Zn RCHXCH2X →RCH=CH CH:CHCHCH3 I CHCH=CHCH BrBr 5)炔烃的还原 H2,Pd/CaCo (Lindlar's catalyst) R quinoline C=C (syn addition) H R-C=C-R H Li or Na R 一 C=0 lig.NH (anti addition)