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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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β-Lactam and penicillin substituted mesoionic metal carbene complexes.

Marta G Avello1,2,3, María Moreno-Latorre1,3, María C de la Torre1,3

  • 1Instituto de Química Orgánica General, Consejo Superior de Investigaciones Científicas (IQOG-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain. mc.delatorre@csic.es.

Organic & Biomolecular Chemistry
|March 16, 2022
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New metal complexes (MICs) featuring 1,2,3-triazole rings with penicillin G substituents were synthesized. These gold and platinum complexes show promise as catalysts for organic transformations like enyne cycloisomerization and hydrosilylation.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Medicinal Chemistry

Background:

  • Metal complexes with heterocyclic ligands are crucial in catalysis.
  • 1,2,3-triazoles and beta-lactams (2-azetidinones) are important pharmacophores.
  • Developing novel catalysts for organic synthesis is an ongoing challenge.

Purpose of the Study:

  • To synthesize novel 1,2,3-triazolylidene metal complexes (MICs) incorporating 2-azetidinone and penicillin G moieties.
  • To evaluate the catalytic activity of these synthesized MICs in key organic reactions.

Main Methods:

  • Copper-catalyzed alkyne-azide cycloaddition (CuAAC) for triazole formation.
  • Alkylation of the triazole ring and transmetallation with Au(I), Pd(II), and Pt(II) precursors.
  • Testing catalytic performance in regioselective enyne cycloisomerization and hydrosilylation reactions.

Main Results:

  • Successfully synthesized 1,2,3-triazolylidene MICs with 2-azetidinone and penicillin G substituents.
  • Gold-MIC complexes demonstrated high efficiency in catalyzing regioselective cycloisomerization of enynes.
  • Platinum-MIC complexes proved effective as catalysts in hydrosilylation reactions.

Conclusions:

  • The synthesized 1,2,3-triazolylidene MICs represent a novel class of organometallic catalysts.
  • These complexes offer tunable catalytic properties for valuable organic transformations.
  • The integration of penicillin G substituents may open avenues for related medicinal chemistry applications.