Journal
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
Volume -, Issue 6, Pages 841-844Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/a906915a
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The novel dilithium salt of 1,2-bis((BPSI)(2))ethane (BPSI = 3-butyl-2-phenyl-1-silaindenyl) 4 was prepared from the reaction of 2 with 1,2-bis(chloro-BPSI) ethane 3 and characterized by NMR spectroscopy and by X-ray crystallography. It is demonstrated that dianions of silicon not only can perform stepwise reactions but also that, when a quenching reagent possesses two remote electrophilic centers, they can be attacked separately and maintain single charges on the silicon centers. The two lithium ions in 4 are eta(1)-coordinated to two remote silyl anions. NMR and X-ray data are consistent with a low degree of pi-electron delocalization in the C4Si ring.
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