Results 241 to 250 of about 67,257 (300)

Catalyst-Controlled Chemoselective β-Mannosylation of Phenols Via Attractive Noncovalent Interactions. [PDF]

J Am Chem Soc
Bikovtseva AA, Nielsen MM, Jacobsen EN.
europepmc   +1 more source

Design principles for enantiospecific <i>para</i>- and <i>ortho</i>-[3,3] rearrangements of chiral aryl-allyl ethers.

Org Chem Front
Breinsperger J, Kaiser M, Gärtner P.
europepmc   +1 more source

Substituent Effects

The Journal of Physical Chemistry A, 2005
Inductive and resonance effects of different substituents (CH3, Cl, NH3, CN, NO2) on the reactivity of the nitrogen and oxygen centers of several saturated and unsaturated hydroxylamine derivates toward hard and soft electrophiles are analyzed in terms of various conceptual DFT based descriptors calculated using B3LYP/6-311G** method.
Pratim K, Chattaraj, Nelly, González-Rivas, Myrna H, Matus, Marcelo, Galván   +3 more
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Chemometric Analysis of Substituent Effects. VII. Inductive Effect as a Basic Substituent Effect. Isoeffect Substituent Constant

Collection of Czechoslovak Chemical Communications, 1995
The paper deals with chemometric analysis of the inductive effect. The notion of inductive effect is discussed, and unambiguous definitions are given for the notions of triad: reaction centre-basic skeleton-substituent, and the therewith connected definitions of inductive effect.
Oldřich Pytela, Aleš Halama
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Effect of meta-substituents of phenolic antioxidants—proposal of secondary substituent effect

Polymer Degradation and Stability, 2002
Abstract Phenolic antioxidants were studied extensively in the 1960s. During that time, the action mechanism might have seemed to be clarified completely. Based on our recent study, however, there remain some unclear points on the interpretation of substituent effects.
Yasukazu Ohkatsu
exaly   +2 more sources

The concept of substituent-induced force in the rationale of substituent effect

The Journal of Chemical Physics, 2021
Controlling the thermochemistry and kinetics of chemical reactions is a central problem in chemistry. Among factors permitting this control, the substituent effect constitutes a remarkable example. Here, we develop a model accounting for the effect of a substituent on the potential energy surface of the substrate (i.e., substituted molecule).
Miguel Ángel Fernández-González, Luis Manuel Frutos   +1 more
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An electrostatic scale of substituent resonance effect

Tetrahedron Letters, 2009
Substituent resonance constant, is calculated from substituted benzenes using molecular electrostatic potential (MESP). The reliability of is rigorously verified using isodesmic reactions and found that the energy component of substituent resonance ...
Fareed Bhasha Sayyed, Cherumuttathu H Suresh   +1 more
exaly   +2 more sources

Substituent Effects in the Synthesis of Heterostructures

Inorganic Chemistry, 2021
There have been a number of surprising reports of unexpected products when preparing heterostructures of Bi2Se3 with other 2D layers. These reports prompted us to explore the formation of metastable heterostructures containing Bi2Se3 using X-ray diffraction techniques to follow the reaction pathway.
Marisa A. Choffel, Taryn Mieko Kam, David C. Johnson   +2 more
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