CYCLOPENTADIENYL RING METATHESIS WITH ORGANOCALCIUM AND ORGANOPOTASSIUM COMPOUNDS

Cyclopentadienyl ring metathesis occurs between [Ca(C(5)Me(5))(2)] and [Ln(C5H5)(3)] complexes in toluene to generate the mixed ring compoun ds [Ln(C(5)Me(5))(2)(C2H5)] (Ln = 1-La, 1-Nd). 1-Nd has been character ized with X-ray diffraction as a sterically crowded monomer. Only one ring is exchanged between [Ca(C(5)Me(5))(2)(thf)(x)] and [La(C5H5)(3)( thf)(x)] in toluene to yield [La(C(5)Me(5))(C5H5)(2)(thf)] (2) In reac tion with [M(C5H5)(2)] (M = Sn, Pb. Mn), [Ca(C(5)M(5))(2)(thf)(x)] yie lds the corresponding [M(C(5)Me(5))(2)] complexes. K[C(5)Me(5)] reacts with [La(C5H5)(3)(thf)], [Sn(C5H5)(2)] and [Pb(C5H5)(2)] in toluene t o yield the ring-exchanged products 2, [Sn(C(5)Me(5))(2)], and [Pb(C(5 )Me(5))(2)], respectively.