ChemInform Abstract: Graphite as an Effective Catalyst for Michael Addition of Indoles to Nitroolefins in Aqueous Alcoholic Solution.

ChemInform ◽  
2015 ◽  
Vol 46 (30) ◽  
pp. no-no
Author(s):  
Sonia B. Parsekar ◽  
Sneha Naik ◽  
Mayuri M. Naik ◽  
Santosh G. Tilve
Keyword(s):  
Michael Addition ◽  
Alcoholic Solution ◽  
Effective Catalyst ◽  
Aqueous Alcoholic Solution

l-Prolinal Dithioacetal: A Highly Effective Organocatalyst for the Direct Nitro-Michael Addition to Selected Cyclic and Aromatic Ketones

Synthesis ◽  
2019 ◽  
Vol 51 (17) ◽  
pp. 3356-3368
Author(s):  
Piotr Pomarański ◽  
Zbigniew Czarnocki
Keyword(s):  
Michael Addition ◽  
Ring Size ◽  
Cyclic Ketones ◽  
Asymmetric Syntheses ◽  
Aromatic Ketones ◽  
Ring Systems ◽  
Effective Catalyst ◽  
Acetophenone Derivatives ◽  
Highly Effective ◽  
Related Compounds

The synthesis of novel l-prolinal dithioacetal and its application as an organocatalyst for the direct Michael addition of cyclic ketones and acetophenone derivatives to trans-β-nitrostyrene and related compounds is described. The prolinal dithioacetal acts as effective catalyst in the case of cyclic ketones of different ring size, in particular five- and six-membered examples, as well as larger and smaller ring systems. High enantioselectivity and diastereoselectivity is observed for different substrates and trans-β-nitrostyrenes. Also, the first asymmetric syntheses of selected 2-methyl-4-nitro-1,3-diphenylbutan-1-one derivatives by application of the obtained organocatalyst is presented.

Correction: Noyori's Ts-DPEN Ligand: Simple yet Effective Catalyst for the Highly Enantioselective Michael Addition of Acetone to Nitroalkenes

2010 ◽  
Vol 2010 (15) ◽  
pp. 2978-2978
Author(s):  
Lin Peng ◽  
Xiao-Ying Xu ◽  
Liang-Liang Wang ◽  
Jun Huang ◽  
Jian-Fei Bai ◽  
...  
Keyword(s):  
Michael Addition ◽  
Effective Catalyst

ChemInform Abstract: Noyori′s Ts-DPEN Ligand: Simple Yet Effective Catalyst for the Highly Enantioselective Michael Addition of Acetone to Nitroalkenes.

ChemInform ◽  
2010 ◽  
Vol 41 (35) ◽  
pp. no-no
Author(s):  
Lin Peng ◽  
Xiao-Ying Xu ◽  
Liang-Liang Wang ◽  
Jun Huang ◽  
Jian-Fei Bai ◽  
...  
Keyword(s):  
Michael Addition ◽  
Effective Catalyst

Complexes de Cu(II), Co(II), Ni(II) et UO2(II) avec les bases de Schiff N-(4-méthyl-2-pyridyI)salicylaldimine et N-(6-méthyl-2-pyridyl)salicylaldimine

1982 ◽  
Vol 60 (13) ◽  
pp. 1713-1719 ◽  
Author(s):  
L. F. Capitán-Vallvey ◽  
C. Jiménez ◽  
L. Cuadros
Keyword(s):  
Schiff Bases ◽  
Alcoholic Solution ◽  
Modes Of Action ◽  
Aqueous Alcoholic Solution

We have isolated the complexes of the Schiff bases N-(4-methyl-2-pyridyl)salicylaldimine and N-(6-methyl-2-pyridyl)salicylaldimine with Co(II), Ni(II), Cu(II), and UO2(II) in both aqueous alcoholic and absolute alcoholic solutions. We note different modes of action of these Schiff bases according to the medium used. However, in aqueous alcoholic solution the complexes mentioned have a remarkable capacity for reaction with the substances in solution. We propose two new gravimetric methods for Ni(II) and UO2(II). [Journal Translation]

Mass spectral studies of lanthanide chelates. II. Lanthanide chelates of three fluorinated β-diketones

1976 ◽  
Vol 29 (8) ◽  
pp. 1845 ◽  
Author(s):  
SE Livingstone ◽  
WA Zimmermann
Keyword(s):  
Mass Spectrometer ◽  
Mass Spectra ◽  
Nitrate Solution ◽  
Alcoholic Solution ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Lanthanide Nitrate ◽  
Aqueous Alcoholic Solution ◽  
Lanthanide Chelates ◽  
Chemical Behaviour

The lanthanide chelates MetL3,nH2O (Met = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, or Yb; L = PhCO= CHCOCF3, p-MeC6H4CO=CHCOCF3, p-MeOC6H4CO=CHCOCF3; n = 2, 3 or 1) have been isolated. The conditions were found to be critical, involving the slow addition of an ammoniacal aqueous alcoholic solution of the β-diketone to an excess of the lanthanide nitrate solution while the pH was maintained within the range 6.0-6.5. The mass spectra of most of the chelates were obtained and were essentially similar and fluorine migration to the metal was found to occur. Although a peak for the ion M-L (M = MetL3+) is present in the spectra, peaks for M-2L and M-3L are absent; however, peaks were obtained for the ions M-2L+ F and M-3L+2F (Met111F2). A peak for the ion M- L+ F (Met11F) was obtained when Met = Sm, Eu and Yb. The valency change from 3 to 2 occurring in the mass spectrometer in the case of samarium, europium and ytterbium is in accordance with their chemical behaviour in solution.

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