SYNTHESIS, SOLUTION BEHAVIOR AND MOLECULAR-STRUCTURE OF 16-ELECTRON )-CH2CH=CH2)]-1-N-(SIGMA-CH2CH=CH2)-2,1-RHCB10H10, THE FIRST ETA(2)-OLEFINIC MONOCARBON METALLACARBORANE

The first eta(2)-olefinic monocarbon metallacarborane [mu-(eta(2)-CH2C H=CH2)]-1-N-(sigma-CH2CH=CH2)-2,1- RhCB10H10 has been prepared by the reaction of the dimeric anion {[Ph3PRhB10H10CNH2](2)-mu-H}(-)[PPN](+) with allyl bromide and characterized by a combination of spectroscopic methods and a single-crystal X-ray diffraction study. The variable te mperature H-1 and C-13 NMR studies revealed the fluxional behavior of the eta(2)-olefinic complex in CD2Cl2 solution which is associated wit h the allyl side-chain exchange process. (C) 1998 Elsevier Science S.A . All rights reserved.