Treatment of terminal acetylenes with butyllithium, followed by an addition of gallium trichloride, afforded the corresponding alkynylgallium reagents. The reaction of the resulting alkynylgallium with α-halo carbonyl compounds in the presence of triethylborane as a radical initiator provided β,γ-acetylenic carbonyl compounds in good yields.
用丁基
锂处理末端
乙炔,然后加入三
氯化镓,得到相应的炔基
镓试剂。在作为自由基
引发剂的三乙基
硼烷存在下,所得炔基
镓与α-卤代羰基化合物的反应以良好的产率提供了β,γ-炔羰基化合物。