Abstract: | (C5H2tBu3-1,2,4)2Pb] ( 1 ), (C5HiPr4)2Pb] ( 2 ), and (C5iPr5)2Pb] ( 3 ) have been obtained from PbCl2 and Li(C5H2tBu3-1,2,4), Na(C5HiPr4) and Na(C5iPr5), respectively. 3 exists as a 1 : 1 mixture of meso- 3 and rac- 3 which interconvert at elevated temperature via one-at-a-time rotation of isopropyl groups with ΔG# = 73.0 ± 1.5/73.7 ± 1.5 kJ/mol at 348 K. 3 is slightly bent in the solid state with an angle of 170(1)° between the ring normals. |