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US4147709A
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Zirconium halohydride preparation
Assignee: Monsanto Co
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Filing: 1977-05-02
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Granted: 1979-04-03
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Expires: 1997-05-02
Abstract
Abstract Zirconium halohydrides having the formula ##STR1## WHEREIN R is a π-cyclopentadienyl radical are prepared by reacting a dihalide having the formula ##STR2## WITH MOLECULAR HYDROGEN IN THE PRESENCE OF AN UNREACTED Group Ia metal in a solvent for the dihalide.
Inventors
- 👤 Gary J. Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:36
CPC Classifications
C; C07; C07F; C07F17/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A process for preparing a zirconium halohydride having the structural formula ##STR6## wherein each R is a π-cyclopentadienyl radical, which process comprises reacting a zirconium dihalide having the structural formula ##STR7## wherein each R has the aforedescribed significance with molecular hydrogen in the presence of an unreacted metal from Group Ia of the Periodic Table of the Elements in a solvent for the dihalide that does not prevent formation of said halohydride and at a temperature below that at which the halohydride decomposes.
Claim 2
Dependent Claim
83 words
A process for preparing a zirconium halohydride having the structural formula ##STR6## wherein each R is a π-cyclopentadienyl radical, which process comprises reacting a zirconium dihalide having the structural formula ##STR7## wherein each R has the aforedescribed significance with molecular hydrogen in the presence of an unreacted metal from Group Ia of the Periodic Table of the Elements in a solvent for the dihalide that does not prevent formation of said halohydride and at a temperature below that at which the halohydride decomposes.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the unreacted metal is sodium or potassium.
Claim 4
Dependent Claim
17 words
The process of claim 1 carried out in an ethereal or aromatic hydrocarbon solvent for the dihalide.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein each R is an unsubstituted π-cyclopentadienyl or a pentamethyl-π-cyclopentadienyl radical.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the halogen is chlorine.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the unreacted metal is sodium or potassium.
Claim 8
Dependent Claim
17 words
The process of claim 5 carried out in an ethereal or aromatic hydrocarbon solvent for the dihalide.
Claim 9
Dependent Claim
13 words
The process of claim 5 wherein each R is an unsubstituted π-cyclopentadienyl radical.
Claim 10
Dependent Claim
45 words
The process of claim 8 wherein the unreacted metal is sodium, the temperature is between about 0° and about 150° C. and the solvent is selected from the group consisting of dioxane, tetrahydropyran, tetrahydrofuran, diethyl ether, ethylene glycol dimethyl ether, benzene, toluene and the xylenes.
Claim 11
Dependent Claim
36 words
The process of claim 9 carried out under a molecular hydrogen pressure between about 1 and about 35 atmospheres and wherein the solvent is tetrahydrofuran and the temperature is between about 25° and about 140° C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |