Supplementary Material Available: Listings of atomic coordinates for non-hydrogen atoms, bond distances and angles, thermal parameters, and hydrogen atom coordinates (7 pages); a listing of observed and calcdated structure factors (23 pages). Ordering information is given on any current masthead page. ... (10) Reviews: Huttner, G.; Everts, K. 1986,19, 406. Mathey, F. An- gew. Chem., Znt. Ed. Engl. 1987,26, 275. (11) Scherer, 0, J.; Konrad, R.; Guggolz, E.; ...