Species with data from:

Lossing, F.P., Free radicals by mass spectrometry. XLV. Ionization potentials and heats of formation of C₃H₃, C₃H₅, and C₄H₇ radicals and ions, Can. J. Chem., 1972, 50, 3973.

23 matching species were found.

For each matching species the following will be displayed:

• Chemical name
• Chemical formula
• Structure image (if available)

Click on the name to see more data.

1. Cyclopentane (C₅H₁₀)
   
2. 1-Pentene (C₅H₁₀)
   
3. 2-Butene, 2-methyl- (C₅H₁₀)
   
4. 2-Pentene, (E)- (C₅H₁₀)
   
5. Propene (C₃H₆)
   
6. 1-Butene (C₄H₈)
   
7. 2-Methyl-1-butene (C₅H₁₀)
   
8. 1-Butene, 3-methyl- (C₅H₁₀)
   
9. 2-Butene, (Z)- (C₄H₈)
   
10. 1-Propene, 2-methyl- (C₄H₈)
    
11. Cyclopropane (C₃H₆)
    
12. Propyne (C₃H₄)
    
13. 1-Butyne (C₄H₆)
    
14. 2-Butyne (C₄H₆)
    
15. Cyclobutane (C₄H₈)
    
16. Allene (C₃H₄)
    
17. Cyclopropane, ethyl- (C₅H₁₀)
    
18. Cyclopropane, 1,1-dimethyl- (C₅H₁₀)
    
19. Methylcyclopropane (C₄H₈)
    
20. Cyclopropene (C₃H₄)
    
21. 2-Methylallyl radical (C₄H₇)
    
22. Propargyl radical (C₃H₃)
    
23. 1-Methylcyclopropyl (C₄H₇)
    

© 2026 by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

Copyright for NIST Standard Reference Data is governed by the Standard Reference Data Act.