One type of this reaction uses hydrochloric acid and zinc amalgam on carbonyls, and another type uses sodium dissolved in liquid ammonia and produces 1,4-cyclohexadienes from benzene.
Carbon dioxide undergoes this type of reaction in the Sabatier process. Another type of this reaction uses borane and the CBS catalyst in a reaction named for Corey and Itsuno. One type of this reaction uses hydrochloric acid and zinc amalgam on carbonyls, and another type uses sodium dissolved in liquid ammonia and produces 1,4-cyclohexadienes from benzene. Sodium borohydride is used for this type of reaction, types of which are named for Clemmensen and Birch. In an electrochemical cell, this reaction occurs at the cathode. For 10 points, name this type of reaction which involves a gain of electrons and is contrasted with oxidation.
Carbon dioxide undergoes this type of reaction in the Sabatier process.
reductions [prompt on redox reactions or reduction-oxidations]