US5359105A
Expired / Lapsed
US
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Deprotonation of cyclopentadienyl derivatives
Assignee: Albemarle Corp
•
Filing: 1993-11-01
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Granted: 1994-10-25
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Expires: 2013-11-01
Abstract
Abstract Cyclopentadienyl derivatives are deprotonated by a process whereby the cyclopentadienyl derivatives are reacted with a Grignard reagent in an inert solvent which contains from about 0.5 to 1.5 equivalents per equivalent of cyclopentadienyl derivative of a cyclic ether or an acyclic polyether, so as to form a dianionic salt of said cyclopentadienyl derivative.
Inventors
- 👤 Jamie R. Strickler
- 👤 John M. Power
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:36
CPC Classifications
C; C07; C07F; C07F3/00; C07F3/02; C07F17/00; C07F7/00; C07F7/02; C07F7/08; C07F7/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A process for the deprotonation of a cyclopentadienyl derivative, said process comprising reacting a Grignard reagent with said cyclopentadienyl derivative in an inert solvent which contains from about 0.5 to 1.5 equivalents per equivalent of said cyclopentadiene derivative of an ether selected from the group consisting of cyclic ethers and acyclic polyethers so as to form a dianionic magnesium halide salt of said cyclopentadiene derivative.
Claim 2
Dependent Claim
65 words
A process for the deprotonation of a cyclopentadienyl derivative, said process comprising reacting a Grignard reagent with said cyclopentadienyl derivative in an inert solvent which contains from about 0.5 to 1.5 equivalents per equivalent of said cyclopentadiene derivative of an ether selected from the group consisting of cyclic ethers and acyclic polyethers so as to form a dianionic magnesium halide salt of said cyclopentadiene derivative.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein from about 0.5 to 1.0 equivalent per equivalent of said cyclopentadiene derivative of said ether is present and said ether is tetrahydrofuran.
Claim 4
Dependent Claim
65 words
The process of claim 1 wherein said cyclopentadienyl derivative has the formula Cp'YZH wherein Cp' is a cyclopentadienyl or a substituted cyclopentadienyl group, Y is a covalent bridging group which contains one or more Group 14 elements, and ZH is a heteroatom ligand of a Group 16 element having a coordination number of 2 or a Group 15 element having a coordination number of 3.
Claim 5
Dependent Claim
28 words
The process of claim 3 wherein from about 0.5 to 1.0 equivalent per equivalent of said cyclopentadiene derivative of said ether is present and said ether is tetrahydrofuran.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein said Grignard reagent is added to a solution of said cyclopentadiene derivative in an inert solvent which contains said ether.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein from about 0.5 to 1.0 equivalent of ether per equivalent of cyclopentadiene derivative is present.
Claim 8
Dependent Claim
23 words
The process of claim 5 wherein from about 0.5 to less than 1.0 equivalent of ether per equivalent of cyclopentadiene derivative is present.
Claim 9
Dependent Claim
43 words
The process of claim 5 wherein said ether is tetrahydrofuran, said cyclopentadiene derivative is (C 5 Me 4 H)SiMe 2 (NH-t-Bu) and said dianionic salt of said cyclopentadienyl derivative is (MgX) 2 [(C 5 Me 4 )SiMe 2 (N-t-Bu].THF where X is halogen.
Claim 10
Dependent Claim
27 words
The process of claim 3 wherein ZH is a heteroatom ligand of one or more elements selected from the group consisting of oxygen, nitrogen, phosphorus and sulfur.
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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) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |