PREPARATION AND STRUCTURE OF (ETA(5)-CYCLOPENTADIENYL) (ETA(4)-TETRAPHENYLCYCLOBUTADIENE)COBALT COORDINATED BY THREE CR(CO)(3) UNITS AT THE PHENYL RINGS

摘要

The reaction of (eta(5)-cyclopentadienyl) (eta(4)-tetraphenylcyclobutadiene)cobalt (1) with excess Cr(CO)(6) led to five identified heterometallic compounds. They are compounds 2, 3 (3' and 3''), 4 and 5 with one, two, three and four phenyl ring(s) being complexed with Cr(CO)(3) fragment(s), respectively. The X-ray crystal structure of 4 has been determined and can be regarded as an intermediate in the structural change from 3' to 5. It shows that one Cr(CO)(3) fragment is on the same side of the CpCo fragment, whereas the other two Cr(CO)(3) fragments are opposite to the CpCo fragment. [References: 14]