The regio- and stereoselective addition of dibromocarbene and dichlorocarbene onto β-himachalene

In this work we used DFT B3LYP/6-31G (d) to study the mechanism, the regio- and stereoselectivity of the [1+2] cycloaddition reaction between β-himachalene and dihalogenocarbene. Analysis of the reactivity indices and calculation of the activation energies of the transition states showed that this reaction is stereoselectives, the treatment of β-himachalene with one equivalent of dibromocarbene leads via an exothermic reaction to the formation of a single product P1 resulting from the attack of the most substituted double bond C6=C7 of β-himachalene. Treatment of product P1 with one equivalent of dichlorocarbene leads, again via an exothermic reaction, to formation of the two products P3 and P4, but dibromocarbene does not react with the product P1 due to the high activation energy of this reaction

Understanding the Regioselectivity and Reactivity of Friedel–Crafts benzoylation Using Parr Functions

A theoretical study of the reactivity and regioselectivity of some aromatic compounds in electrophilic aromatic substitution is carried out at the B3LYP/6-31G(d) computational level. The relative reactivity of these systems is rationalized by means of the global nucleophilicity index proposed by Domingo’s group. The positional selectivity, namely o, m or p, is predicted by means of the local nucleophilicity indices [Parr fonctions]. The present study shows that the experimental trends of the relative reactivities and regioselectivities of these reactions are correctly predicted using Parr fonctions

A theoretical investigation of the reactivity and regioselectivity of triterpene derivatives using difference local index, Parr functions.

A theoretical study of the reactivity and regioselectivity of thiosemicarbazide (TSC) condensation toward some carbonyl triterpenes was carried out using density functional theory with B3LYP/6-31G(d,p). The relative reactivity of these systems was rationalized by means of the global electrophilicity index. Positional selectivity, namely C3, C7 and C11, were evaluated using difference index Rk, Parr functions and difference of Parr function. The present study showed that the experimental results of the relative reactivity and regioselectivity of these reactions were correctly predicted using difference index Rk, Parr functions and difference of Parr function

A DFT study of the mechanism and regioselectivity of the reaction between diethyl trichloro-methyl phosphonate and diphenyl methyl phosphinite

The reaction of diethyl trichloro-methyl phosphonate (C1) with diphenyl methyl phosphinite (C2), has been scrutinized within the Density Function Theory at the B3LYP/6-311(d,p) computational level. The regiosomeric reaction paths involving the two center of compound (C1) have been studied. DFT calculations account for the high regioselectivity in the chlorine atom, in complete agreement with the experimental outcomes

Preface

Computer Graphics, Imaging and Visualization (CGiV) combined are used in some form or of the applications in this age and time. New applications show strong trends from graphics, imaging, and visualisation. There are exciting explorations of theories and applications to a wide range of disciplines including social media, geo-sociology, health, business, security and more. Statistical analysis of literature illustrates that the chasm between academia and industries is abridged as applications becoming more innovative and driving new research activities

The mechanism, the chemoselectivity and the regioselectivity of the 1-Benzyl-4-ethynyl-1H-[1,2,3]triazole and 1-Azidomethyl-4-tert-butyl-benzene in [3+2] cycloaddition reactions: a DFT study

The [3 + 2] cycloaddition (32CA) reaction between the 1-Benzyl-4-ethynyl-1H-[1,2,3]triazole and 1-Azidomethyl-4-tert-butyl-benzen has been studied within the Density Functional Theory (DFT) B3LYP/6-311G(d,p) computational level. Analysis of the conceptual DFT reactivity indices allows the explanation of the reactivity, and the chemo- and regioselectivity experimentally observed. The possible chemoselective channels and ortho/meta regioselective channels were explored and characterized. Analysis of the energies associated with the different reaction pathways indicates that the 32CA reactions of the between the 1-benzyl-4-ethynyl-1H-[1,2,3]triazole and 1-azidomethyl-4-tert-butyl-benzene is highly chemioselective and meta regioselectivitie, in agreement with the experimental outcomes