Patent US4879397A successfully refreshed from Google Patents.
US4879397A
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Novel gallium arsenide precursor and low temperature method of preparing gallium arsenide therefrom
Assignee: Cornell Research Foundation Inc
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Filing: 1987-11-03
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Granted: 1989-11-07
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Expires: 2007-11-03
Abstract
Abstract A novel gallium arsenide precursor has the formula R 2 GaAs(SiR') 2 wherein R is selected from the group consisting of alkyl substituted cycloaliphatic group and alkyl substituted aromatic group and R' is alkyl. Preferably, R is pentamethylclopentadienyl and R' is methyl. The precursor is reacted with an alcohol, preferably ethanol or t-butanol at a temperature ranging from -20° C. to 60° C., preferably at room temperature, under water free conditions to form solid gallium arsenide and by-products which are liquid under the reaction conditions.
Inventors
- 👤 Klaus H. Theopold
- 👤 Erin K. Byrne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:14
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/007; C07; C07F; C07F9/00; C07F9/66; C07F9/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
Arsinogallane compound having the formula R 2 Ga-As(SiR' 3 ) 2 wherein R is selected from the group consisting of a cycloaliphatic group, an alkyl substituted cycloaliphatic group and an alkyl substituted aromatic group and R' is alkyl.
Claim 2
Dependent Claim
38 words
Arsinogallane compound having the formula R 2 Ga-As(SiR' 3 ) 2 wherein R is selected from the group consisting of a cycloaliphatic group, an alkyl substituted cycloaliphatic group and an alkyl substituted aromatic group and R' is alkyl.
Claim 3
Dependent Claim
28 words
Arsinogallane as recited in claim 1 wherein the alkyl substituent of R contains from 1 to 5 carbon atoms and R' contains from 1 to 5 carbon atoms.
Claim 4
Dependent Claim
23 words
Arsinogallane as recited in claim 2 wherein R is selected from the group consisting of pentamethylcyclopentadienyl, mesityl and 1-nobornyl and R' is methyl.
Claim 5
Dependent Claim
10 words
Arsinogallane as recited in claim 3 wherein R is pentamethylcyclopentadienyl.
Claim 6
Dependent Claim
107 words
Process for preparing an arsinogallane compound having the formula R 2 Ga-As(SiR' 3 ) 2 wherein R is pentamethylcyclopentadienyl and R' is methyl, said process comprising reacting LiAs(SiMe 3 ) 2 where Me is methyl and (R 2 GaCl) 2 where R is pentamethylcyclopentadienyl in the absence of water in stoichiometric amounts at room temperature in aliphatic hydrocarbon solvent to obtain substantial completeness of reaction to produce a solution where a reaction product is dissolved in said solvent and a by-product precipitate, separating the solution from the precipitate, removing solvent from the solution to obtain a solid, and recrystallizing said solid thereby to obtain said arsinogallane compound.
Claim 7
Dependent Claim
107 words
Process for preparing an arsinogallane compound having the formula R 2 Ga-As(SiR' 3 ) 2 wherein R is pentamethylcyclopentadienyl and R' is methyl, said process comprising reacting LiAs(SiMe 3 ) 2 where Me is methyl and (R 2 GaCl) 2 where R is pentamethylcyclopentadienyl in the absence of water in stoichiometric amounts at room temperature in aliphatic hydrocarbon solvent to obtain substantial completeness of reaction to produce a solution where a reaction product is dissolved in said solvent and a by-product precipitate, separating the solution from the precipitate, removing solvent from the solution to obtain a solid, and recrystallizing said solid thereby to obtain said arsinogallane compound.
Claim 8
Dependent Claim
15 words
Process as recited in claim 5 where a single recrystallization is carried out, from pentane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |