The reaction of BaO, SiO 2 , and an excess of ethylene glycol provides [Ba‐Si(OCH 2 CH 2 O) 3 ] · 3.25 HO(CH 2 ) 2 OH, the first amazingly stable hexaalkylsilicate, in 90% yield. This complex was characterized by X‐ray crystallography. The reactions with MgO and CaO give analogous compounds; with alkali metal oxides pentacoordinate silicates are formed.
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Hoppe et al. (1993) studied this question.
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