Synthesis, Structure, and Reactivity of Zirconacyclopentene Incorporating a Carboranyl Unit
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Abstract
A zirconacyclopentene incorporating a carboranyl unit 1,2-[Cp2ZrC(Et)=C(Et)]-1,2-C2B10H10 (1), an analogue of well-known zirconacyclopentadienes, was prepared and fully characterized from the reaction of Cp2Zr(mu-Cl)(mu-C2B10H10)Li(OEt2)2 with EtC OCEt in reflux toluene. Complex 1 resembles zirconacyclopentadienes in some reactions, and on the other hand, it has unique properties of its own. Many carborane derivatives with interesting structural features such as 1-[CI(Et)=C(Et)]-1,2-C2B10H11, naphthalocarborane, and 1,2-[C(Et)=C(Et)]-1,2-C2B10H10 can be conveniently prepared from 1. This work shows that 1 provides a very valuable entry point to the synthesis of various kinds of carborane derivatives that can not be prepared by conventional methods.
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