Tetramesityldisilene and trans-1,2-di-t-butyl-1,2-dimesityldisilene (3) react with various 1-alkynes to give air-stable disilacyclobutenes. The cycloaddition of 3 to alkynes produces equal amounts of both stereoisomers, consistent with a stepwise mechanism.
                                    四均三甲
硅烷和反式-1,2-二叔丁基-1,2-二三甲
硅烷(3)与各种1-炔反应,得到空气稳定的二
硅杂
环丁烯。 3与
炔烃的环加成产生等量的两种立体异构体,与逐步机制一致。