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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
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Hydrogen Shift Reactions in Nonhydrocarbon Peroxy Radicals.

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Heteroatoms significantly accelerate hydrogen shift reactions in organic peroxy radicals, influencing the formation of oxygenated molecules. This impacts secondary organic aerosol formation in atmospheric chemistry.

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Area of Science:

  • Atmospheric Chemistry
  • Chemical Kinetics
  • Organic Chemistry

Background:

  • Hydrogen shift reactions are key steps in volatile organic compound (VOC) autoxidation.
  • These reactions form highly oxygenated organic molecules (HOMs), contributing to secondary organic aerosol (SOA).
  • H-shift chemistry in hydrocarbon peroxy radicals (RO2) is known, but heteroatom effects are understudied.

Purpose of the Study:

  • To investigate the impact of heteroatoms (O, N, S, P) on H-shift reactions in peroxy radicals (RO2).
  • To calculate H-shift rate coefficients for heteroatom-containing RO2 radicals.
  • To understand how heteroatom position influences H-shift reactivity and selectivity.

Main Methods:

  • Utilized a multiconformer transition state theory approach.
  • Calculated H-shift rate coefficients for various heteroatom-containing RO2 radicals.
  • Analyzed steric, inductive, and stereoelectronic effects on reaction trends.

Main Results:

  • Heteroatoms were found to accelerate H-shift reactions, especially when positioned alpha to the abstraction site.
  • Reactions with beta-positioned heteroatoms showed rates similar to hydrocarbons.
  • Large H-shift spans involving heteroatoms resulted in faster reactions compared to hydrocarbons.
  • For ethers, 1,8 H-shifts were as fast as 1,5 H-shifts, competing with bimolecular reactions.

Conclusions:

  • Heteroatom incorporation significantly alters H-shift reaction rates and selectivity in RO2 radicals.
  • Isomerization reactions involving non-hydrocarbon peroxy radicals are crucial in atmospheric chemistry.
  • Findings provide insights into HOM formation and SOA production pathways.