In chemistry, a carbene is a molecule containing a neutral carbon atom with a valence of two and two unshared valence electrons. The general formula is R-(C:)-R` or R=C:. The term `carbene` may also refer to the specific compound H2C:, also called methylene, the parent hydride from which all other carbene compounds are formally derived. Carbene......
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http://en.wikipedia.org/wiki/Carbene
any member of a class of highly reactive molecules containing divalent carbon atoms—that is, carbon atoms that utilize only two of the four bonds ...
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http://www.britannica.com/eb/a-z/c/22
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