Unexpectedly stable is ethynyl isocyanide 1, the parent compound of the hither-to unknown alkynyl isocyanides. It is storable at −196°C for several weeks and at room temperature for several days in the gas phase. Compound 1 is obtained by flash vacuum pyrolysis of the chromium complex 2. The microwave data of 1 described in this communication enabled it to be detected (after submission of this paper) in interstellar space by radioastronomy where other nitrogen-containing isomeric pairs consisting of uncharged closed-shell molecules, as well as its isomer HCCN, abound.
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Krüger et al. (1991) studied this question.
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