Hofmann Elimination

R3N(CH3)+ + OH− → alkene + R3N + H2O

개요

The Hofmann elimination converts a quaternary ammonium salt to an alkene, amine, and water upon heating with base. Unlike E2 elimination, Hofmann elimination favors the less substituted alkene (anti-Zaitsev). This reaction was historically used to determine amine structures by exhaustive methylation and elimination.

참여 물질

역할 물질 계수 상태
생성물 Water H₂O 1 (l)

일상 속 예시

Hofmann elimination was crucial in determining the structures of complex alkaloids like morphine and quinine before modern spectroscopy.

산업적 중요성

알켄 합성에서 덜 치환된 이중 결합(호프만 생성물)을 선택적으로 얻는 방법입니다. 의약품 합성, 특히 4급 암모늄 화합물 분해 및 알킬아민 합성에 활용됩니다.

성질

유형
Organic
가역 반응
아니오
에너지
발열
ΔH
-40.0 kJ/mol
촉매
Ag₂O (for quaternary salt formation)

관련 반응

Epoxidation of Alkenes (mCPBA) Swern Oxidation Oxidation of Secondary Alcohol to Ketone E2 Elimination (Dehydrohalogenation) Claisen Condensation (Ethyl Acetate) Aldol Condensation of Acetaldehyde Kolbe Electrolysis Baeyer-Villiger Oxidation Beckmann Rearrangement (Cyclohexanone Oxime) Dehydration of Ethanol

Frequently Asked Questions

What is the equation for Hofmann Elimination?
The balanced equation is: R₃N(CH₃)⁺ + OH⁻ → alkene + R₃N + H₂O.
What type of reaction is Hofmann Elimination?
Hofmann Elimination is a organic reaction.
Is Hofmann Elimination exothermic or endothermic?
Hofmann Elimination is exothermic (releases energy). The enthalpy change (ΔH) is -40.0 kJ/mol.
What conditions are needed for Hofmann Elimination?
This reaction requires a catalyst (Ag₂O (for quaternary salt formation)).