Mechanistic Study of β-Substituent Effects on the Mechanism of Ketone Reduction by SmI2

2002 ◽  
Vol 124 (22) ◽  
pp. 6357-6361 ◽  
Author(s):  
Edamana Prasad ◽  
Robert A. Flowers
Keyword(s):  
Substituent Effects ◽  
Mechanistic Study ◽  
Ketone Reduction

Substituent Effects in the Silylation of Secondary Alcohols: A Mechanistic Study

2018 ◽  
Vol 24 (56) ◽  
pp. 15052-15058 ◽  
Author(s):  
Marta Marin-Luna ◽  
Pascal Patschinski ◽  
Hendrik Zipse
Keyword(s):  
Substituent Effects ◽  
Mechanistic Study ◽  
Secondary Alcohols

Regioselectivity of glycoluril-directed Claisen condensations — A kinetic and mechanistic study of substituent effects in the nucleophilic acyl group

2006 ◽  
Vol 84 (9) ◽  
pp. 1188-1196 ◽  
Author(s):  
Mei Chen ◽  
Katie Won ◽  
Robert S McDonald ◽  
Paul H.M Harrison
Keyword(s):  
Kinetic Data ◽  
Uv Spectroscopy ◽  
Substituent Effects ◽  
Reaction Rates ◽  
Quantitative Yield ◽  
Mechanistic Study ◽  
Claisen Condensation ◽  
Bond Forming ◽  
Rate Limiting

The Claisen-like condensation of a series of 1-arylacetyl-6-acetyl-3,4,7,8-tetramethylglycolurils (Ar = Ph, p-OMeC6H4, and p-ClC6H4) was studied in preparative experiments and by analysis of kinetic data. The reactions proceeded in virtually quantitative yield and were highly regioselective: the corresponding N-(2′-aryl-3′-ketobutanoyl)-3,4,7,8-tetramethylglycolurils were obtained in all cases, with none of the 4′-aryl regioisomers being detected. Clean bimolecular kinetics were observed for each conversion using UV spectroscopy. Reaction rates followed the order Ar = p-OMeC6H4 < Ph < p-ClC6H4. The results are explained by a mechanism in which the deprotonation of the substrates is rate-limiting; thus, deprotonation of the arylacetyl groups is favoured. The ensuing enolate reacts rapidly in the C–C bond-forming step.Key words: glycoluril, biomimetic, Claisen condensation, regioselectivity, kinetics, mechanism, substituent effects.

Unexpected Substituent Effects in the Iso-Heterocyclic Boulton–Katritzky Rearrangement of 3-Aroylamino-5-methyl-1,2,4-oxadiazoles: A Mechanistic Study

2019 ◽  
Vol 123 (46) ◽  
pp. 10004-10010
Author(s):  
Vincenzo Frenna ◽  
Paolo Lo Meo ◽  
Antonio Palumbo Piccionello ◽  
Domenico Spinelli
Keyword(s):  
Substituent Effects ◽  
Mechanistic Study

scholarly journals A Mechanistic Study on the Tautomerism of H-Phosphonates, H-Phosphinates and Secondary Phosphine Oxides

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3859 ◽  
Author(s):  
Daniella Vincze ◽  
Péter Ábrányi-Balogh ◽  
Péter Bagi ◽  
György Keglevich
Keyword(s):  
Molecular Descriptors ◽  
Substituent Effects ◽  
Building Blocks ◽  
Mechanistic Study ◽  
Secondary Phosphine ◽  
Phosphine Oxides ◽  
Dft Methods ◽  
Implicit Solvents ◽  
Different Levels ◽  
P Ligands

H-phosphonates, H-phosphinates and secondary phosphine oxides may be preligands, and are important building blocks in the synthesis of pharmaceuticals, pesticides, and P-ligands. The prototropic tautomerism influenced by substituent effects plays an important role in the reactivity of these species. The main goal of our research was to study the tautomerism of the >P(O)H reagents by means of computational investigations applying several DFT methods at different levels. We focused on the effect of implicit solvents, and on explaining the observed trends with physical chemical molecular descriptors. In addition, multiple reaction pathways incorporating three P-molecules were elucidated for the mechanism of the interconversion.

Mechanistic study of proliferation induced by Angelica sinensis in gastric epithelial cells

2001 ◽  
Vol 120 (5) ◽  
pp. A145-A145
Author(s):  
C CHO ◽  
Y YE ◽  
E LIU ◽  
V SHIN ◽  
N SHAM
Keyword(s):  
Epithelial Cells ◽  
Mechanistic Study ◽  
Angelica Sinensis ◽  
Gastric Epithelial Cells

Substituent effects and solvents

1992 ◽  
Vol 89 ◽  
pp. 1567-1571
Author(s):  
O Pytela ◽  
M Ludwig
Keyword(s):  
Substituent Effects

Mechanistic study on the cardioprotective and chemosensitizing effects of a novel danshensu derivative

Planta Medica ◽  
2014 ◽  
Vol 80 (16) ◽  
Author(s):  
L Wang ◽  
L Shan ◽  
G Cui ◽  
Y Chen ◽  
J li ◽  
...  
Keyword(s):  
Mechanistic Study
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