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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...

Alcohols from Carbonyl Compounds: Reduction

Alcohols from Carbonyl Compounds: Reduction

Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

Regioselectivity and Stereochemistry of Hydroboration

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

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Organocatalyzed Birch Reduction Driven by Visible Light.

Justin P Cole¹, Dian-Feng Chen¹, Max Kudisch¹

¹Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States.

Journal of the American Chemical Society

|July 15, 2020

Summary

New organic photoredox catalysts enable metal-free Birch reductions of arenes like benzene using visible light. This breakthrough offers a sustainable method for synthesizing valuable 1,4-cyclohexadienes at ambient temperatures.

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Area of Science:

Organic Chemistry
Photocatalysis
Synthetic Methodology

Background:

The Birch reduction is a key method for converting aromatic compounds into 1,4-cyclohexadienes using solvated electrons.
Traditional Birch reductions require harsh conditions, typically involving alkali metals in ammonia, limiting their application with unactivated arenes like benzene.
Existing photoredox catalysts lack the necessary reduction potential to perform Birch reductions on challenging substrates such as benzene.

Purpose of the Study:

To develop novel organic photoredox catalysts capable of performing Birch reductions under mild, visible-light conditions.
To demonstrate the efficacy of these catalysts in reducing unactivated arenes, including benzene.
To establish a metal-free and sustainable alternative to traditional Birch reduction protocols.

Main Methods:

Introduction of benzo[ghi]perylene imides as organic photoredox catalysts.
Visible-light irradiation using commercially available LEDs to drive the reduction reactions.
Metal-free reaction conditions at ambient temperature.
Mechanistic studies to elucidate the catalytic cycle and energy transfer processes.

Main Results:

Benzene and other functionalized arenes were successfully converted to 1,4-cyclohexadienes in moderate to good yields.
The reactions proceeded efficiently using low catalyst loadings (<1 mol percent).
The process was entirely metal-free and operated under ambient temperature and visible light.
Mechanistic investigations revealed a two-photon energy harvesting mechanism by the organic photoredox catalyst.

Conclusions:

Benzo[ghi]perylene imides function as effective organic photoredox catalysts for Birch reductions.
This methodology enables visible-light-driven, metal-free synthesis of 1,4-cyclohexadienes from arenes at ambient temperature.
The developed catalytic system overcomes the limitations of traditional Birch reductions and existing photoredox catalysts for reducing benzene.