# IUPAC naming of isocyanides

What is the IUPAC name of isocyanide : isonitrile or carbylamine?

Are "methyl isocyanide" and "carbylamine" the same thing?

• Note that carbylamines is an obsolete and deprecated name for isocyanides (isonitriles). – mykhal Jan 11 '19 at 18:32

The most recent IUPAC recommendations[1] states that:

P-61.9: Preferred IUPAC names are formed substitutively using the prefix ‘isocyano’ attached directly to a parent hydride.

This is a change from previous recommendations, and differs from some of your examples above.

To give a concrete example, $\ce{C6H5NC}$ should be named isocyanobenzene - this is known as a PIN by IUPAC (preferred IUPAC name). Phenylisocyanide is also acknowledged as an acceptable trivial name (a name that does not conform to the recommendations but is still commonly used).

[1]: IUPAC Recommendations for Preferred Names 2013, Chapter P-6. DOI:10.1039/9781849733069-00648

• Can I get an example of an open chain compound with isocyanide group IUPAC name attaching suffix – Sounak Biswas Nov 30 '17 at 8:15
• Isocyanoethane. The nomenclature system is universal, you just need to know the correct prefix. – NotEvans. Nov 30 '17 at 15:08
• Okay that means in case of isocyanide we will not use suffix but in case of cyanides we will still use the suffix "nitriles" – Sounak Biswas Nov 30 '17 at 16:56