Basizit�t von Ketonen

Selective Formation of Internal Olefinic Trimer of α-Methylstyrenes with HI Gas and Ketones

“…The acidity of the conjugated acid of ketones was reviewed by Freiberg. 18 The p K BH + values for methyl p -tolyl ketone, acetophenone, benzophenone, p -methoxyphenyl methyl ketone, p -chlorophenyl methyl ketone, and acetone 19 were −4.02, −4.32, −4.95, −3.31, −4.85, and −2.85, respectively, even though p K BH + value was determined by fitting into the Bunnett–Olsen equation 20 in aqueous sulfuric acid. We could not find any relation between p K BH + value and the selectivity in our investigation.…”

“…From those results, one possibility that arose as a reason for occurring selectively was the difference of the basicity of the additive. The acidity of the conjugated acid of ketones was reviewed by Freiberg . The p K BH + values for methyl p -tolyl ketone, acetophenone, benzophenone, p -methoxyphenyl methyl ketone, p -chlorophenyl methyl ketone, and acetone were −4.02, −4.32, −4.95, −3.31, −4.85, and −2.85, respectively, even though p K BH + value was determined by fitting into the Bunnett–Olsen equation in aqueous sulfuric acid.…”