US4507245A
Expired / Lapsed
US
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Process for the production of a rare earth metal alkoxide
Assignee: Hokko Chemical Industry Co Ltd
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Filing: 1983-06-29
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Granted: 1985-03-26
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Expires: 2003-06-29
Abstract
Abstract A new improved process of producing a rare earth metal alkoxide is now provided, which comprises reacting a rare earth metal carboxylate with an alkali metal alkoxide in an inert organic solvent under anhydrous conditions, and which can be conducted in a facile way and give the desired rare earth metal alkoxide of a high purity in a high yield.
Inventors
- 👤 Yoshiharu Ozaki
- 👤 Kimiyoshi Kaneko
- 👤 Senshu Mitachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:44
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/003; C07C; C07C29/00; C07C29/68; C07C29/685
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A process for the production of a rare earth metal alkoxide of the general formula M(OR).sub.3 (I) wherein M denotes a rare earth metal atom and R denotes an alkyl group, which comprises reacting a rare earth metal carboxylate represented by the general formula M.sub.n X.sub.3 (II) wherein M is as defined above, X denotes the residue of a carboxylic acid and n is an integer of 1 or 2, provided that n is 1 when X denotes the residue of a mono-carboxylic acid; and n is 2 when X denotes the residue of a di-carboxylic acid, with an alkali metal alkoxide represented by the general formula ROM' (III) wherein R is an alkyl group as defined above and M' denotes an alkali metal, in an inert organic solvent or liquid under the anhydrous conditions.
Claim 2
Dependent Claim
135 words
A process for the production of a rare earth metal alkoxide of the general formula M(OR).sub.3 (I) wherein M denotes a rare earth metal atom and R denotes an alkyl group, which comprises reacting a rare earth metal carboxylate represented by the general formula M.sub.n X.sub.3 (II) wherein M is as defined above, X denotes the residue of a carboxylic acid and n is an integer of 1 or 2, provided that n is 1 when X denotes the residue of a mono-carboxylic acid; and n is 2 when X denotes the residue of a di-carboxylic acid, with an alkali metal alkoxide represented by the general formula ROM' (III) wherein R is an alkyl group as defined above and M' denotes an alkali metal, in an inert organic solvent or liquid under the anhydrous conditions.
Claim 3
Dependent Claim
50 words
A process as claimed in claim 1 in which the rare earth metal carboxylate used is of the formula M(OCOR.sup.a).sub.3 wherein M denotes a rare earth metal and R a denotes a hydrogen atom or an alkyl group of 1 to 10 carbon atoms or an optionally substituted aryl group.
Claim 4
Dependent Claim
46 words
A process as claimed in claim 1 in which the rare earth metal carboxylate used is of the formula ##STR10## wherein M denotes a rare earth metal and R b denotes a chemical linkage bond or an alkylene group of 1-4 carbon atoms or phenyl group.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1 in which the rare earth metal carboxylate used is selected from the formate, acetate, propionate, benzoate and oxalate of the rare earth metal.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 1 in which the inert organic solvent used as the reaction medium is selected from alkanols of 1 to 10 carbon atoms.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 1 in which the inert organic solvent as the reaction medium is selected from benzene, toluene and xylene as aromatic hydrocarbons.
Claim 8
Dependent Claim
34 words
A process as claimed in claim 1 in which the inert organic solvent as the reaction medium is a mixture of benzene, toluene or xylene with an alkanol of 1 to 10 carbon atoms.
Claim 9
Dependent Claim
37 words
A process as claimed in claim 1 in which the reaction is conducted for a time of 1 to 3 hours at a temperature of ranging from ambient temperature to the refluxing temperature of the reaction medium.
Claim 10
Dependent Claim
53 words
A process as claimed in claim 1 in which the alkali metal alkoxide is such one that has been produced in situ in the solution of the rare earth metal carboxylate in an alkanol by reacting a metallic alkali metal with the solvent alkanol of said solution of the rare earth metal carboxylate.
Claim 11
Dependent Claim
64 words
A process as claimed in claim 1 in which the reaction mixture after completion of the reaction is concentrated to dryness, the solid residue is then re-dissolved in a volume of benzene, toluene or xylene, the solution so obtained is filtered to remove the insoluble solids therefrom and to afford a clear solution of the rare earth metal alkoxide in benzene, toluene or xylene.
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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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |