S2反应的影响因素 ●1. Substrate(底物)-- Steric Effects H3C /HIllC--Br C-- BI Cpc-Br( Iacuc—Br H H H3C ●反应活性: methy>10>20>30SN2反应的影响因素 1. Substrate(底物) ---- Steric Effects 反应活性: methyl > 10 > 20 > 30 H C Br H H H3 C C Br H H H3 C C Br H3 C H H3 C C Br H3 C H3 C