scholarly journals Conformational Preference of 2′-Fluoro-Substituted Acetophenone Derivatives Revealed by Through-Space 1H–19F and 13C–19F Spin–Spin Couplings

2021 ◽  
Author(s):  
Chinatsu Otake ◽  
Takuya Namba ◽  
Hidetsugu Tabata ◽  
Kosho Makino ◽  
Kiriko Hirano ◽  
...  
Keyword(s):  
Conformational Preference ◽  
Acetophenone Derivatives

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.

scholarly journals Design of Iridium N-Heterocyclic Carbene Amino Acid Catalysts for Asymmetric Transfer Hydrogenation of Aryl Ketones

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 671
Author(s):  
Chad M. Bernier ◽  
Joseph S. Merola
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Enantiomeric Excess ◽  
Transfer Hydrogenation ◽  
Acid Catalysts ◽  
Asymmetric Transfer Hydrogenation ◽  
Reaction Conditions ◽  
Chiral Complexes ◽  
Acetophenone Derivatives ◽  
Aryl Ketones

A series of chiral complexes of the form Ir(NHC)2(aa)(H)(X) (NHC = N-heterocyclic carbene, aa = chelated amino acid, X = halide) was synthesized by oxidative addition of -amino acids to iridium(I) bis-NHC compounds and screened for asymmetric transfer hydrogenation of ketones. Following optimization of the reaction conditions, NHC, and amino acid ligands, high enantioselectivity was achieved when employing the Ir(IMe)2(l-Pro)(H)(I) catalyst (IMe = 1,3-dimethylimidazol-2-ylidene), which asymmetrically reduces a range of acetophenone derivatives in up to 95% enantiomeric excess.

Fluorescence analysis of iodinated acetophenone derivatives

2015 ◽  
Vol 139 ◽  
pp. 63-67 ◽  
Author(s):  
F. Crivelaro ◽  
M.R.S. Oliveira ◽  
S.M. Lima ◽  
L.H.C. Andrade ◽  
G.A. Casagrande ◽  
...  
Keyword(s):  
Fluorescence Analysis ◽  
Acetophenone Derivatives

Synthesis of new boron complexes: application to transfer hydrogenation of acetophenone derivatives

2011 ◽  
Vol 25 (5) ◽  
pp. 390-394 ◽  
Author(s):  
Ahmet Kilic ◽  
Cezmi Kayan ◽  
Murat Aydemir ◽  
Feyyaz Durap ◽  
Mustaf Durgun ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Acetophenone Derivatives ◽  
Boron Complexes

scholarly journals Intramolecular [2π+2π]-Photocyclization and Conformational Preference of 5-(2-Benzo[b]thienyl)-5-ethoxy-5H-dibenzo[a,d]cycloheptene

Heterocycles ◽  
2013 ◽  
Vol 87 (6) ◽  
pp. 1319
Author(s):  
Keiji Kobayashi ◽  
Motoko Akita ◽  
Sin-ya Mohri ◽  
Mai Takahashi
Keyword(s):  
Conformational Preference
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