally friendly method for the regio- and chemoselective synthesis of enaminones using Bi(TFA)3 as a reusable catalyst in aqueous media
Khosropour, Ahmad R.,Khodaei, Mohammad M.,Kookhazadeh, Mehdi
, p. 1725 - 1728 (2007/10/03)
Bismuth(III) trifluoroacetate has been found to be an extremely efficient catalyst for the preparation of β-enaminones in water. In addition, by employing this catalyst, high regio- and chemoselective enamination of carbonyl compounds was achieved.
Enamination of β-dicarbonyl compounds catalyzed by CeCl 3·7H2O at ambient conditions: Ionic liquid and solvent-free media
Khodaei, Mohammad Mehdi,Khosropour, Ahmad Reza,Kookhazadeh, Mehdi
, p. 1980 - 1984 (2007/10/03)
Enamination of a wide various primary amines was successfully carried out in the presence of catalytic amounts of cerium chloride heptahydrate in ionic liquid and solvent-free conditions as 'green' media under mild reaction conditions.
Novel group IV metal precursors and chemical vapor deposition method using thereof
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Example 1, (2008/06/13)
Disclosed herein is an organometallic precursor of a formula M(L)2 for use in formation of metal oxide thin films, in which M is a group IV metal ion having a charge of +4 and L is a tridentate ligand having a charge of -2, the ligand being represented by the following formula (I): wherein each of R1 and R2, independently, is a linear or branched C1~8 alkyl group; and R3 is a linear or branched C1~8 alkylene group. Also, there is disclosed a chemical vapor deposition method which comprises forming a metal oxide thin film on a substrate using the organometallic precursor. The precursor exhibits excellent volatility, thermal property and hydrolytic stability. The precursor is particularly suitable for the deposition of a multi-component metal oxide thin film containing a group IV metal such as titanium.