Xie Zuowei, Yan Chaoguo, Yang Qingchuan, Mak Thomas C W
Department of Chemistry, The Chinese University of Hong Kong, Shatin NT, Hong Kong (China), Fax: (+852) 26035057.
Angew Chem Int Ed Engl. 1999 Jun 14;38(12):1761-1763. doi: 10.1002/(SICI)1521-3773(19990614)38:12<1761::AID-ANIE1761>3.0.CO;2-B.
The tetranion ligand η -C B H has been observed for the first time in 1, which was obtained from the reaction of o-C B H with excess K metal followed by treatment with UCl . As shown in the picture (without K cations and coordinated THF molecules), 1 is a centrosymmetric dimer with a bent sandwich structure.