The palladium(II)/carbon monoxide-mediated biaryl formation from aryltellurium trihalides
作者:Hidetaka Takahashi、Kouichi Ohe、Sakae Uemura、Nobuyuki Sugita
DOI:10.1016/0022-328x(88)80378-4
日期:1988.8
4-MeOC6H4, 4-BuOC6H4, 4-PhOC6H4, 2-naphthyl; X = Cl, Br) with a palladium(II) salt in acetonitrile at 25°C affords, in good yields (29–78%), the corresponding biaryls (ArAr) either in the atmosphere or under 1 atm CO. The presence of CO accelerates this aromatic coupling significantly to produce some active palladium carbonyl species, the formation of which was confirmed by IR spectroscopy of Li2PdCl4 in
aryltellurium三卤化物(抽纱的治疗3:Ar为PH,4- BRC 6 ħ 4,4-MEC 6 ħ 4,4-MeOC 6 H ^ 4,4-BuOC 6 ħ 4,4-PhOC 6 ħ 4,2-萘基; X = Cl,Br)和钯(II)盐在25°C的乙腈溶液中,可在大气中或低于1个大气压的条件下,以良好的收率(29-78%)提供相应的联芳基(ArAr)。的CO大大加速了这种芳族偶联,从而产生了一些活性的羰基钯物种,其形成已通过Li 2 PdCl 4的红外光谱证实在乙腈溶液中于一氧化碳; (Pd = C = O)物种的ν(C = O)分别在2140和1908 cm -1处显示出强烈的尖锐吸收和较弱的尖锐吸收。反应后用碱处理对于产生联芳基是必不可少的。