
Hydrogenolysis is a chemical reaction whereby a carbon–carbon or carbon–heteroatom single bond is cleaved or undergoes `lysis` by hydrogen. The heteroatom may vary, but it usually is oxygen, nitrogen, or sulfur. A related reaction is hydrogenation, where hydrogen is added to the molecule, without cleaving bonds. Usually hydrogenolysis is con.....
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http://en.wikipedia.org/wiki/Hydrogenolysis

(from the article `hydrogenation`) ...simply adds to a double or triple bond connecting two atoms in the structure of the molecule or one in which the addition of hydrogen results in ...
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http://www.britannica.com/eb/a-z/h/89

decomposition of a compound resulting from its interaction with hydrogen.
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https://www.infoplease.com/dictionary/hydrogenolysis
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