二、以醇为原料 催化剂 ROH+HX 士 RX +H2O CH3CH2CHOH+SOC 2毗院CH,CHCHCI+SO2↑+HCI1 CH3 CH3 3CH3CH2CH2OH PBr3-3CH3CH2CH2Br H3PO3 (或P+Br2)二、以醇为原料 ROH + HX RX + H2O 催化剂 CH3CH2CHOH + + + HCl CH3 CH3CH2CHCl CH3 SOC SO2 l 2 吡啶 ↑ ↑ + PBr 3 CH + 3 3CH2CH2OH 3CH3CH2CH2Br H3 PO3 或 P + Br ( 2 )