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Predicting Reaction Outcomes02:24

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
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Aldehydes are more reactive than carboxylic acids and hence, can get over-reduced to alcohol in the presence of strong reducing agents. Therefore, carboxylic acids are inefficient in preparing aldehydes using LAH.
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Carboxylic acid derivatives such as acid halides, anhydrides, esters, and amides undergo nucleophilic acyl substitution reactions with varying degrees of reactivity.
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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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How predictive could alchemical derivatives be?

Macarena Muñoz1, Carlos Cárdenas

  • 1Departamento de Física, Facultad de Ciencias, Universidad de Chile, 653-Santiago, Chile. mackadelpilar@gmail.com cardena@macul.ciencias.uchile.cl.

Physical Chemistry Chemical Physics : PCCP
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Summary

Alchemical derivatives predict compound energies by approximating changes. Including polarization is crucial for accuracy, as neglecting it leads to failures. The method works best for small, single-atom substitutions.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Quantum chemistry

Background:

  • The vast chemical space necessitates efficient navigation tools for rational compound design.
  • Ab initio alchemical derivatives offer a non-empirical approach to explore chemical space via transformations.
  • Alchemical transformations are modeled as perturbative energy expansions based on stoichiometry.

Purpose of the Study:

  • To assess the efficacy of alchemical derivatives in predicting energy changes due to composition modifications.
  • To incorporate electrostatic, polarization, and electron-transfer effects into alchemical derivative calculations.
  • To evaluate the performance of alchemical derivatives on a challenging system (Al13-xSix) where no single effect dominates.

Main Methods:

  • Constructing alchemical transformations as perturbative energy expansions with respect to stoichiometric changes.
  • Calculating alchemical derivatives including electrostatic, polarization, and electron-transfer effects.
  • Studying substitutional doping of Al13 with Si (Al13-nSin) for both isoelectronic and non-isoelectronic transformations.

Main Results:

  • Polarization effects are critical and cannot be neglected for accurate energy predictions; their omission leads to significant errors.
  • The perturbative approach of alchemical derivatives fails for isoelectronic substitutions of four or more atoms due to convergence issues.
  • Alchemical derivatives effectively rank isomers by energy when only one atom is mutated at a time.
  • For non-isoelectronic transformations, the series diverges rapidly with increasing electron count, highlighting the need for small transmutation degrees.

Conclusions:

  • Accurate prediction of energy changes in chemical space navigation requires the inclusion of polarization effects.
  • Alchemical derivatives are a promising tool for exploring chemical space, particularly for small, single-atom substitutions.
  • The limitations of alchemical derivatives for extensive substitutions emphasize the need for careful application and potential alternative methods for complex systems.