Thermal cyclooligomerization of tBuCEP is nonselective yielding a mixture containing 2a in low yield (-10%). Chemoselective synthesis of 2a and 2b was subsequently achieved using the tricyclic zirconium complex 3 by reaction with hexachloroethane (Figure l), providing gram quantitites (3a, b-2a, b) for further studies.'S2 Photoelectron spectroscopy, 3 ab initio~ alculations,~ and NMR spectroscopy support the notion that nP-u PC delocalization ...
[White, Emil H.; DePinto, Jeffrey T.; Polito, Albert J.; Bauer, Ines; Roswell, David F. Journal of the American Chemical Society, 1988 , vol. 110, p. 3708 - 3709]
[White, Emil H.; DePinto, Jeffrey T.; Polito, Albert J.; Bauer, Ines; Roswell, David F. Journal of the American Chemical Society, 1988 , vol. 110, p. 3708 - 3709]