作为一种活性中间体,自由基的稳定性可从热力学和动力学两个方面去考察。动力学稳定性主要看生成自由基的反应速度的相对大小。而自由基的热力学稳定性是用均裂键能来度量的。键均裂解离能提供了有关键强度的重要信息,是量度自由基稳定性的一种基本标度。一般讲,键能越小,则生成的自由基就 As an active intermediate, the stability of free radicals can be investigated from two aspects of thermodynamics and kinetics. Kinetic stability mainly depends on the relative size of the reaction rate of free radicals. The thermodynamic stability of free radicals can be measured by means of homoharringtonic bonds. The cleavage of the bond provides important information on the strength of the bond and is a basic measure of the stability of the free radical. In general, the smaller the bond energy, the free radicals generated