443影响亲核取代反应的因素 /■ f a given alkyl halide and nucleophile eact rapidly by an sn2 mechanism but slowly by an SN 1 mechanism under a given set of conditions, then an SN4 pathway will be followed by most of the molecules a On the other hand, if they react rapidly by an SN1 mechanism, then the o reactants will follow an SN1 pathwayOrganic Chemistry Organic Chemistry Xiamen Xiamen University University 4.4.3 影响亲核取代反应的因素 影响亲核取代反应的因素 „ If a given alkyl halide and nucleophile react rapidly by an S N2 mechanism but slowly by an S N1 mechanism under a given set of conditions, then an S N2 pathway will be followed by most of the molecules. „ On the other hand, if they react rapidly by an S N1 mechanism, then the reactants will follow an S N1 pathway