What is the mechanics behind hydrogenation with H2 molecules?

  1. If there is a molecule that is negatively charged after gaining an electron and it only needs one hydrogen to be hydrogenated, in the presence of H2 will one of the hydrogen leave the hydrogen pair to hydrogenate the negatively charged molecule? Or does the hydrogen have to be already separated, such as being donated from an acid?

    I would figure that H2 can readily donate a single hydrogen atom if there is a negatively charged molecule that just received an electron and is able to be hydrogenated. How does this work?
     
  2. jcsd
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