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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Controllable O-Nucleometalation Cyclization Strategy: Access to Divergent Ring-Functionalized Molecules.

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This study introduces vinyl group-assisted palladium catalysis for quickly forming cycloolefins and cyclopropanes from enynes. Different oxidants trigger distinct cyclization pathways, enabling diverse molecular constructions.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Palladium-catalyzed reactions are crucial for C-C bond formation.
  • Enynes are versatile substrates for cyclization reactions.
  • Developing selective and efficient cyclization strategies remains a key challenge.

Purpose of the Study:

  • To report a novel vinyl moiety-assisted selective O-nucleopalladation.
  • To achieve rapid construction of cycloolefins and cyclopropanes via oxidant-induced cyclization of enynes.
  • To explore divergent annulation processes controlled by different oxidants and nucleophilic groups.

Main Methods:

  • Utilized vinyl moiety-assisted O-nucleopalladation.
  • Employed oxidant-induced cyclization of enynes.
  • Investigated the roles of O2 and CuCl2 as oxidants, and amides as nucleophilic activating groups.

Main Results:

  • Achieved rapid synthesis of cycloolefins and cyclopropanes.
  • O2 promoted an unexpected 6-endo-Heck cyclization.
  • CuCl2 facilitated a 5-exo-trig pathway with synergistic SN2-type C-C bond formation.
  • Amides acted as O-transfer nucleophiles, activating alkynes and inducing divergent annulations.
  • Demonstrated the recyclability of regenerated amides for further modifications.

Conclusions:

  • The developed method offers a versatile platform for constructing cyclic compounds.
  • The choice of oxidant dictates the cyclization pathway and product outcome.
  • Amide functionalization provides a handle for further synthetic diversification.