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Metals Covalently Bonded to Benzene

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I've noticed that my book does not mention metals as a possible substituent for mono-substituted benzenes, but it doesn't begin to explain why. Also I have had trouble finding reasons why online. Specifically I am interested to know why you don't see metals bonded to benzene with a covalent sigma bond. I am not interested in metal benzene complexes. As much in depth help that anyone can offer would be greatly appreciated.

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The expert examines metals covalently bonded to benzene. Covalent sigma bond of benzene is determined.

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Two of the most commonly used examples of benzene-metal bonds directly to the carbon of benzene are as follows:

As you implied in your post, examples of benzene bonding to metals through its -bonds abound in the literature. Bonds of metals directly to a carbon of a benzene ring are far less common. The examples above (the structures in short form are PhMgBr and PhLi, where Ph represents a "phenyl" group - C6H5) have the metal directly bonded to the C of the benzene ring, but the bond would not be classified as covalent. On the bonding continuum (covalent, polar covalent, ionic), I would place them somewhere between polar covalent and ionic, but closer to ionic. The reason is for ...

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