Patent US3757412A successfully refreshed from Google Patents.
US3757412A
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US
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Lanthanide isopropoxides and preparation of same
Assignee: United States Department of the Air Force
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Filing: 1971-10-20
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Granted: 1973-09-11
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Expires: 1991-10-20
Abstract
Abstract A process for preparing alkoxides of the lanthanide elements, such as lanthanum, cerium, praseodymium and neodymium, in high yields and at increased reaction rates, is provided by reacting a lanthanide element with isopropyl alcohol in the presence of a catalytic amount of mercuric iodide or a mixture of mercuric chloride and mercuric acetate.
Inventors
- 👤 K Mazdiyasni
- 👤 L Brown
- 👤 C Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/003
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
22 words
The process according to claim 1 in which said element is reacted with said isopropyl alcohol in stoichiometric amounts under reflux conditions.
Claim 2
Dependent Claim
41 words
The process according to claim 2 in which said isopropoxide is separated from the resulting reaction mixture; the separated isopropoxide is dissolved in isopropyl alcohol; and the resulting solution is cooled, thereby causing the isopropoxide to recrystallize as a purified product.
Claim 3
Dependent Claim
29 words
The process according to claim 2 in which said element is reacted with said isopropyl alcohol in stoichiometric amounts in an inert atmosphere at a temperature of about 82*C.
Claim 4
Dependent Claim
51 words
As a new composition of matter, a compound having the formula M(OC3H7)x, wherein M is a rare earth metal selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, holmium, erbium, thulium, and lutetium, and x is a numeral equal to the valence of the metal M.
Claim 5
Dependent Claim
15 words
The composition of claim 5 wherein M is lanthanum and x is equal to 3.
Claim 6
Dependent Claim
15 words
The composition of claim 5 wherein M is cerium and x is equal to 3.
Claim 7
Dependent Claim
15 words
The composition of claim 5 wherein M is praseodymium and x is equal to 3.
Claim 8
Dependent Claim
15 words
The composition of claim 5 wherein M is neodymium and x is equal to 3.
Claim 9
Dependent Claim
44 words
A process for preparing an isopropoxide of an element selected from the group consisting of lanthanum, cerium, praseodymium and neodymium which comprises reacting said element with isopropyl alcohol in stoichiometric amounts under reflux conditions in the presence of a catalytic amount of mercuric iodide.
Claim 10
Dependent Claim
63 words
A process for preparing an isopropoxide of an element of the lanthanide series which comprises reacting said element with isopropyl alcohol in stoichiometric amounts under reflux conditions in the presence of a catalytic amount of a mixture of mercuric chloride and mercuric acetate, the weight ratio of mercuric chloride and mercuric acetate in the mixture being in the range of 1.0:1.1 to 1.1:1.0.
Claim 11
Dependent Claim
34 words
The process according to claim 10 in which the amount of mercuric iodide is in the range of 1 X 10 4 to 1 X 10 2 mol per gram atom of said element.
Claim 12
Dependent Claim
36 words
The process according to claim 11 in which the amount of each compound in the mixture is in the range of 1 X 10 4 to 1 X 10 2 mol per gram-atom of said element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |