Tabela de pKa Aproximado dos Grupos Funcionais - Quimica Organica

Approximate pKa chart of the functional groups values to know 1 Protonated carbonyl pKa 7 Other important pKas 2 Protonated alcohol or ether pKa 2 to 3 H2 35 3 Carboxylic acid pKa 45 4 Ammonium ion pKa 910 5 Phenol pKa 10 6 Thiol pKa 10 7 Alcohol pKa 1618 8 Water pKa 157 9 Amide pKa 18 10 Alpha proton of ketonealdehyde pKa 20 11 Alpha proton of ester pKa 25 12 Terminal alkyne pKa 25 13 Amine pKa 3840 14 Aromatic Aryl 43 benzylic 41 15 Alkene vinyl 4550 allylic 43 16 Alkane pKa above 50 Examples 7 2 to 3 2 to 3 45 910 1618 10 10 18 20 25 3840 41 43 4550 above 50 benzylic aryl allylic vinyl