The monohydroboration of representative conjugated enynes - but-1-en-3-yne (1), 2-methylbut-1-en-3-yne (2), pent-3-en-1-yne (3), hex-1-en-3-yne (4), 2-methyl-4-phenylbut-1-en-3-yne (5), 4-methyl-1-phenylpent-3-en-1-yne (6) and 1-ethynylcyclohex-1-ene (7), with catecholborane in the presence of the nickel(II) chloride complex with 1,2-bis(diphenylphosphino)ethane gave the corresponding 1,3-dien-1-yl organoboranes in 54-87% yield. High regioselectivity of the addition leading to the boron atom at the 4-position of the 1-en-3-yne system was observed for 1, 2, 3, 6 and 7.
代表性共轭烯烃的单氢硼化反应 - 丁-1-烯-3-炔(1),2-甲基丁-1-烯-3-炔(2),戊-3-烯-1-炔(3),己-1-烯-3-炔(4),2-甲基-4-苯基丁-1-烯-3-炔(5),4-甲基-1-苯基戊-3-烯-1-炔(6)和1-乙炔基环己-1-烯(7),在存在1,2-双(二苯基膦基)乙烷的镍(II)氯化物配合物的情况下,与邻苯二酚硼烷反应,产率为54-87%。观察到对于1、2、3、6和7,加成反应导致硼原子位于1-烯-3-炔系统的4位的高区域选择性。