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Scandium-Mediated Formation of a Bis(tetrahydropentalene).
Title Scandium-Mediated Formation of a Bis(tetrahydropentalene).
Authors Rausch, J.; Liebing, P.; Lorenz, V.; Hilfert, L.; Busse, S.; Maichle-Mössmer, C.; Edelmann, F.T.
Journal Angew Chem Int Ed Engl
DOI 10.1002/anie.201703362
Abstract

The reactivity of Li[Sc(COT'')2 ] (1; COT''=1,4-bis(trimethylsilyl)cyclooctatetraenyl) towards CoCl2 is considerably different from that of related lanthanide triple-decker sandwich complexes. In addition to the expected triple-decker complex Sc2 (COT'')3 (2), the complex Sc2 {μ-BTHP}(COT'')2 (3) is formed, which comprises the novel BTHP(2-) ligand (BTHP(2-) =bis(3,5-bis(trimethylsilyl)-1,3a,6,6a-tetrahydropentalene-1-yl)diide or bis(2,7-bis(trimethylsilyl)bicyclo[3.3.0]octa-2,7-dien-4-yl)diide, C16 H10 (SiMe3 )4(2-) ). The formation of 3 is likely facilitated by the fact that scandium prefers η(8) ,η(3)  coordination rather than highly symmetric η(8) ,η(8)  coordination, and the η(3) -coordinated COT'' ligand in 1 is activated owing to a loss of aromaticity. Acid hydrolysis of 3 leads to air-stable H2 BTHP (4).