Benzonitrile
Benzonitrile is the chemical compound with the formula Template:Chem2, abbreviated PhCN. This aromatic organic compound is a colorless liquid with a sweet bitter almond odour. It is mainly used as a precursor to the resin benzoguanamine.
Production and reactionsEdit
It is prepared by ammoxidation of toluene, that is its reaction with ammonia and oxygen (or air) at Template:Convert.<ref>Template:Cite journal</ref>
In the laboratory it can be prepared by the dehydration of benzamide or benzaldehyde oxime<ref>Template:Cite journal</ref> or by the Rosenmund–von Braun reaction using cuprous cyanide or NaCN/DMSO and bromobenzene.
Hydrogenation of benzonitrile in principle gives benzylamine, but owing to transamination, dibenzylamine and tribenzylamine are also produced.
ApplicationsEdit
Laboratory usesEdit
Benzonitrile is a useful solvent and a versatile precursor to many derivatives. It reacts with amines to afford N-substituted benzamides after hydrolysis.<ref>Template:OrgSynth</ref> It is a precursor to diphenylmethanimine via reaction with phenylmagnesium bromide followed by methanolysis.<ref>Template:OrgSynth</ref>
Benzonitrile forms coordination complexes with transition metals that are both soluble in organic solvents and conveniently labile. One example is [[Bis(benzonitrile)palladium dichloride|Template:Chem2]]. The benzonitrile ligands are readily displaced by stronger ligands, making benzonitrile complexes useful synthetic intermediates.<ref>Template:Cite book</ref>
HistoryEdit
Benzonitrile was reported by Hermann Fehling in 1844. He found the compound as a product from the thermal dehydration of ammonium benzoate. He deduced its structure from the already known analogue reaction of ammonium formate yielding hydrogen cyanide (formonitrile). He also coined the name benzonitrile which gave the name to all the group of nitriles.<ref>Template:Cite journal</ref>
In 2018, benzonitrile was reported to be detected in the interstellar medium.<ref name="SC-20180112">Template:Cite journal</ref>
ReferencesEdit
External linksEdit
Template:Molecules detected in outer space Template:Authority control