Hi Ungsik, I am interested in this as well. Could you send me the references you got? There is a AMBER-set by Hoeweler and Erker: U. Hoeweler, R. Mohr, M. Knickmeier, G. Erker, Organometallics 1994, 13, 2380-2390. John email: lohrenz "at@at" zinc.chem.ucalgary.ca ##########################################################################