Trihydridosilyl-terminated polysilanes and methods of preparation
AssigneeGelest Technologies, Inc.
InventorsBarry C. Arkles, Youlin Pan, Gerald L. Larson
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Abstract
Novel trihydridosilyl-terminated polysilanes and methods for their synthesis, which are applicable to other polysilanes, are provided. The synthetic methods provide for facile preparation of products with minimal handling of pyrophoric intermediates and byproducts. The novel compounds contain at least three silicon-silicon bonds and at least one terminal silicon atom having three hydrogen substituents.
Claims20
A trihydridosilyl-terminated polysilane having formula (1), comprising at least four silicon atoms and at least one silicon terminus bonded to three hydrogen atoms,
- wherein R represents an organic substituent, R2 and R3 are not identical and are independently selected from the group consisting of an organic substituent, a hydrogen, and a substituted silyl group, R4, R5, and R6 are independently selected from the group consisting of an organic substituent, a substituted silicon atom and hydrogen, and m and n are each independently integers selected so that the total number of silicon atoms is at least 4.
A method for preparing a trihydridosilyl-terminated polysilane comprising:
- (a) preparing a non-pyrophoric aryl-substituted polysilane comprising at least four silicon atoms and an aryl-substituted silicon terminus;
- (b) halogenating the aryl-substituted polysilane to produce a halogenated polysilane;
- and
- (c) reducing the halogenated polysilane to yield a trihydridosilyl-terminated polysilane.
A method for preparing a trihydridosilyl-terminated oligodimethylsilane comprising:
- (a) coupling a halogen-terminated oligosilane with an alkali metal salt of a mono-, di-, or tri-aryl silane to form a coupling product;
- (b) halogenating the coupling product to form a halogenated intermediate;
- and
- (c) reducing the halogenated intermediate to form a trihydridosilyl-terminated oligodimethylsilane.
Dependencies are inferred from the claim text.