Formation and molecular structure of (η 5 -cyclopentadienyl)-(η 4 -cyclobuta-[ l ]phenanthrene)rhodium: a cyclobutadiene–metal complex derived from the intramolecular cyclodimerization of an acyclic diacetylene
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Interactions of the diacetylene 2,2′-bis(phenylethynyl)biphenyl with the metal carbonyls [(η5-C5H5)-Co(CO) 2], [(η5-C5H5)Rh(CO) 2], and [Fe(CO)5] proceed via intramolecular cyclodimerization to form the respective η4-1,2- diphenylcyclobuta[l]phenanthrene complexes in each case; for the rhodium analogue, a cyclobutadiene-type structure containing a unique trapezoidal η4-C4-ring has been unequivocally established by means of X-ray diffraction techniques.
author list (cited authors)
Rausch, M. D., Gardner, S. A., Tokas, E. F., Bernal, I., Reisner, G. M., & Clearfield, A.