What is meant by Fisher carbene complex?

Answer Posted / ramesh

Carbene ligands possess a metal-carbon double bond and are
closely related to alkylidenes. Carbene ligands (B) have a
heteroatom substituent unlike alkylidenes (A) which usually
have alkyl substituents on the alpha carbon atom:

These are sometimes called Fischer carbenes in honor of E.O.
Fischer, who reported the first example in 1964 and later
won a Nobel Prize for his pioneering work on ferrocene with
Wilkinson.

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