Bis(trifluoromethyl)phosphinous Acid (CF3)2P-O-H: An Example of a Thermally Stable Phosphinous Acid—Synthesis, Gas-Phase Structure, and Rotational Isomers
作者:Berthold Hoge、Placido Garcia、Helge Willner、Heinz Oberhammer
DOI:10.1002/chem.200501066
日期:2006.4.24
The bis(trifluoromethyl)phosphinous acid, (CF3)2P-O-H, is the only known example of a thermally stable phosphinous acid. Although this compound has been known since 1960, little is known about the chemistry of this extraordinary compound; this might be due to the tedious, and in some part risky, synthesis that was originally published. An improved, simple, and safe synthesis that is based on the treatment
双(三氟甲基)次膦酸(CF 3)2 P-OH是热稳定的次膦酸的唯一已知实例。尽管此化合物自1960年以来就为人所知,但对这种非常规化合物的化学知之甚少。这可能是由于最初发表的乏味且有一定风险的综合文章所致。提出了一种改进的,简单且安全的合成方法,该方法基于使用至少三当量的对甲苯磺酸处理易获得的(CF3)2PNEt2。该反应导致完全转化为次膦酸,将其以接近90%的产率分离。该化合物存在于两个P-OH旋转异构体的平衡中,这一事实得到了量子化学计算的支持。在B3PW91 / 6-311G(3d,p)水平下计算的相对焓差为6.4 kJ mol(-1),与5.9 kJ mol(-1)的实验值非常吻合,该值由两种旋转异构体的nu(OH)谱带的温度依赖性确定。提出了两种旋转异构体的完整实验振动光谱,通过量子化学计算获得的预测振动光谱以及尝试对基质分离的(CF3)2POH进行光致异构化。通过气相的电子衍射