Stereospecific synthisis of 2,3-dihydro-2-metallaphenalenes, meso-[M(η-C5H5)2R2][M = Zr, Hf; R2=(CHSiME3)2C10H6], via an unstable dilithium reagent, [R2(Li(tmeda))2](tmeda = tetramethyl-ethylenediamine), which is coverted the complex [CHSiMe2C(SiMe3)C10H6][Li(tmeda)]2 containing a silicon heterocycle dicarbanion

Rocco I. Papasergio, Colin L. Raston

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