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- W2166583499 abstract "The novel alkali metal zinc-alkoxide and the first -siloxide aggregates [(thf)M(MeZn)(OtBu)2]21a (M = Li), 1b (M = Na), [(thf)2K(MeZn)(OSiMe3)2]22 and [(tmeda)KZn(OSiMe3)3]23 are easily accessible from the reaction of Me2Zn with MOR (molar ratio 1 ∶ 1; M = Li, Na, K; R = tBu, SiMe3) in boiling thf and tmeda, respectively. While 1a, 1b and 2 possess distorted M2Zn2O4 heterocubane frameworks, compound 3 consists of a K2Zn2O6 core of a strongly distorted, face-fused double-heterocubane with two missing corners. In contrast, heating a mixture of Me2Zn and KOtBu in the molar ratio of 1 ∶ 1 in toluene affords the donor solvent-free K–Zn–O cluster [K(MeZn)3(OtBu)4] 4 which crystallizes as a polymer of strongly distorted [KZn3O4] heterocubanes via intermolecular agostic K⋯MeZn interactions. The formation of the clusters may be rationalized in terms of alkali metal ion- and donor solvent-dependent ligand exchange reactions of methyl(alkoxide)- and methyl(siloxide)-zincates as initial products. Some of the initial products have been detected by means of electro spray ionisation (ESI) mass spectrometry." @default.
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- W2166583499 date "2003-01-01" @default.
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- W2166583499 title "Facile synthesis and structural variation of novel heterobimetallic alkali metal–zinc-alkoxide and -siloxide clusters" @default.
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- W2166583499 doi "https://doi.org/10.1039/b302585c" @default.
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