US3997579A
Expired / Lapsed
US
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Selected phosphorus complexes of zerovalent iron
Assignee: EIDP Inc
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Filing: 1975-10-15
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Granted: 1976-12-14
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Expires: 1995-10-15
Abstract
Abstract Selected novel phosphorus complexes of zerovalent iron containing phosphite ester ligands and, optionally diphosphine ligands, e.g., pentakis(trimethyl phosphite iron) and bis[ethylenebis(diphenylphosphine)] (trimethyl phosphite) iron, are disclosed. The compounds are prepared by various methods, by cocondensation of the vapors of iron and the ligand compound on a cold surface, e.g., Fe + 5L → FeL.sub.5, by displacement reaction of the ligand with bis(cyclooctadiene)iron, by "wet-reduction" methods (preferred), e.g., FeBr.sub.2 + 5L Na.sub.x Hg.sub.y → FeL.sub.5 + 2NaBr, and, where two diphosphines are desired, by displacement of ethylenes, e.g., Fe(ethylene)(diphosphine).sub.2 + L → FeL(diphosphine).sub.2 + ethylene. The new compounds are useful as catalysts for the hydrocyanation of ethylene.
Inventors
- 👤 James Peter Jesson
- 👤 Chadwick Alma Tolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:58
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657109; C07F9/657145; C07F15/00; C07F15/02; C07F15/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
A compound of the formula ##STR8## wherein: the R 1 's are lower alkyl, chloro(lower alkyl), or oxa(lower alkyl) in which any chain branching or chloro substitution occurs at carbon removed from the oxygen by at least two other carbons, and may be the same or different; R 2 is lower alkyl; the R 3 's which may be the same or different, are primary or secondary lower alkyl, phenyl, 2-naphthyl, alkylphenyl of 7-10 carbons in which the alkyl group or groups are meta or para, phenylalkyl of 7-10 carbons in which the alkyl carbon bonded to phenyl bears at least one hydrogen, or alkylphenylalkyl of 8-10 carbons in which the carbon of the second-named alkyl moiety bonded to phenyl bears at least one hydrogen; n is 1, 2, or 3; a is 0-5; b is 0-5; c is 0, 1, or 2; and a + b + 2c = 5.
Claim 2
Dependent Claim
151 words
A compound of the formula ##STR8## wherein: the R 1 's are lower alkyl, chloro(lower alkyl), or oxa(lower alkyl) in which any chain branching or chloro substitution occurs at carbon removed from the oxygen by at least two other carbons, and may be the same or different; R 2 is lower alkyl; the R 3 's which may be the same or different, are primary or secondary lower alkyl, phenyl, 2-naphthyl, alkylphenyl of 7-10 carbons in which the alkyl group or groups are meta or para, phenylalkyl of 7-10 carbons in which the alkyl carbon bonded to phenyl bears at least one hydrogen, or alkylphenylalkyl of 8-10 carbons in which the carbon of the second-named alkyl moiety bonded to phenyl bears at least one hydrogen; n is 1, 2, or 3; a is 0-5; b is 0-5; c is 0, 1, or 2; and a + b + 2c = 5.
Claim 3
Dependent Claim
9 words
A compound of claim 1 wherein c is o.
Claim 4
Dependent Claim
7 words
The compound of claim 1, pentakis(trimethyl phosphite)iron.
Claim 5
Dependent Claim
7 words
The compound of claim 1, pentakis(triethyl phosphite)iron.
Claim 6
Dependent Claim
7 words
The compound of claim 1, pentakis(butylidynetrimethyl phosphite)iron.
Claim 7
Dependent Claim
7 words
The compound of claim 1, pentakis(propylidynetrimethyl phosphite)iron.
Claim 8
Dependent Claim
7 words
The compound of claim 1, bis[ethylenebis(diphenylphosphine)](trimethyl phosphite)iron.
Claim 9
Dependent Claim
8 words
The compound of claim 1, bis(propylidynetrimethyl phosphite)tris(triethyl phosphite)iron.
Claim 10
Dependent Claim
8 words
The compound of claim 1, (propylidynetrimethyl phosphite)tetrakis(triethyl phosphite)iron.
Claim 11
Dependent Claim
7 words
The compound of claim 1, pentakis(tripropyl phosphite)iron.
Claim 12
Dependent Claim
7 words
The compound of claim 1, bis[ethylenebis(diphenylphosphine)](propylidynetrimethyl phosphite)iron.
Claim 13
Dependent Claim
7 words
The compound of claim 1, [methylenebis(diphenylphosphine)]tris(trimethyl phosphite)iron.
References Cited (Backward Citations)
US3450732A
Cited
US3903120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |