Abstract
Structurally characterized lithium pentadienyls are very rare. We report the molecular structures of two lithium pentadienyls, [(pmdeta)Li{1-(R3Si)C5H6}] (3) and [(pmdeta)Li{1,5-(R3Si)2C5H5}] (4) (R3Si = Me2(NMe2)Si, pmdeta = N,N,N′,N″,N″-pentamethyldiethylenetriamine). In 3, the pentadienyl carbons adopt an η3 coordination mode, whereas in 4 η1 coordination is found. The origins of the different coordination modes are discussed.
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