Нуклеофильное замещение
H2SO4 ↔ H+ + HOSO3- HBr ↔ H+ + Br-
(CH3)2CHCH2 ─ OH + H+ → (CH3)2CHCH2─ O+─H ↔ (CH3)2CHCH2+ + H2O
H
H2SO4 активирует молекулу спирта
(CH3)2CHCH2+ + HOSO3- → (CH3)2CHCH2OSO3H
(CH3)2CHCH2 ─ Br + + HSO4- + H+ → H2SO4
Механизм побочных реакций
(CH3)2CHCH2 ─ OH + H+ → (CH3)2CHCH2─ O+─H
(CH3)2CHCH2+
H
(CH3)2C=CH2
(CH3)2CHCH2+
(CH3)2CHCH2─ O+ ─ CH2CH(CH3)2 
H
(CH3)2CHCH2─ O ─ CH2CH(CH3)2