Patent ID: 8512666
Filing Date: 2013-08-20
Classification: C01B

Abstract:
1. Process for the preparation of neopentasilanes of the general formula (1) said process comprising: (a) a reacting step in which silicon compounds of the general formula (2) where R is a member selected from the group consisting of Cl, Br and I, and x denotes a non-negative integer up to 5, are reacted in the presence of catalytically active compounds, (b) a first distilling step in which a tetrahalosilane which is formed in the reacting step is separated off from a beginning of the reacting step by distillation in a still, (c) an addition step in which a high boiler compound is added to a bottom of the still after an end of the reacting step, wherein the high boiler compound is liquid at room temperature and has a higher boiling point than the tetrahalosilane liberated by the first distilling step, (d) a second distilling step in which an additional amount of the tetrahalosilane is separated off by distillation in a presence of the high boiler compound, and (e) a cooling step in which the bottom part of the still is allowed to cool such that tetrahalosilane-free neopentasilane precipitate forms.