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Crossed Aldol Reactions: Overview01:04

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Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.
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The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.
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Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Assessing Intersystem Crossing Rates in Donor- and/Acceptor-Functionalized Corroles: A Computational Study.

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Area of Science:

  • Computational Chemistry
  • Photophysics
  • Materials Science

Background:

  • Intersystem crossing (ISC) and reverse intersystem crossing (RISC) are crucial for harvesting triplet states, influenced by singlet-triplet gap (ΔES-T) and spin-orbit coupling (SOC).
  • Molecular geometry dictates electronic structure, thereby controlling ISC/RISC processes.

Purpose of the Study:

  • To investigate the impact of homo/hetero meso-substitution on the photophysical properties of visible-light-absorbing freebase corroles.
  • To explore the modulation of intersystem crossing (ISC) and reverse intersystem crossing (RISC) rates through functionalization.

Main Methods:

  • Time-dependent density functional theory (TD-DFT) with optimally tuned range-separated hybrid functionals was employed.
  • Calculations incorporated donor (dimethylaniline) and acceptor (pentafluorophenyl) groups.
  • Solvent effects were simulated using the polarizable continuum model (PCM).

Main Results:

  • Substantial ISC rates (∼108 s-1) were observed for both substituted and unsubstituted corroles, comparable to fluorescence rates.
  • Homo-substituted corroles exhibited modest RISC rates (∼104 - 106 s-1), while hetero-substituted corroles showed lower RISC rates (∼103 - 104 s-1).
  • Calculated rates correlated with variations in ΔES-T and SOC, linked to molecular electronic structure.

Conclusions:

  • Both homo- and hetero-substituted corroles demonstrate potential as triplet photosensitizers.
  • The findings provide insights into the photophysical behavior of functional corroles.
  • This study aids in designing heavy-atom-free corroles for applications in lighting, photocatalysis, and photodynamic therapy.