Patent US2196346A successfully refreshed from Google Patents.
Patent US4086282A successfully refreshed from Google Patents.
US4086282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of 3,5-xylenol
Assignee: Shell USA Inc
•
Filing: 1976-04-29
•
Granted: 1978-04-25
•
Expires: 1996-04-29
Abstract
Abstract 3,5-Xylenol is prepared in high yield from isophorone by heating isophorone at a temperature of from about 450° to about 650° in the presence of a halogen having an atomic number of at least 17 or an organic compound containing such a halogen.
Inventors
- 👤 Freddy Wattimena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:38
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A process for the preparation of 3,5-xylenol from isophorone which comprises heating isophorone at a temperature of from about 450° to about 650° C in the presence of a homogeneous catalyst selected from the class consisting of a halogen having an atomic number of at least 17 and an organic compound containing said halogen, said halogen being selected from the class consisting of molecular chlorine, bromine and iodine and said organic compound being selected from the class consisting of haloalkanes of 1 to 6 carbon atoms allyl halides and phenyl halides.
Claim 2
Dependent Claim
91 words
A process for the preparation of 3,5-xylenol from isophorone which comprises heating isophorone at a temperature of from about 450° to about 650° C in the presence of a homogeneous catalyst selected from the class consisting of a halogen having an atomic number of at least 17 and an organic compound containing said halogen, said halogen being selected from the class consisting of molecular chlorine, bromine and iodine and said organic compound being selected from the class consisting of haloalkanes of 1 to 6 carbon atoms allyl halides and phenyl halides.
Claim 3
Dependent Claim
13 words
The process according to claim 1, wherein the catalyst is a phenyl halide.
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein the catalyst is an iodine-containing compound.
Claim 5
Dependent Claim
12 words
The process according to claim 2, wherein the catalyst is phenyl iodide.
Claim 6
Dependent Claim
12 words
The process according to claim 5, wherein the catalyst is methyl iodide.
Claim 7
Dependent Claim
25 words
The process according to claim 1, wherein the amount of catalyst used is from 0.1 to 5% by weight based on the weight of isophorone.
Claim 8
Dependent Claim
15 words
The process according to claim 6 wherein the temperature is from 550° to 650° C.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |