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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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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...
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Ni-Catalyzed Reductive Ring Contraction via Desulfurative Cross-Coupling.

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This study introduces a novel catalytic method for synthesizing complex heterocycles by removing sulfur atoms from C-S-C bonds. The new nickel-catalyzed desulfurization operates under mild conditions, offering a significant advancement in synthetic chemistry.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Heterocyclic Chemistry

Background:

  • Construction of carbon-carbon (C-C) bonds via sulfur atom extrusion from C-S-C motifs is crucial for synthesizing complex heterocycles.
  • Existing homogeneous metal systems for desulfurization require harsh conditions and lack catalytic turnover due to stable sulfido complex formation.

Purpose of the Study:

  • To develop a mild, catalytic method for desulfurization to form C-C bonds.
  • To enable efficient synthesis of a broad range of fused heterocycles.

Main Methods:

  • Utilized an accessible nickel (Ni) precatalyst.
  • Employed inexpensive additives.
  • Performed the reaction under mild conditions.

Main Results:

  • Achieved rapid access to a wide scope of fused heterocycles.
  • Demonstrated a catalytic solution for desulfurization, overcoming limitations of previous methods.
  • Preliminary mechanistic studies provided insights into C-S bond activation and additive effects.

Conclusions:

  • The developed Ni-catalyzed desulfurization offers an efficient and mild route to complex heterocycles.
  • The method presents a significant improvement over existing desulfurization techniques.
  • Understanding the mechanism aids in further optimization and application of this transformation.