Editing Carbide (section)

====Methanides====
Methanides are a subset of carbides distinguished by their tendency to decompose in water producing [[methane]]. Three examples are [[aluminium carbide]] {{chem2|Al4C3}}, [[magnesium carbide]] {{chem2|Mg2C}}<ref>{{cite journal|title=Synthesis of Mg2C: A Magnesium Methanide|author1=O.O. Kurakevych |author2=T.A. Strobel |author3=D.Y. Kim |author4=G.D. Cody |volume =52|issue=34|year=2013|pages=8930–8933|journal=Angewandte Chemie International Edition|doi=10.1002/anie.201303463|pmid = 23824698}}</ref> and [[beryllium carbide]] {{chem2|Be2C}}.

Transition metal carbides are not saline: their reaction with water is very slow and is usually neglected. For example, depending on surface porosity, 5–30 atomic layers of [[titanium carbide]] are hydrolyzed, forming [[methane]] within 5 minutes at ambient conditions, following by saturation of the reaction.<ref>{{cite journal|url=https://link.springer.com/article/10.1007%2FBF00780135|title=Reaction of titanium carbide with water|author1=A. I. Avgustinik |author2=G. V. Drozdetskaya |author3=S. S. Ordan'yan |volume =6|issue=6|year=1967|pages=470–473|journal=Powder Metallurgy and Metal Ceramics|doi=10.1007/BF00780135|s2cid=134209836}}</ref>

Note that methanide in this context is a trivial historical name. According to the IUPAC systematic naming conventions, a compound such as NaCH<sub>3</sub> would be termed a "methanide", although this compound is often called methylsodium.<ref name="WeissCorbelin1990">{{cite journal|last1=Weiss|first1=Erwin|last2=Corbelin|first2=Siegfried|last3=Cockcroft|first3=Jeremy Karl|last4=Fitch|first4=Andrew Nicholas|title=Über Metallalkyl- und -aryl-Verbindungen, 44 Darstellung und Struktur von Methylnatrium. Strukturbestimmung an NaCD3-Pulvern bei 1.5 und 300 K durch Neutronen- und Synchrotronstrahlenbeugung|journal=Chemische Berichte|volume=123|issue=8|year=1990|pages=1629–1634|issn=0009-2940|doi=10.1002/cber.19901230807}}</ref> See [[Methyl group#Methyl anion]] for more information about the {{chem2|CH3-}} anion.