titanocene chloride complexes with the Lewis acids EtAlCl2 or Me2AlCl resulted in intramolecular insertion of a tethered alkyne into the TiC bond. Regioselective alkyne insertion produced exocyclic trisubstituted alkene products resulting from four-, five-, and six-membered ring formation. In the case of cyclohexane formation, the alkyne was found to insert with syn stereoselectivity.
                                    用
路易斯酸EtAlCl 2或Me 2 AlCl处理烷基二茂
钛氯化物络合物会导致将束缚的
炔烃分子内插入TiC键中。区域选择性
炔烃插入产生了由四元,五元和六元环形成的环外三取代烯烃产物。在形成
环己烷的情况下,发现炔以顺式立体选择性插入。