They also asserted that a positively charged halogen atom is isoelectronic with oxygen and that carbon and bromine have comparable ionization potentials. For certain aryl substituted alkenes, the anti stereospecificity is diminished or lost, as a result of weakened or absent halonium character in the cationic intermediate.
The authors asserted that a positively charged halogen atom is equivalent in electron configuration to oxygen, and that carbon and bromine have similar ionization energies. In certain aryl substituted alkenes, the anti stereospecificity is reduced or lost because of weakened or absent halonium character in the cationic intermediate.