R 6R-C=C-R'+BH6→ CH;COOH R R C=C H cis- )B2H6 CH3CH2 CH3 CH3CH2C=C-CH 2)CH3COOH 4.4.4金属炔化物的生成 RC=CH+NaNH,Ig,Nm广RC三CNa+NH, HC=CH 2Ag(NH3)2*>AgC=CAg 鉴别端基炔烃 HC=CH 2Cu(NH3)2*>CuC=CCu