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US4101568A
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US
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Production of dialkylaluminum hydrides
Assignee: Texas Alkyls Inc
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Filing: 1976-02-27
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Granted: 1978-07-18
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Expires: 1996-02-27
Abstract
Abstract Dialkylaluminum hydrides are produced by subjecting a mixed aluminum alkyl having the formula R.sub.2 AlR' to pyrolysis. R is methyl, ethyl, n-alkyl or an alkyl group which has no hydrogen atoms on the carbon atom β to the aluminum. R' is an α- or β branched alkyl group having the formula ##STR1## in which one R" is hydrogen and the other is alkyl and R'" is alkyl. The mixed aluminum alkyl R 2 AlR' can be obtained either by reaction of two aluminum alkyls: 2R.sub.3 Al + R'.sub.3 Al → 3R.sub.2 AlR' or by reaction of a trialkylaluminum with a dialkylaluminum hydride: 2R.sub.3 Al + R'.sub.2 AlH → 2R.sub.2 AlR' + R.sub.2 AlH, in which case one third of the desired hydride is synthesized.
Inventors
- 👤 Dennis B. Malpass
- 👤 Spencer C. Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:03
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/065
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
96 words
A non-catalytic process for the production of dialkylaluminum hydrides having the formula R 2 AlH in which R is an n-alkyl group having from 1 to 15 carbon atoms or a tri-substituted alkyl group having the formula ##STR7## in which R a is an alkyl group, comprising heating a compound having the formula R 2 AlR' in which R' is an α- or β- mono-substituted alkyl group of the type ##STR8## in which one R" is hydrogen and the other is alkyl and R"' is alkyl, at a temperature between about 50° and about 220° C.
Claim 2
Dependent Claim
96 words
A non-catalytic process for the production of dialkylaluminum hydrides having the formula R 2 AlH in which R is an n-alkyl group having from 1 to 15 carbon atoms or a tri-substituted alkyl group having the formula ##STR7## in which R a is an alkyl group, comprising heating a compound having the formula R 2 AlR' in which R' is an α- or β- mono-substituted alkyl group of the type ##STR8## in which one R" is hydrogen and the other is alkyl and R"' is alkyl, at a temperature between about 50° and about 220° C.
Claim 3
Dependent Claim
47 words
A process according to claim 1 in which R 2 AlR' is formed by mixing a compound having the formula R 3 Al with a compound having the formula R' 3 Al in a mole ratio of R 3 Al : R' 3 Al of about 2:1.
Claim 4
Dependent Claim
47 words
A process according to claim 1 in which R 2 AlR' is formed by mixing a compound having the formula R 3 Al with a compound having the formula R' 2 AlH in a mole ratio of R 3 Al : R' 2 AlH of about 2:1.
Claim 5
Dependent Claim
11 words
A process according to claim 1 in which R is methyl.
Claim 6
Dependent Claim
11 words
A process according to claim 1 in which R is ethyl.
Claim 7
Dependent Claim
20 words
A process according to claim 1 in which R is an n-alkyl group having from 3 to 15 carbon atoms.
Claim 8
Dependent Claim
11 words
A process according to claim 6 in which R is n-butyl.
Claim 9
Dependent Claim
11 words
A process according to claim 6 in which R is n-octyl.
Claim 10
Dependent Claim
18 words
A process according to claim 1 in which R is a tri-substituted alkyl group having the formula ##STR9##
Claim 11
Dependent Claim
11 words
A process according to claim 9 in which R is neopentyl.
Claim 12
Dependent Claim
11 words
A process according to claim 1 in which R' is isobutyl.
Claim 13
Dependent Claim
16 words
A process according to claim 1 in which olefinic product is continuously removed during the process.
Claim 14
Dependent Claim
22 words
A process according to claim 12 in which the olefinic product is removed by passing an inert gas through the reaction mixture.
Claim 15
Dependent Claim
18 words
A process according to claim 1 in which the temperature is between about 80° and about 190° C.
Claim 16
Dependent Claim
11 words
A process according to claim 1 carried out at sub-atmospheric pressure.
Claim 17
Dependent Claim
11 words
A process according to claim 1 carried out at super-atmospheric pressure.
Claim 18
Dependent Claim
18 words
A process according to claim 16 in which the pressure is between about 1 and about 15 atmospheres.
Claim 19
Dependent Claim
17 words
A process according to claim 1 further comprising purifying the dialkylaluminum hydride by distillation under reduced pressure.
Claim 20
Dependent Claim
16 words
A process according to claim 1 in which R contains from 1 to 5 carbon atoms.
References Cited (Backward Citations)
US3015669A
Cited
US2843474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |