Synthesis of 1,2-bis[(diorgano)phosphino]ethanes via Michaelis–Arbuzov type rearrangements
作者:Lawrence C Baldwin、Mark J Fink
DOI:10.1016/s0022-328x(01)01431-0
日期:2002.3
the bisphosphinites R2POCH2CH2OPR2 (R=Ph, iPr and Cy) at 190–260 °C for 24 h gave the bisphosphine oxides, R2P(O)CH2CH2(O)PR2 in 9% (Ph), 90% (iPr) and 93% (Cy) yields. A DSC study of the thermal rearrangement of Cy2POCH2CH2OPCy2 to Cy2P(O)CH2CH2(O)PCy2 yielded an enthalpy of isomerization of −40.4±0.6 kcal mol−1. Reduction of the bisphosphine oxides, R2P(O)CH2CH2(O)PR2 (R=Ph, iPr and Cy) with trichlorosilane
研究了三步合成二(二有机膦基)乙烷R 2 PCH 2 CH 2 PR 2的方法,其中R = Et,Ph,i Pr,Cy和t Bu。第一步,在室温下于THF溶液中,在三乙胺存在下,使二有机氯膦与乙二醇反应。对于R = Ph,i Pr和Cy,以高收率获得双亚膦酸酯R 2 POCH 2 CH 2 OPR 2。对于R = Et,无法分离出次亚膦酸酯,但可能与80%的四乙基二膦醚Et 2 PPEt 2形成混合物,作为次要组成部分。二反应吨-butylchlorophosphine与乙二醇发生在温度大于130℃,使二-吨-丁基氧化膦,吨卜2 PH(O),作为唯一的含磷产物。双亚膦酸酯R 2 POCH 2 CH 2 OPR 2(R = Ph,i Pr和Cy)在190–260°C下热解24 h,得到双膦氧化物R 2 P(O)CH 2 CH 2(O)PR 2在9%(PH),90%(我PR)和93%(CY)的产率。DSC研究Cy