作者:Jian-xie Chen、Katsumasa Sakamoto、Akihiro Orita、Junzo Otera
DOI:10.1016/s0022-328x(98)00928-0
日期:1999.2
of ketene silyl acetal in sharp contrast to the inertness of normal alkyltin halides like Bu2SnCl2. The increased Lewis acidity of the pentafluorophenyltin halides was proved by 119Sn- and 13C-NMR spectra. On the other hand, the pentafluorophenyl group reduced the reactivities of tin towards both nucleophiles and electrophiles. 19F-NMR spectroscopy was invoked to elucidate this anomaly.
制备了多种五氟苯基锡化合物并检查了它们的化学性质。这些化合物有效地催化了乙烯酮甲硅烷基缩醛的Mukaiyama-aldol反应,这与常规烷基锡卤化物如Bu 2 SnCl 2的惰性形成了鲜明的对比。五氟苯基锡卤化物的路易斯酸度增加是通过119 Sn-和13 C-NMR光谱证明的。另一方面,五氟苯基降低了锡对亲核试剂和亲电试剂的反应性。调用19 F-NMR光谱来阐明该异常。