Editing Group 7 element (section)

==== Manganese ====

{{Main article|Organomanganese chemistry}}

Organomanganese compounds were first reported in 1937 by Gilman and Bailee who described the reaction of [[phenyllithium]] and [[manganese(II) iodide]] to form phenylmanganese iodide (PhMnI) and diphenylmanganese (Ph<sub>2</sub>Mn).<ref name="Cahiez2009">{{cite journal|title=Chemistry of Organomanganese(II) Compounds|first1=Gerard|last1=Cahiez|first2=Christophe|last2=Duplais|first3=Julien|last3=Buendia|journal=[[Chem. Rev.]]|year=2009|volume=109 |issue=3 |pages=1434–1476 |doi=10.1021/cr800341a|pmid=19209933 }}</ref>

Following this precedent, other organomanganese halides can be obtained by alkylation of [[manganese(II) chloride]], [[manganese(II) bromide]], and [[manganese(II) iodide]].  Manganese iodide is attractive because the anhydrous compound can be prepared in situ from manganese and [[iodine]] in [[diethyl ether|ether]]. Typical alkylating agents are [[organolithium]] or [[organomagnesium]] compounds.

The chemistry of organometallic compounds of Mn(II) are unusual among the [[transition metal]]s due to the high ionic character of the Mn(II)-C bond.<ref>{{cite journal|first=Richard A.|last=Layfield|title=Manganese(II): The Black Sheep of the Organometallic Family|journal=[[Chem. Soc. Rev.]]|year=2008 |volume=37|issue=6|pages=1098–1107 |doi=10.1039/b708850g |pmid=18497923 }}</ref> The reactivity of organomanganese compounds can be compared to that of [[Organomagnesium chemistry|organomagnesium]] and [[organozinc compound]]s. The [[electronegativity]] of Mn (1.55) is comparable to that of Mg (1.31) and Zn (1.65), making the carbon atom (EN = 2.55) [[nucleophilic]]. The [[reduction potential]] of Mn is also intermediate between Mg and Zn.