自由基转移反应或称自由基取代反应,是指自由基从一中性分子中攫取一个原子(通常是H原子),生成一个新的自由基和一个新的稳定分子的反应: X.+R—H→H—X+R.在机理上,这一基元过程称为均裂型双分子取代,即S_H2反应。本报告准备就控制这类反应的几种因素进行探讨。表1中所列的是各种不同的原子或自由基从烷烃中攫取氢原子的相对选择性。自由基与烷烃反应,攫取伯碳、仲碳或叔碳原子上的H Free radical transfer reaction or free radical substitution reaction refers to the radical from a neutral molecule to grab an atom (usually H atom), to generate a new radical and a new stable molecule reaction: X. + R -H → H-X + R. Mechanistically, this elementary process is called a homobifunctional bimolecular substitution, ie S_H2 reaction. This report is prepared to examine several factors that control this type of response. Listed in Table 1 are the relative selectivities of various atoms or radicals to grab hydrogen atoms from alkanes. Free radicals react with alkanes to grab H on primary, secondary, or tertiary carbon atoms