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Does it reduce it to benzene like $\ce{LiAlH4}$ does? Any source for this reaction?

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    $\begingroup$ organic-chemistry.org/namedreactions/ullmann-reaction.shtm $\endgroup$
    – user96208
    Commented Aug 9, 2020 at 11:30
  • $\begingroup$ I saw that but it says copper solid not positive ion unless I’m not seeing it can you tell me the section ? $\endgroup$
    – lidya
    Commented Aug 9, 2020 at 12:36
  • $\begingroup$ Under the "Mechanism of the Ullmann Reaction" section, The active species is a copper(I)-compound which undergoes oxidative addition with the second equivalent of halide, followed by reductive elimination and the formation of the aryl-aryl carbon bond. Also, there must be some Cu present $\endgroup$
    – user96208
    Commented Aug 9, 2020 at 12:57
  • $\begingroup$ You need a nucleophile to replace iodide here. For example: $$\ce{Ar-Br + CuCN ->[solvent][\Delta, \gt \pu{125 ^\circ C}] Ar-CN}$$ I have done this with 60% yield. $\endgroup$ Commented Aug 9, 2020 at 16:42
  • $\begingroup$ For a room temperature Ullmann reaction, see: pubs.acs.org/doi/abs/10.1021/ja00522a058 $\endgroup$
    – user55119
    Commented Aug 10, 2020 at 0:43

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