The homo-coupling of 1-alkenyl halides was examined in the presence of NiBr2(PPh3)2, PPh3, and excess zinc. The reactions proceed under very mild conditions to give high yields of conjugated dienes. The addition of KI or thiourea was unnecessary for a successful reaction, in contrast with systems without an external phosphine ligand.
1-烯基卤的同偶联反应在 NiBr2(PPh3)2、PPh3 和过量
锌存在下得以研究。这些反应在非常温和的条件下进行,生成高产率的共轭二烯。与没有外部
膦配体的体系相反,无需加入 KI 或
硫脲即可成功进行反应。