1. Introduction
2. Observations
3. Results
3.1. Energetics of the cyano derivatives of propene
3.2. Detection of trans and cis-crotononitrile (t/c-CH₃CHCHCN)
3.3. Detection of methacrylonitrile $(CH₂C(CH₃)CN)$
3.4. Detection of gauche and cis-allyl cyanide $(g/c{\cdot}CH₂CHCH₂CN)$
4. Discussion
5. Conclusions