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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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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.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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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Surface ligand-directed pair-wise hydrogenation for heterogeneous phase hyperpolarization.

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Para-hydrogen induced polarization (PHIP) enhances magnetic resonance imaging signals. This study achieved record polarization in water using platinum nanoparticle catalysts, enabling new medical imaging contrast agents.

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Area of Science:

  • Magnetic Resonance Imaging
  • Hyperpolarization Techniques
  • Nanotechnology

Background:

  • Magnetic resonance (MR) signal intensity is limited by conventional magnets.
  • Hyperpolarization techniques aim to overcome these sensitivity limitations.
  • Para-hydrogen induced polarization (PHIP) utilizes the para-spin state of hydrogen to dramatically enhance MR signals.

Purpose of the Study:

  • To develop and present novel platinum nanoparticle catalysts for PHIP.
  • To achieve the highest reported polarization levels in water using PHIP.
  • To explore the potential of PHIP for creating advanced medical imaging contrast agents.

Main Methods:

  • Synthesis of platinum nanoparticles capped with cysteine.
  • Application of para-hydrogen induced polarization (PHIP) technique.
  • Measurement of hyperpolarized signal intensities in aqueous solutions.

Main Results:

  • Platinum nanoparticle-cysteine catalysts were successfully synthesized and characterized.
  • Achieved unprecedented levels of para-hydrogen induced polarization in water.
  • Demonstrated significantly higher signal intensities compared to conventional MR methods.

Conclusions:

  • Platinum nanoparticle catalysts are effective for PHIP in water.
  • The achieved polarization levels represent a significant advancement in MR sensitivity.
  • This work paves the way for developing novel PHIP-based contrast agents for medical imaging.