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1. (WO2008051328) COMPOSITION COMPRENANT DU NÉOPENTASILANE ET PROCÉDÉ DE PRÉPARATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

That which is claimed is:

1. A composition comprising:
at least 93% (w/w) of neopentasilane;
not greater than 5% (w/w) of other silanes; and
not greater than 2% (w/w) of hydrocarbons.

2. The composition according to claim 1, wherein the composition comprises at least 97% (w/w) by neopentasilane.

3. The composition according to claim 1, wherein the composition comprises not greater than 3% (w/w) by other silanes.

4. The composition according to claim 1, wherein the composition comprises not greater than 1% (w/w) by hydrocarbons.

5. A method of preparing a composition comprising neopentasilane, the method comprising:
(i) treating a hexahalodisilane having the formula X3SiSiX3? wherein X is -Cl or -Br, with a tertiary amine catalyst to produce a first mixture comprising a tetrakis(trihalosilyl)-silane and a silicon tetrahalide;
(ii) separating the tetrakis(trihalosilyl)silane and the silicon tetrahalide;
(iii) treating the separated tetrakis(trihalosilyl)silane with diisobutylaluminum hydride to produce a second mixture comprising neopentasilane; and
(iv) distilling the second mixture to remove the neopentasilane.

6. The method according to claim 5, wherein the hexahalodisilane is hexachlorodisilane.

7. The method according to claim 5, wherein the tertiary amine catalyst is 1 ,4-diazabicyclo[2.2.2]octane.

8. The method according to claim 5, wherein the concentration of the tertiary amine catalyst is from 0.01 to 1% (w/w), based on the weight of the hexahalodisilane.

9. The method according to claim 5, wherein step (iii) and step (iv) are carried out in sequential order.

10. The method according to claim 5, wherein step (iii) and step (iv) are carried out simultaneously.

11. The method of claim 5, wherein the mole ratio of the diisobutylaluminum hydride to the tetrakis(trihalosilyl)silane is from 12 to 14.