The aminoiminoborane Me3Si(But)NB[graphic omitted]NBut reacts with the alkylidene complex [(η-C5H5)Cl2TaCHBut] at –50 °C to give a (2 + 2) cycloadduct containing a [graphic omitted] ring; on warming to 0 °C cleavage occurs, affording the metathesis products Me3Si(But)NBCHBut and [(η-C5H5)Cl2TaNBut].
所述aminoiminoborane我3的Si(BU吨)N B [图形省略] NBU吨与亚烷基络合物[(η-C发生反应5 ħ 5)
氯2的Ta
CHBu吨在-50℃],得到(2 + 2)含有[图形省略的]环的环加合物;上温热至0℃,裂解发生,得到的复分解产物我3的Si(BU吨)N乙
CHBu吨和[(η-C 5 H ^ 5)
氯2的Ta NBU吨]。