Three salts of cyclopropenyl cation (I) have been prepared from 3-chlorocyclopropene. The nmr spectrum of the cation is consistent with expectations, and the infrared spectrum has only four bands which have been assigned to the four allowed modes for a molecule with D3h symmetry. The PKR+ of I was determined to be –7.4 ± 0.1 by an nmr method. Comparison with an estimated pKR+ for allyl cation shows that I is 18 kcal/mole more stabilized. This compares well with a gas-phase value of 17–18 kcal/mole determined from appearance potentials.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry