Light-driven method puts notoriously reactive hydrogen atoms to work for chemical synthesis
Hydrogen is the simplest element in the periodic table, consisting of just one proton and one electron. In chemistry, however, the smallest of atoms is anything but simple. First produced by Nobel laureate Irving Langmuir over a century ago, single hydrogen atoms (H•) are so reactive that they are almost impossible to prepare and use.
Hydrogen, the simplest element in the periodic table, is notorious for its extreme reactivity, making it challenging to prepare and utilize in chemical synthesis. Researchers from the Max Planck Institute of Colloids and Interfaces, University College London, and Imperial College London have discovered a light-driven method to generate hydrogen atoms under mild conditions, yielding significant potential for organic synthesis.
The team combined hydrazine with a thiophenol derivative and exposed the mixture to light. The energy from the light triggered an electron transfer between the two molecules, resulting in the formation of a short-lived Rydberg radical intermediate, which decays to release a hydrogen radical. The hydrogen radical can then be used to reduce various organic molecules under mild, metal-free conditions, including highly functionalized alkenes and halogen compounds.
This innovative approach opens up new possibilities for synthetic chemists, as the discovery of new chemical intermediates expands the range of possibilities for organic chemistry. The researchers believe that the unusual reactivity of hydrogen atoms could prove valuable in other areas of organic chemistry and potentially in biological sciences as well.
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